From c4caeb8ffb8ee473244f278d61ee3a8ba844b5c6 Mon Sep 17 00:00:00 2001
From: Vishal Rana <vr@labstack.com>
Date: Sat, 19 Mar 2016 15:47:20 -0700
Subject: [PATCH] more godoc

Signed-off-by: Vishal Rana <vr@labstack.com>
---
 context.go                  | 107 ++++++++++++++-------
 context_test.go             |   4 +-
 echo.go                     | 179 ++++++++++++++++++++++++------------
 engine/engine.go            |   7 +-
 engine/fasthttp/header.go   |  20 ++--
 engine/fasthttp/request.go  |  28 +++---
 engine/fasthttp/response.go |  16 ++--
 engine/fasthttp/server.go   |   6 +-
 engine/fasthttp/url.go      |   8 +-
 engine/standard/header.go   |  10 +-
 engine/standard/request.go  |  28 +++---
 engine/standard/response.go |  22 ++---
 engine/standard/server.go   |   6 +-
 engine/standard/url.go      |   8 +-
 group.go                    |  17 +++-
 middleware/auth.go          |   7 +-
 middleware/compress.go      |  10 +-
 middleware/logger.go        |  28 +++++-
 middleware/recover.go       |  18 +++-
 middleware/static.go        |  18 +++-
 router.go                   |  14 +++
 21 files changed, 372 insertions(+), 189 deletions(-)

diff --git a/context.go b/context.go
index 31df4c56..78eb197a 100644
--- a/context.go
+++ b/context.go
@@ -22,40 +22,108 @@ import (
 )
 
 type (
-	// Context represents context for the current request. It holds request and
-	// response objects, path parameters, data and registered handler.
+	// Context represents the context of the current HTTP request. It holds request and
+	// response objects, path, path parameters, data and registered handler.
 	Context interface {
 		netContext.Context
+
+		// NetContext returns `http://blog.golang.org/context.Context` interface.
 		NetContext() netContext.Context
+
+		// SetNetContext sets `http://blog.golang.org/context.Context` interface.
 		SetNetContext(netContext.Context)
+
+		// Request returns `engine.Request` interface.
 		Request() engine.Request
+
+		// Request returns `engine.Response` interface.
 		Response() engine.Response
+
+		// Path returns the registered path for the handler.
 		Path() string
+
+		// P returns path parameter by index.
 		P(int) string
+
+		// Param returns path parameter by name.
 		Param(string) string
+
+		// ParamNames returns path parameter names.
 		ParamNames() []string
+
+		// Query returns query parameter by name.
 		Query(string) string
+
+		// Form returns form parameter by name.
 		Form(string) string
+
+		// Get retrieves data from the context.
 		Get(string) interface{}
+
+		// Set saves data in the context.
 		Set(string, interface{})
+
+		// Bind binds the request body into provided type `i`. The default binder does
+		// it based on Content-Type header.
 		Bind(interface{}) error
+
+		// Render renders a template with data and sends a text/html response with status
+		// code. Templates can be registered using `Echo.SetRenderer()`.
 		Render(int, string, interface{}) error
+
+		// HTML sends an HTTP response with status code.
 		HTML(int, string) error
+
+		// String sends a string response with status code.
 		String(int, string) error
+
+		// JSON sends a JSON response with status code.
 		JSON(int, interface{}) error
+
+		// JSONBlob sends a JSON blob response with status code.
 		JSONBlob(int, []byte) error
+
+		// JSONP sends a JSONP response with status code. It uses `callback` to construct
+		// the JSONP payload.
 		JSONP(int, string, interface{}) error
+
+		// XML sends an XML response with status code.
 		XML(int, interface{}) error
+
+		// XMLBlob sends a XML blob response with status code.
 		XMLBlob(int, []byte) error
+
+		// File sends a response with the content of the file.
 		File(string) error
+
+		// Attachment sends a response from `io.Reader` as attachment, prompting client
+		// to save the file.
 		Attachment(io.Reader, string) error
+
+		// NoContent sends a response with no body and a status code.
 		NoContent(int) error
+
+		// Redirect redirects the request with status code.
 		Redirect(int, string) error
+
+		// Error invokes the registered HTTP error handler. Generally used by middleware.
 		Error(err error)
+
+		// Handler implements `Handler` interface.
 		Handle(Context) error
+
+		// Logger returns the `Logger` instance.
 		Logger() *log.Logger
+
+		// Echo returns the `Echo` instance.
 		Echo() *Echo
+
+		// Object returns the `context` instance.
 		Object() *context
+
+		// Reset resets the context after request completes. It must be called along
+		// with `Echo#GetContext()` and `Echo#PutContext()`. See `Echo#ServeHTTP()`
+		Reset(engine.Request, engine.Response)
 	}
 
 	context struct {
@@ -118,22 +186,18 @@ func (c *context) Handle(ctx Context) error {
 	return c.handler.Handle(ctx)
 }
 
-// Request returns *http.Request.
 func (c *context) Request() engine.Request {
 	return c.request
 }
 
-// Response returns `engine.Response`.
 func (c *context) Response() engine.Response {
 	return c.response
 }
 
-// Path returns the registered path for the handler.
 func (c *context) Path() string {
 	return c.path
 }
 
-// P returns path parameter by index.
 func (c *context) P(i int) (value string) {
 	l := len(c.pnames)
 	if i < l {
@@ -142,7 +206,6 @@ func (c *context) P(i int) (value string) {
 	return
 }
 
-// Param returns path parameter by name.
 func (c *context) Param(name string) (value string) {
 	l := len(c.pnames)
 	for i, n := range c.pnames {
@@ -154,22 +217,18 @@ func (c *context) Param(name string) (value string) {
 	return
 }
 
-// ParamNames returns path parameter names.
 func (c *context) ParamNames() []string {
 	return c.pnames
 }
 
-// Query returns query parameter by name.
 func (c *context) Query(name string) string {
 	return c.request.URL().QueryValue(name)
 }
 
-// Form returns form parameter by name.
 func (c *context) Form(name string) string {
 	return c.request.FormValue(name)
 }
 
-// Set saves data in the context.
 func (c *context) Set(key string, val interface{}) {
 	if c.store == nil {
 		c.store = make(store)
@@ -177,19 +236,14 @@ func (c *context) Set(key string, val interface{}) {
 	c.store[key] = val
 }
 
-// Get retrieves data from the context.
 func (c *context) Get(key string) interface{} {
 	return c.store[key]
 }
 
-// Bind binds the request body into provided type `i`. The default binder does
-// it based on Content-Type header.
 func (c *context) Bind(i interface{}) error {
 	return c.echo.binder.Bind(i, c)
 }
 
-// Render renders a template with data and sends a text/html response with status
-// code. Templates can be registered using `Echo.SetRenderer()`.
 func (c *context) Render(code int, name string, data interface{}) (err error) {
 	if c.echo.renderer == nil {
 		return ErrRendererNotRegistered
@@ -204,7 +258,6 @@ func (c *context) Render(code int, name string, data interface{}) (err error) {
 	return
 }
 
-// HTML sends an HTTP response with status code.
 func (c *context) HTML(code int, html string) (err error) {
 	c.response.Header().Set(ContentType, TextHTMLCharsetUTF8)
 	c.response.WriteHeader(code)
@@ -212,7 +265,6 @@ func (c *context) HTML(code int, html string) (err error) {
 	return
 }
 
-// String sends a string response with status code.
 func (c *context) String(code int, s string) (err error) {
 	c.response.Header().Set(ContentType, TextPlainCharsetUTF8)
 	c.response.WriteHeader(code)
@@ -220,7 +272,6 @@ func (c *context) String(code int, s string) (err error) {
 	return
 }
 
-// JSON sends a JSON response with status code.
 func (c *context) JSON(code int, i interface{}) (err error) {
 	b, err := json.Marshal(i)
 	if c.echo.Debug() {
@@ -232,7 +283,6 @@ func (c *context) JSON(code int, i interface{}) (err error) {
 	return c.JSONBlob(code, b)
 }
 
-// JSONBlob sends a JSON blob response with status code.
 func (c *context) JSONBlob(code int, b []byte) (err error) {
 	c.response.Header().Set(ContentType, ApplicationJSONCharsetUTF8)
 	c.response.WriteHeader(code)
@@ -240,8 +290,6 @@ func (c *context) JSONBlob(code int, b []byte) (err error) {
 	return
 }
 
-// JSONP sends a JSONP response with status code. It uses `callback` to construct
-// the JSONP payload.
 func (c *context) JSONP(code int, callback string, i interface{}) (err error) {
 	b, err := json.Marshal(i)
 	if err != nil {
@@ -259,7 +307,6 @@ func (c *context) JSONP(code int, callback string, i interface{}) (err error) {
 	return
 }
 
-// XML sends an XML response with status code.
 func (c *context) XML(code int, i interface{}) (err error) {
 	b, err := xml.Marshal(i)
 	if c.echo.Debug() {
@@ -271,7 +318,6 @@ func (c *context) XML(code int, i interface{}) (err error) {
 	return c.XMLBlob(code, b)
 }
 
-// XMLBlob sends a XML blob response with status code.
 func (c *context) XMLBlob(code int, b []byte) (err error) {
 	c.response.Header().Set(ContentType, ApplicationXMLCharsetUTF8)
 	c.response.WriteHeader(code)
@@ -282,7 +328,6 @@ func (c *context) XMLBlob(code int, b []byte) (err error) {
 	return
 }
 
-// File sends a response with the content of the file.
 func (c *context) File(file string) error {
 	root, file := filepath.Split(file)
 	fs := http.Dir(root)
@@ -305,8 +350,6 @@ func (c *context) File(file string) error {
 	return ServeContent(c.Request(), c.Response(), f, fi)
 }
 
-// Attachment sends a response from `io.Reader` as attachment, prompting client
-// to save the file.
 func (c *context) Attachment(r io.Reader, name string) (err error) {
 	c.response.Header().Set(ContentType, detectContentType(name))
 	c.response.Header().Set(ContentDisposition, "attachment; filename="+name)
@@ -315,13 +358,11 @@ func (c *context) Attachment(r io.Reader, name string) (err error) {
 	return
 }
 
-// NoContent sends a response with no body and a status code.
 func (c *context) NoContent(code int) error {
 	c.response.WriteHeader(code)
 	return nil
 }
 
-// Redirect redirects the request with status code.
 func (c *context) Redirect(code int, url string) error {
 	if code < http.StatusMultipleChoices || code > http.StatusTemporaryRedirect {
 		return ErrInvalidRedirectCode
@@ -331,26 +372,24 @@ func (c *context) Redirect(code int, url string) error {
 	return nil
 }
 
-// Error invokes the registered HTTP error handler. Generally used by middleware.
 func (c *context) Error(err error) {
 	c.echo.httpErrorHandler(err, c)
 }
 
-// Echo returns the `Echo` instance.
 func (c *context) Echo() *Echo {
 	return c.echo
 }
 
-// Logger returns the `Logger` instance.
 func (c *context) Logger() *log.Logger {
 	return c.echo.logger
 }
 
-// Object returns the `context` object.
 func (c *context) Object() *context {
 	return c
 }
 
+// ServeContent sends a response from `io.Reader`. It automatically sets the `Content-Type`
+// and `Last-Modified` headers.
 func ServeContent(req engine.Request, res engine.Response, f http.File, fi os.FileInfo) error {
 	res.Header().Set(ContentType, detectContentType(fi.Name()))
 	res.Header().Set(LastModified, fi.ModTime().UTC().Format(http.TimeFormat))
@@ -366,7 +405,7 @@ func detectContentType(name string) (t string) {
 	return
 }
 
-func (c *context) reset(req engine.Request, res engine.Response) {
+func (c *context) Reset(req engine.Request, res engine.Response) {
 	c.netContext = nil
 	c.request = req
 	c.response = res
diff --git a/context_test.go b/context_test.go
index 4aee5342..1c4f7ed8 100644
--- a/context_test.go
+++ b/context_test.go
@@ -191,8 +191,8 @@ func TestContext(t *testing.T) {
 	c.Error(errors.New("error"))
 	assert.Equal(t, http.StatusInternalServerError, rec.Status())
 
-	// reset
-	c.Object().reset(req, test.NewResponseRecorder())
+	// Reset
+	c.Object().Reset(req, test.NewResponseRecorder())
 }
 
 func TestContextPath(t *testing.T) {
diff --git a/echo.go b/echo.go
index 128ae1c3..ec7d04a5 100644
--- a/echo.go
+++ b/echo.go
@@ -1,3 +1,42 @@
+/*
+Package echo implements a fast and unfancy micro web framework for Go.
+
+Example:
+
+	package main
+
+	import (
+	    "net/http"
+
+	    "github.com/labstack/echo"
+	    "github.com/labstack/echo/engine/standard"
+	    "github.com/labstack/echo/middleware"
+	)
+
+	// Handler
+	func hello() echo.HandlerFunc {
+	    return func(c echo.Context) error {
+	        return c.String(http.StatusOK, "Hello, World!\n")
+	    }
+	}
+
+	func main() {
+	    // Echo instance
+	    e := echo.New()
+
+	    // Middleware
+	    e.Use(middleware.Logger())
+	    e.Use(middleware.Recover())
+
+	    // Routes
+	    e.Get("/", hello())
+
+	    // Start server
+	    e.Run(standard.New(":1323"))
+	}
+
+Learn more at https://labstack.com/echo
+*/
 package echo
 
 import (
@@ -20,6 +59,7 @@ import (
 )
 
 type (
+	// Echo is the top-level framework instance.
 	Echo struct {
 		prefix           string
 		middleware       []Middleware
@@ -36,33 +76,43 @@ type (
 		logger           *log.Logger
 	}
 
+	// Route contains a handler and information for matching against requests.
 	Route struct {
 		Method  string
 		Path    string
 		Handler string
 	}
 
+	// HTTPError represents an error that occured while handling a request.
 	HTTPError struct {
 		Code    int
 		Message string
 	}
 
+	// Middleware defines an interface for middleware via `Handle(Handler) Handler`
+	// function.
 	Middleware interface {
 		Handle(Handler) Handler
 	}
 
+	// MiddlewareFunc is an adapter to allow the use of `func(Handler) Handler` as
+	// middleware.
 	MiddlewareFunc func(Handler) Handler
 
+	// Handler defines an interface to server HTTP requests via `Handle(Context)`
+	// function.
 	Handler interface {
 		Handle(Context) error
 	}
 
+	// HandlerFunc is an adapter to allow the use of `func(Context)` as an HTTP
+	// handler.
 	HandlerFunc func(Context) error
 
 	// HTTPErrorHandler is a centralized HTTP error handler.
 	HTTPErrorHandler func(error, Context)
 
-	// Binder is the interface that wraps the Bind method.
+	// Binder is the interface that wraps the Bind function.
 	Binder interface {
 		Bind(interface{}, Context) error
 	}
@@ -70,41 +120,36 @@ type (
 	binder struct {
 	}
 
-	// Validator is the interface that wraps the Validate method.
+	// Validator is the interface that wraps the Validate function.
 	Validator interface {
 		Validate() error
 	}
 
-	// Renderer is the interface that wraps the Render method.
+	// Renderer is the interface that wraps the Render function.
 	Renderer interface {
 		Render(io.Writer, string, interface{}, Context) error
 	}
 )
 
+//--------------
+// HTTP methods
+//--------------
 const (
-	// CONNECT HTTP method
 	CONNECT = "CONNECT"
-	// DELETE HTTP method
-	DELETE = "DELETE"
-	// GET HTTP method
-	GET = "GET"
-	// HEAD HTTP method
-	HEAD = "HEAD"
-	// OPTIONS HTTP method
+	DELETE  = "DELETE"
+	GET     = "GET"
+	HEAD    = "HEAD"
 	OPTIONS = "OPTIONS"
-	// PATCH HTTP method
-	PATCH = "PATCH"
-	// POST HTTP method
-	POST = "POST"
-	// PUT HTTP method
-	PUT = "PUT"
-	// TRACE HTTP method
-	TRACE = "TRACE"
-
-	//-------------
-	// Media types
-	//-------------
+	PATCH   = "PATCH"
+	POST    = "POST"
+	PUT     = "PUT"
+	TRACE   = "TRACE"
+)
 
+//-------------
+// Media types
+//-------------
+const (
 	ApplicationJSON                  = "application/json"
 	ApplicationJSONCharsetUTF8       = ApplicationJSON + "; " + CharsetUTF8
 	ApplicationJavaScript            = "application/javascript"
@@ -120,17 +165,19 @@ const (
 	TextPlainCharsetUTF8             = TextPlain + "; " + CharsetUTF8
 	MultipartForm                    = "multipart/form-data"
 	OctetStream                      = "application/octet-stream"
+)
 
-	//---------
-	// Charset
-	//---------
-
+//---------
+// Charset
+//---------
+const (
 	CharsetUTF8 = "charset=utf-8"
+)
 
-	//---------
-	// Headers
-	//---------
-
+//---------
+// Headers
+//---------
+const (
 	AcceptEncoding     = "Accept-Encoding"
 	Authorization      = "Authorization"
 	ContentDisposition = "Content-Disposition"
@@ -158,22 +205,24 @@ var (
 		PUT,
 		TRACE,
 	}
+)
 
-	//--------
-	// Errors
-	//--------
-
+//--------
+// Errors
+//--------
+var (
 	ErrUnsupportedMediaType  = NewHTTPError(http.StatusUnsupportedMediaType)
 	ErrNotFound              = NewHTTPError(http.StatusNotFound)
 	ErrUnauthorized          = NewHTTPError(http.StatusUnauthorized)
 	ErrMethodNotAllowed      = NewHTTPError(http.StatusMethodNotAllowed)
 	ErrRendererNotRegistered = errors.New("renderer not registered")
 	ErrInvalidRedirectCode   = errors.New("invalid redirect status code")
+)
 
-	//----------------
-	// Error handlers
-	//----------------
-
+//----------------
+// Error handlers
+//----------------
+var (
 	notFoundHandler = HandlerFunc(func(c Context) error {
 		return ErrNotFound
 	})
@@ -206,12 +255,14 @@ func New() (e *Echo) {
 	return
 }
 
-func (m MiddlewareFunc) Handle(h Handler) Handler {
-	return m(h)
+// Handle chains middleware.
+func (f MiddlewareFunc) Handle(h Handler) Handler {
+	return f(h)
 }
 
-func (h HandlerFunc) Handle(c Context) error {
-	return h(c)
+// Handle serves HTTP request.
+func (f HandlerFunc) Handle(c Context) error {
+	return f(c)
 }
 
 // Router returns router.
@@ -261,12 +312,12 @@ func (e *Echo) SetHTTPErrorHandler(h HTTPErrorHandler) {
 	e.httpErrorHandler = h
 }
 
-// SetBinder registers a custom binder. It's invoked by Context.Bind().
+// SetBinder registers a custom binder. It's invoked by `Context#Bind()`.
 func (e *Echo) SetBinder(b Binder) {
 	e.binder = b
 }
 
-// SetRenderer registers an HTML template renderer. It's invoked by Context.Render().
+// SetRenderer registers an HTML template renderer. It's invoked by `Context#Render()`.
 func (e *Echo) SetRenderer(r Renderer) {
 	e.renderer = r
 }
@@ -301,59 +352,70 @@ func (e *Echo) chainMiddleware() {
 	}
 }
 
-// Connect adds a CONNECT route > handler to the router.
+// Connect registers a new CONNECT route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Connect(path string, h Handler, m ...Middleware) {
 	e.add(CONNECT, path, h, m...)
 }
 
-// Delete adds a DELETE route > handler to the router.
+// Delete registers a new DELETE route for a path with matching handler in the router
+// with optional route-level middleware.
 func (e *Echo) Delete(path string, h Handler, m ...Middleware) {
 	e.add(DELETE, path, h, m...)
 }
 
-// Get adds a GET route > handler to the router.
+// Get registers a new GET route for a path with matching handler in the router
+// with optional route-level middleware.
 func (e *Echo) Get(path string, h Handler, m ...Middleware) {
 	e.add(GET, path, h, m...)
 }
 
-// Head adds a HEAD route > handler to the router.
+// Head registers a new HEAD route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Head(path string, h Handler, m ...Middleware) {
 	e.add(HEAD, path, h, m...)
 }
 
-// Options adds an OPTIONS route > handler to the router.
+// Options registers a new OPTIONS route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Options(path string, h Handler, m ...Middleware) {
 	e.add(OPTIONS, path, h, m...)
 }
 
-// Patch adds a PATCH route > handler to the router.
+// Patch registers a new PATCH route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Patch(path string, h Handler, m ...Middleware) {
 	e.add(PATCH, path, h, m...)
 }
 
-// Post adds a POST route > handler to the router.
+// Post registers a new POST route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Post(path string, h Handler, m ...Middleware) {
 	e.add(POST, path, h, m...)
 }
 
-// Put adds a PUT route > handler to the router.
+// Put registers a new PUT route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Put(path string, h Handler, m ...Middleware) {
 	e.add(PUT, path, h, m...)
 }
 
-// Trace adds a TRACE route > handler to the router.
+// Trace registers a new TRACE route for a path with matching handler in the
+// router with optional route-level middleware.
 func (e *Echo) Trace(path string, h Handler, m ...Middleware) {
 	e.add(TRACE, path, h, m...)
 }
 
-// Any adds a route > handler to the router for all HTTP methods.
+// Any registers a new route for all HTTP methods and path with matching handler
+// in the router with optional route-level middleware.
 func (e *Echo) Any(path string, handler Handler, middleware ...Middleware) {
 	for _, m := range methods {
 		e.add(m, path, handler, middleware...)
 	}
 }
 
-// Match adds a route > handler to the router for multiple HTTP methods provided.
+// Match registers a new route for multiple HTTP methods and path with matching
+// handler in the router with optional route-level middleware.
 func (e *Echo) Match(methods []string, path string, handler Handler, middleware ...Middleware) {
 	for _, m := range methods {
 		e.add(m, path, handler, middleware...)
@@ -392,7 +454,7 @@ func (e *Echo) add(method, path string, handler Handler, middleware ...Middlewar
 	e.router.routes = append(e.router.routes, r)
 }
 
-// Group creates a new router group with prefix.
+// Group creates a new router group with prefix and optional group-level middleware.
 func (e *Echo) Group(prefix string, m ...Middleware) (g *Group) {
 	g = &Group{prefix: prefix, echo: e}
 	g.Use(m...)
@@ -448,7 +510,7 @@ func (e *Echo) PutContext(c Context) {
 
 func (e *Echo) ServeHTTP(req engine.Request, res engine.Response) {
 	c := e.pool.Get().(*context)
-	c.reset(req, res)
+	c.Reset(req, res)
 
 	// Execute chain
 	if err := e.head.Handle(c); err != nil {
@@ -465,6 +527,7 @@ func (e *Echo) Run(s engine.Server) error {
 	return s.Start()
 }
 
+// NewHTTPError creates a new HTTPError instance.
 func NewHTTPError(code int, msg ...string) *HTTPError {
 	he := &HTTPError{Code: code, Message: http.StatusText(code)}
 	if len(msg) > 0 {
diff --git a/engine/engine.go b/engine/engine.go
index 35d5548c..a5526030 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -54,7 +54,7 @@ type (
 		// RemoteAddress returns the client's network address.
 		RemoteAddress() string
 
-		// Method returns the request's HTTP method.
+		// Method returns the request's HTTP function.
 		Method() string
 
 		// SetMethod sets the HTTP method of the request.
@@ -136,7 +136,7 @@ type (
 		QueryString() string
 	}
 
-	// Config defines engine configuration.
+	// Config defines engine config.
 	Config struct {
 		Address      string        // TCP address to listen on.
 		Listener     net.Listener  // Custom `net.Listener`. If set, server accepts connections on it.
@@ -152,7 +152,8 @@ type (
 		ServeHTTP(Request, Response)
 	}
 
-	// HandlerFunc is an adapter to allow the use of `func(Request, Response)` as HTTP handlers.
+	// HandlerFunc is an adapter to allow the use of `func(Request, Response)` as
+	// an HTTP handler.
 	HandlerFunc func(Request, Response)
 )
 
diff --git a/engine/fasthttp/header.go b/engine/fasthttp/header.go
index e3dfdbc1..b6a13280 100644
--- a/engine/fasthttp/header.go
+++ b/engine/fasthttp/header.go
@@ -16,27 +16,27 @@ type (
 	}
 )
 
-// Add implements `engine.Header#Add` method.
+// Add implements `engine.Header#Add` function.
 func (h *RequestHeader) Add(key, val string) {
 	// h.RequestHeader.Add(key, val)
 }
 
-// Del implements `engine.Header#Del` method.
+// Del implements `engine.Header#Del` function.
 func (h *RequestHeader) Del(key string) {
 	h.RequestHeader.Del(key)
 }
 
-// Set implements `engine.Header#Set` method.
+// Set implements `engine.Header#Set` function.
 func (h *RequestHeader) Set(key, val string) {
 	h.RequestHeader.Set(key, val)
 }
 
-// Get implements `engine.Header#Get` method.
+// Get implements `engine.Header#Get` function.
 func (h *RequestHeader) Get(key string) string {
 	return string(h.Peek(key))
 }
 
-// Keys implements `engine.Header#Keys` method.
+// Keys implements `engine.Header#Keys` function.
 func (h *RequestHeader) Keys() (keys []string) {
 	keys = make([]string, h.Len())
 	i := 0
@@ -51,28 +51,28 @@ func (h *RequestHeader) reset(hdr *fasthttp.RequestHeader) {
 	h.RequestHeader = hdr
 }
 
-// Add implements `engine.Header#Add` method.
+// Add implements `engine.Header#Add` function.
 func (h *ResponseHeader) Add(key, val string) {
 	// TODO: https://github.com/valyala/fasthttp/issues/69
 	// h.header.Add(key, val)
 }
 
-// Del implements `engine.Header#Del` method.
+// Del implements `engine.Header#Del` function.
 func (h *ResponseHeader) Del(key string) {
 	h.ResponseHeader.Del(key)
 }
 
-// Get implements `engine.Header#Get` method.
+// Get implements `engine.Header#Get` function.
 func (h *ResponseHeader) Get(key string) string {
 	return string(h.Peek(key))
 }
 
-// Set implements `engine.Header#Set` method.
+// Set implements `engine.Header#Set` function.
 func (h *ResponseHeader) Set(key, val string) {
 	h.ResponseHeader.Set(key, val)
 }
 
-// Keys implements `engine.Header#Keys` method.
+// Keys implements `engine.Header#Keys` function.
 func (h *ResponseHeader) Keys() (keys []string) {
 	keys = make([]string, h.Len())
 	i := 0
diff --git a/engine/fasthttp/request.go b/engine/fasthttp/request.go
index cb4f6f40..0d95197b 100644
--- a/engine/fasthttp/request.go
+++ b/engine/fasthttp/request.go
@@ -22,72 +22,72 @@ type (
 	}
 )
 
-// TLS implements `engine.Request#TLS` method.
+// TLS implements `engine.Request#TLS` function.
 func (r *Request) TLS() bool {
 	return r.IsTLS()
 }
 
-// Scheme implements `engine.Request#Scheme` method.
+// Scheme implements `engine.Request#Scheme` function.
 func (r *Request) Scheme() string {
 	return string(r.RequestCtx.URI().Scheme())
 }
 
-// Host implements `engine.Request#Host` method.
+// Host implements `engine.Request#Host` function.
 func (r *Request) Host() string {
 	return string(r.RequestCtx.Host())
 }
 
-// URL implements `engine.Request#URL` method.
+// URL implements `engine.Request#URL` function.
 func (r *Request) URL() engine.URL {
 	return r.url
 }
 
-// Header implements `engine.Request#Header` method.
+// Header implements `engine.Request#Header` function.
 func (r *Request) Header() engine.Header {
 	return r.header
 }
 
-// UserAgent implements `engine.Request#UserAgent` method.
+// UserAgent implements `engine.Request#UserAgent` function.
 func (r *Request) UserAgent() string {
 	return string(r.RequestCtx.UserAgent())
 }
 
-// RemoteAddress implements `engine.Request#RemoteAddress` method.
+// RemoteAddress implements `engine.Request#RemoteAddress` function.
 func (r *Request) RemoteAddress() string {
 	return r.RemoteAddr().String()
 }
 
-// Method implements `engine.Request#Method` method.
+// Method implements `engine.Request#Method` function.
 func (r *Request) Method() string {
 	return string(r.RequestCtx.Method())
 }
 
-// SetMethod implements `engine.Request#SetMethod` method.
+// SetMethod implements `engine.Request#SetMethod` function.
 func (r *Request) SetMethod(method string) {
 	r.Request.Header.SetMethod(method)
 }
 
-// URI implements `engine.Request#URI` method.
+// URI implements `engine.Request#URI` function.
 func (r *Request) URI() string {
 	return string(r.RequestURI())
 }
 
-// Body implements `engine.Request#Body` method.
+// Body implements `engine.Request#Body` function.
 func (r *Request) Body() io.Reader {
 	return bytes.NewBuffer(r.PostBody())
 }
 
-// FormValue implements `engine.Request#FormValue` method.
+// FormValue implements `engine.Request#FormValue` function.
 func (r *Request) FormValue(name string) string {
 	return string(r.RequestCtx.FormValue(name))
 }
 
-// FormFile implements `engine.Request#FormFile` method.
+// FormFile implements `engine.Request#FormFile` function.
 func (r *Request) FormFile(name string) (*multipart.FileHeader, error) {
 	return r.RequestCtx.FormFile(name)
 }
 
-// MultipartForm implements `engine.Request#MultipartForm` method.
+// MultipartForm implements `engine.Request#MultipartForm` function.
 func (r *Request) MultipartForm() (*multipart.Form, error) {
 	return r.RequestCtx.MultipartForm()
 }
diff --git a/engine/fasthttp/response.go b/engine/fasthttp/response.go
index e56d0487..45643535 100644
--- a/engine/fasthttp/response.go
+++ b/engine/fasthttp/response.go
@@ -24,12 +24,12 @@ type (
 	}
 )
 
-// Header implements `engine.Response#Header` method.
+// Header implements `engine.Response#Header` function.
 func (r *Response) Header() engine.Header {
 	return r.header
 }
 
-// WriteHeader implements `engine.Response#WriteHeader` method.
+// WriteHeader implements `engine.Response#WriteHeader` function.
 func (r *Response) WriteHeader(code int) {
 	if r.committed {
 		r.logger.Warn("response already committed")
@@ -40,34 +40,34 @@ func (r *Response) WriteHeader(code int) {
 	r.committed = true
 }
 
-// Write implements `engine.Response#Write` method.
+// Write implements `engine.Response#Write` function.
 func (r *Response) Write(b []byte) (n int, err error) {
 	n, err = r.writer.Write(b)
 	r.size += int64(n)
 	return
 }
 
-// Status implements `engine.Response#Status` method.
+// Status implements `engine.Response#Status` function.
 func (r *Response) Status() int {
 	return r.status
 }
 
-// Size implements `engine.Response#Size` method.
+// Size implements `engine.Response#Size` function.
 func (r *Response) Size() int64 {
 	return r.size
 }
 
-// Committed implements `engine.Response#Committed` method.
+// Committed implements `engine.Response#Committed` function.
 func (r *Response) Committed() bool {
 	return r.committed
 }
 
-// Writer implements `engine.Response#Writer` method.
+// Writer implements `engine.Response#Writer` function.
 func (r *Response) Writer() io.Writer {
 	return r.writer
 }
 
-// SetWriter implements `engine.Response#SetWriter` method.
+// SetWriter implements `engine.Response#SetWriter` function.
 func (r *Response) SetWriter(w io.Writer) {
 	r.writer = w
 }
diff --git a/engine/fasthttp/server.go b/engine/fasthttp/server.go
index d6704e64..e6571404 100644
--- a/engine/fasthttp/server.go
+++ b/engine/fasthttp/server.go
@@ -87,17 +87,17 @@ func NewFromConfig(c engine.Config) (s *Server) {
 	return
 }
 
-// SetHandler implements `engine.Server#SetHandler` method.
+// SetHandler implements `engine.Server#SetHandler` function.
 func (s *Server) SetHandler(h engine.Handler) {
 	s.handler = h
 }
 
-// SetLogger implements `engine.Server#SetLogger` method.
+// SetLogger implements `engine.Server#SetLogger` function.
 func (s *Server) SetLogger(l *log.Logger) {
 	s.logger = l
 }
 
-// Start implements `engine.Server#Start` method.
+// Start implements `engine.Server#Start` function.
 func (s *Server) Start() error {
 	if s.config.Listener == nil {
 		return s.startDefaultListener()
diff --git a/engine/fasthttp/url.go b/engine/fasthttp/url.go
index 0cb16e03..75dbedad 100644
--- a/engine/fasthttp/url.go
+++ b/engine/fasthttp/url.go
@@ -11,22 +11,22 @@ type (
 	}
 )
 
-// Path implements `engine.URL#Path` method.
+// Path implements `engine.URL#Path` function.
 func (u *URL) Path() string {
 	return string(u.URI.Path())
 }
 
-// SetPath implements `engine.URL#SetPath` method.
+// SetPath implements `engine.URL#SetPath` function.
 func (u *URL) SetPath(path string) {
 	u.URI.SetPath(path)
 }
 
-// QueryValue implements `engine.URL#QueryValue` method.
+// QueryValue implements `engine.URL#QueryValue` function.
 func (u *URL) QueryValue(name string) string {
 	return string(u.QueryArgs().Peek(name))
 }
 
-// QueryString implements `engine.URL#QueryString` method.
+// QueryString implements `engine.URL#QueryString` function.
 func (u *URL) QueryString() string {
 	return string(u.URI.QueryString())
 }
diff --git a/engine/standard/header.go b/engine/standard/header.go
index 962094dd..01f0e83c 100644
--- a/engine/standard/header.go
+++ b/engine/standard/header.go
@@ -9,27 +9,27 @@ type (
 	}
 )
 
-// Add implements `engine.Header#Add` method.
+// Add implements `engine.Header#Add` function.
 func (h *Header) Add(key, val string) {
 	h.Header.Add(key, val)
 }
 
-// Del implements `engine.Header#Del` method.
+// Del implements `engine.Header#Del` function.
 func (h *Header) Del(key string) {
 	h.Header.Del(key)
 }
 
-// Set implements `engine.Header#Set` method.
+// Set implements `engine.Header#Set` function.
 func (h *Header) Set(key, val string) {
 	h.Header.Set(key, val)
 }
 
-// Get implements `engine.Header#Get` method.
+// Get implements `engine.Header#Get` function.
 func (h *Header) Get(key string) string {
 	return h.Header.Get(key)
 }
 
-// Keys implements `engine.Header#Keys` method.
+// Keys implements `engine.Header#Keys` function.
 func (h *Header) Keys() (keys []string) {
 	keys = make([]string, len(h.Header))
 	i := 0
diff --git a/engine/standard/request.go b/engine/standard/request.go
index 282ce063..bbab4b3f 100644
--- a/engine/standard/request.go
+++ b/engine/standard/request.go
@@ -17,12 +17,12 @@ type (
 	}
 )
 
-// TLS implements `engine.Request#TLS` method.
+// TLS implements `engine.Request#TLS` function.
 func (r *Request) TLS() bool {
 	return r.Request.TLS != nil
 }
 
-// Scheme implements `engine.Request#Scheme` method.
+// Scheme implements `engine.Request#Scheme` function.
 func (r *Request) Scheme() string {
 	if r.TLS() {
 		return "https"
@@ -30,17 +30,17 @@ func (r *Request) Scheme() string {
 	return "http"
 }
 
-// Host implements `engine.Request#Host` method.
+// Host implements `engine.Request#Host` function.
 func (r *Request) Host() string {
 	return r.Request.Host
 }
 
-// URL implements `engine.Request#URL` method.
+// URL implements `engine.Request#URL` function.
 func (r *Request) URL() engine.URL {
 	return r.url
 }
 
-// Header implements `engine.Request#URL` method.
+// Header implements `engine.Request#URL` function.
 func (r *Request) Header() engine.Header {
 	return r.header
 }
@@ -57,48 +57,48 @@ func (r *Request) Header() engine.Header {
 // 	return r.request.ProtoMinor()
 // }
 
-// UserAgent implements `engine.Request#UserAgent` method.
+// UserAgent implements `engine.Request#UserAgent` function.
 func (r *Request) UserAgent() string {
 	return r.Request.UserAgent()
 }
 
-// RemoteAddress implements `engine.Request#RemoteAddress` method.
+// RemoteAddress implements `engine.Request#RemoteAddress` function.
 func (r *Request) RemoteAddress() string {
 	return r.RemoteAddr
 }
 
-// Method implements `engine.Request#Method` method.
+// Method implements `engine.Request#Method` function.
 func (r *Request) Method() string {
 	return r.Request.Method
 }
 
-// SetMethod implements `engine.Request#SetMethod` method.
+// SetMethod implements `engine.Request#SetMethod` function.
 func (r *Request) SetMethod(method string) {
 	r.Request.Method = method
 }
 
-// URI implements `engine.Request#URI` method.
+// URI implements `engine.Request#URI` function.
 func (r *Request) URI() string {
 	return r.RequestURI
 }
 
-// Body implements `engine.Request#Body` method.
+// Body implements `engine.Request#Body` function.
 func (r *Request) Body() io.Reader {
 	return r.Request.Body
 }
 
-// FormValue implements `engine.Request#FormValue` method.
+// FormValue implements `engine.Request#FormValue` function.
 func (r *Request) FormValue(name string) string {
 	return r.Request.FormValue(name)
 }
 
-// FormFile implements `engine.Request#FormFile` method.
+// FormFile implements `engine.Request#FormFile` function.
 func (r *Request) FormFile(name string) (*multipart.FileHeader, error) {
 	_, fh, err := r.Request.FormFile(name)
 	return fh, err
 }
 
-// MultipartForm implements `engine.Request#MultipartForm` method.
+// MultipartForm implements `engine.Request#MultipartForm` function.
 func (r *Request) MultipartForm() (*multipart.Form, error) {
 	err := r.Request.ParseMultipartForm(32 << 20) // 32 MB
 	return r.Request.MultipartForm, err
diff --git a/engine/standard/response.go b/engine/standard/response.go
index ad0810f3..0a179136 100644
--- a/engine/standard/response.go
+++ b/engine/standard/response.go
@@ -28,12 +28,12 @@ type (
 	}
 )
 
-// Header implements `engine.Response#Header` method.
+// Header implements `engine.Response#Header` function.
 func (r *Response) Header() engine.Header {
 	return r.header
 }
 
-// WriteHeader implements `engine.Response#WriteHeader` method.
+// WriteHeader implements `engine.Response#WriteHeader` function.
 func (r *Response) WriteHeader(code int) {
 	if r.committed {
 		r.logger.Warn("response already committed")
@@ -44,48 +44,48 @@ func (r *Response) WriteHeader(code int) {
 	r.committed = true
 }
 
-// Write implements `engine.Response#Write` method.
+// Write implements `engine.Response#Write` function.
 func (r *Response) Write(b []byte) (n int, err error) {
 	n, err = r.writer.Write(b)
 	r.size += int64(n)
 	return
 }
 
-// Status implements `engine.Response#Status` method.
+// Status implements `engine.Response#Status` function.
 func (r *Response) Status() int {
 	return r.status
 }
 
-// Size implements `engine.Response#Size` method.
+// Size implements `engine.Response#Size` function.
 func (r *Response) Size() int64 {
 	return r.size
 }
 
-// Committed implements `engine.Response#Committed` method.
+// Committed implements `engine.Response#Committed` function.
 func (r *Response) Committed() bool {
 	return r.committed
 }
 
-// Writer implements `engine.Response#Writer` method.
+// Writer implements `engine.Response#Writer` function.
 func (r *Response) Writer() io.Writer {
 	return r.writer
 }
 
-// SetWriter implements `engine.Response#SetWriter` method.
+// SetWriter implements `engine.Response#SetWriter` function.
 func (r *Response) SetWriter(w io.Writer) {
 	r.writer = w
 }
 
 // Flush implements the http.Flusher interface to allow an HTTP handler to flush
 // buffered data to the client.
-// See [http.Flusher](https://golang.org/pkg/net/http/#Flusher)
+// See https://golang.org/pkg/net/http/#Flusher
 func (r *Response) Flush() {
 	r.ResponseWriter.(http.Flusher).Flush()
 }
 
 // Hijack implements the http.Hijacker interface to allow an HTTP handler to
 // take over the connection.
-// See [http.Hijacker](https://golang.org/pkg/net/http/#Hijacker)
+// See https://golang.org/pkg/net/http/#Hijacker
 func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
 	return r.ResponseWriter.(http.Hijacker).Hijack()
 }
@@ -94,7 +94,7 @@ func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
 // when the underlying connection has gone away.
 // This mechanism can be used to cancel long operations on the server if the
 // client has disconnected before the response is ready.
-// See [http.CloseNotifier](https://golang.org/pkg/net/http/#CloseNotifier)
+// See https://golang.org/pkg/net/http/#CloseNotifier
 func (r *Response) CloseNotify() <-chan bool {
 	return r.ResponseWriter.(http.CloseNotifier).CloseNotify()
 }
diff --git a/engine/standard/server.go b/engine/standard/server.go
index b7a4f0a8..6fc5e10e 100644
--- a/engine/standard/server.go
+++ b/engine/standard/server.go
@@ -80,17 +80,17 @@ func NewFromConfig(c engine.Config) (s *Server) {
 	return
 }
 
-// SetHandler implements `engine.Server#SetHandler` method.
+// SetHandler implements `engine.Server#SetHandler` function.
 func (s *Server) SetHandler(h engine.Handler) {
 	s.handler = h
 }
 
-// SetLogger implements `engine.Server#SetLogger` method.
+// SetLogger implements `engine.Server#SetLogger` function.
 func (s *Server) SetLogger(l *log.Logger) {
 	s.logger = l
 }
 
-// Start implements `engine.Server#Start` method.
+// Start implements `engine.Server#Start` function.
 func (s *Server) Start() error {
 	if s.config.Listener == nil {
 		return s.startDefaultListener()
diff --git a/engine/standard/url.go b/engine/standard/url.go
index a0a450ff..b382861e 100644
--- a/engine/standard/url.go
+++ b/engine/standard/url.go
@@ -10,17 +10,17 @@ type (
 	}
 )
 
-// Path implements `engine.URL#Path` method.
+// Path implements `engine.URL#Path` function.
 func (u *URL) Path() string {
 	return u.URL.Path
 }
 
-// SetPath implements `engine.URL#SetPath` method.
+// SetPath implements `engine.URL#SetPath` function.
 func (u *URL) SetPath(path string) {
 	u.URL.Path = path
 }
 
-// QueryValue implements `engine.URL#QueryValue` method.
+// QueryValue implements `engine.URL#QueryValue` function.
 func (u *URL) QueryValue(name string) string {
 	if u.query == nil {
 		u.query = u.Query()
@@ -28,7 +28,7 @@ func (u *URL) QueryValue(name string) string {
 	return u.query.Get(name)
 }
 
-// QueryString implements `engine.URL#QueryString` method.
+// QueryString implements `engine.URL#QueryString` function.
 func (u *URL) QueryString() string {
 	return u.URL.RawQuery
 }
diff --git a/group.go b/group.go
index 6a6f852f..8ee34255 100644
--- a/group.go
+++ b/group.go
@@ -1,6 +1,9 @@
 package echo
 
 type (
+	// Group is a set of sub-routes for a specified route. It can be used for inner
+	// routes that share a common middlware or functionality that should be separate
+	// from the parent echo instance while still inheriting from it.
 	Group struct {
 		prefix     string
 		middleware []Middleware
@@ -8,59 +11,71 @@ type (
 	}
 )
 
+// Use implements `Echo#Use()` for sub-routes within the Group.
 func (g *Group) Use(m ...Middleware) {
 	g.middleware = append(g.middleware, m...)
 }
 
+// Connect implements `Echo#Connect()` for sub-routes within the Group.
 func (g *Group) Connect(path string, h Handler, m ...Middleware) {
 	g.add(CONNECT, path, h, m...)
 }
 
+// Delete implements `Echo#Delete()` for sub-routes within the Group.
 func (g *Group) Delete(path string, h Handler, m ...Middleware) {
 	g.add(DELETE, path, h, m...)
 }
 
+// Get implements `Echo#Get()` for sub-routes within the Group.
 func (g *Group) Get(path string, h Handler, m ...Middleware) {
 	g.add(GET, path, h, m...)
 }
 
+// Head implements `Echo#Head()` for sub-routes within the Group.
 func (g *Group) Head(path string, h Handler, m ...Middleware) {
 	g.add(HEAD, path, h, m...)
 }
 
+// Options implements `Echo#Options()` for sub-routes within the Group.
 func (g *Group) Options(path string, h Handler, m ...Middleware) {
 	g.add(OPTIONS, path, h, m...)
 }
 
+// Patch implements `Echo#Patch()` for sub-routes within the Group.
 func (g *Group) Patch(path string, h Handler, m ...Middleware) {
 	g.add(PATCH, path, h, m...)
 }
 
+// Post implements `Echo#Post()` for sub-routes within the Group.
 func (g *Group) Post(path string, h Handler, m ...Middleware) {
 	g.add(POST, path, h, m...)
 }
 
+// Put implements `Echo#Put()` for sub-routes within the Group.
 func (g *Group) Put(path string, h Handler, m ...Middleware) {
 	g.add(PUT, path, h, m...)
 }
 
+// Trace implements `Echo#Trace()` for sub-routes within the Group.
 func (g *Group) Trace(path string, h Handler, m ...Middleware) {
 	g.add(TRACE, path, h, m...)
 }
 
+// Any implements `Echo#Any()` for sub-routes within the Group.
 func (g *Group) Any(path string, handler Handler, middleware ...Middleware) {
 	for _, m := range methods {
 		g.add(m, path, handler, middleware...)
 	}
 }
 
+// Match implements `Echo#Match()` for sub-routes within the Group.
 func (g *Group) Match(methods []string, path string, handler Handler, middleware ...Middleware) {
 	for _, m := range methods {
 		g.add(m, path, handler, middleware...)
 	}
 }
 
-// Group creates a new sub-group with prefix.
+// Group creates a new sub-group with prefix and optional sub-group-level middleware.
 func (g *Group) Group(prefix string, m ...Middleware) *Group {
 	m = append(g.middleware, m...)
 	return g.echo.Group(g.prefix+prefix, m...)
diff --git a/middleware/auth.go b/middleware/auth.go
index 670d782b..cbfb4c2d 100644
--- a/middleware/auth.go
+++ b/middleware/auth.go
@@ -7,10 +7,12 @@ import (
 )
 
 type (
+	// BasicAuthConfig defines config for HTTP basic auth middleware.
 	BasicAuthConfig struct {
 		AuthFunc BasicAuthFunc
 	}
 
+	// BasicAuthFunc defines a function to validate basic auth credentials.
 	BasicAuthFunc func(string, string) bool
 )
 
@@ -19,10 +21,11 @@ const (
 )
 
 var (
+	// DefaultBasicAuthConfig is the default basic auth middleware config.
 	DefaultBasicAuthConfig = BasicAuthConfig{}
 )
 
-// BasicAuth returns an HTTP basic authentication middleware.
+// BasicAuth returns an HTTP basic auth middleware.
 //
 // For valid credentials it calls the next handler.
 // For invalid credentials, it sends "401 - Unauthorized" response.
@@ -32,6 +35,8 @@ func BasicAuth(f BasicAuthFunc) echo.MiddlewareFunc {
 	return BasicAuthFromConfig(c)
 }
 
+// BasicAuthFromConfig returns an HTTP basic auth middleware from config.
+// See `BasicAuth()`.
 func BasicAuthFromConfig(config BasicAuthConfig) echo.MiddlewareFunc {
 	return func(next echo.Handler) echo.Handler {
 		return echo.HandlerFunc(func(c echo.Context) error {
diff --git a/middleware/compress.go b/middleware/compress.go
index 7f4aea6a..40a43577 100644
--- a/middleware/compress.go
+++ b/middleware/compress.go
@@ -13,7 +13,9 @@ import (
 )
 
 type (
+	// GzipConfig defines config for gzip middleware.
 	GzipConfig struct {
+		// Level is the gzip level.
 		Level int
 	}
 
@@ -24,7 +26,8 @@ type (
 )
 
 var (
-	defaultGzipConfig = GzipConfig{
+	// DefaultGzipConfig is the default gzip middleware config.
+	DefaultGzipConfig = GzipConfig{
 		Level: gzip.DefaultCompression,
 	}
 )
@@ -32,10 +35,11 @@ var (
 // Gzip returns a middleware which compresses HTTP response using gzip compression
 // scheme.
 func Gzip() echo.MiddlewareFunc {
-	return GzipFromConfig(defaultGzipConfig)
+	return GzipFromConfig(DefaultGzipConfig)
 }
 
-// GzipFromConfig return `Gzip` middleware from config.
+// GzipFromConfig return gzip middleware from config.
+// See `Gzip()`.
 func GzipFromConfig(config GzipConfig) echo.MiddlewareFunc {
 	pool := gzipPool(config)
 	scheme := "gzip"
diff --git a/middleware/logger.go b/middleware/logger.go
index d33a6977..cda593a8 100644
--- a/middleware/logger.go
+++ b/middleware/logger.go
@@ -15,26 +15,46 @@ import (
 )
 
 type (
+	// LoggerConfig defines config for logger middleware.
+	//
 	LoggerConfig struct {
-		Format   string
-		Output   io.Writer
+		// Format is the log format.
+		//
+		// Example "${remote_id} ${status}"
+		// Available tags:
+		// - time_rfc3339
+		// - remote_ip
+		// - method
+		// - path
+		// - status
+		// - response_time
+		// - response_size
+		Format string
+
+		// Output is the writer where logs are written. Default is `os.Stdout`.
+		Output io.Writer
+
 		template *fasttemplate.Template
 		color    *color.Color
 	}
 )
 
 var (
+	// DefaultLoggerConfig is the default logger middleware config.
 	DefaultLoggerConfig = LoggerConfig{
-		Format: "time=${time_rfc3339}, remote_ip=${remote_ip}, method=${method}, path=${path}, status=${status}, response_time=${response_time}, size=${size}\n",
+		Format: "time=${time_rfc3339}, remote_ip=${remote_ip}, method=${method}, path=${path}, status=${status}, response_time=${response_time}, response_size=${response_size} bytes\n",
 		color:  color.New(),
 		Output: os.Stdout,
 	}
 )
 
+// Logger returns a middleware that logs HTTP requests.
 func Logger() echo.MiddlewareFunc {
 	return LoggerFromConfig(DefaultLoggerConfig)
 }
 
+// LoggerFromConfig returns a logger middleware from config.
+// See `Logger()`.
 func LoggerFromConfig(config LoggerConfig) echo.MiddlewareFunc {
 	config.template = fasttemplate.New(config.Format, "${", "}")
 	config.color = color.New()
@@ -94,7 +114,7 @@ func LoggerFromConfig(config LoggerConfig) echo.MiddlewareFunc {
 					return w.Write([]byte(status))
 				case "response_time":
 					return w.Write([]byte(took.String()))
-				case "size":
+				case "response_size":
 					return w.Write([]byte(size))
 				default:
 					return w.Write([]byte(fmt.Sprintf("[unknown tag %s]", tag)))
diff --git a/middleware/recover.go b/middleware/recover.go
index 3885fe5b..a1f03b2a 100644
--- a/middleware/recover.go
+++ b/middleware/recover.go
@@ -9,14 +9,22 @@ import (
 )
 
 type (
+	// RecoverConfig defines config for recover middleware.
 	RecoverConfig struct {
-		StackSize  int
-		StackAll   bool
+		// StackSize is the stack size to be printed.
+		StackSize int
+
+		// StackAll is flag to format stack traces of all other goroutines into
+		// buffer after the trace for the current goroutine, or not. Default is true.
+		StackAll bool
+
+		// PrintStack is the flag to print stack or not. Default is true.
 		PrintStack bool
 	}
 )
 
 var (
+	// DefaultRecoverConfig is the default recover middleware config.
 	DefaultRecoverConfig = RecoverConfig{
 		StackSize:  4 << 10, // 4 KB
 		StackAll:   true,
@@ -24,12 +32,14 @@ var (
 	}
 )
 
+// Recover returns a middleware which recovers from panics anywhere in the chain
+// and handles the control to the centralized HTTPErrorHandler.
 func Recover() echo.MiddlewareFunc {
 	return RecoverFromConfig(DefaultRecoverConfig)
 }
 
-// Recover returns a middleware which recovers from panics anywhere in the chain
-// and handles the control to the centralized HTTPErrorHandler.
+// RecoverFromConfig returns a recover middleware from config.
+// See `Recover()`.
 func RecoverFromConfig(config RecoverConfig) echo.MiddlewareFunc {
 	return func(next echo.Handler) echo.Handler {
 		return echo.HandlerFunc(func(c echo.Context) error {
diff --git a/middleware/static.go b/middleware/static.go
index efa9c311..b5446657 100644
--- a/middleware/static.go
+++ b/middleware/static.go
@@ -9,26 +9,38 @@ import (
 )
 
 type (
+	// StaticConfig defines config for static middleware.
 	StaticConfig struct {
-		Root   string `json:"root"`
-		Index  string `json:"index"`
-		Browse bool   `json:"browse"`
+		// Root is the directory from where the static content is served.
+		Root string `json:"root"`
+
+		// Index is the index file to be used while serving a directory.
+		// Default is `index.html`.
+		Index string `json:"index"`
+
+		// Browse is the flag to list directory or not. Default is false.
+		Browse bool `json:"browse"`
 	}
 )
 
 var (
+	// DefaultStaticConfig is the default static middleware config.
 	DefaultStaticConfig = StaticConfig{
 		Index:  "index.html",
 		Browse: false,
 	}
 )
 
+// Static returns a static middleware to deliever static content from the provided
+// root directory.
 func Static(root string) echo.MiddlewareFunc {
 	c := DefaultStaticConfig
 	c.Root = root
 	return StaticFromConfig(c)
 }
 
+// StaticFromConfig returns a static middleware from config.
+// See `Static()`.
 func StaticFromConfig(config StaticConfig) echo.MiddlewareFunc {
 	return func(next echo.Handler) echo.Handler {
 		return echo.HandlerFunc(func(c echo.Context) error {
diff --git a/router.go b/router.go
index e3f82227..86c97f20 100644
--- a/router.go
+++ b/router.go
@@ -1,6 +1,8 @@
 package echo
 
 type (
+	// Router is the registry of all registered routes for an `Echo` instance for
+	// request matching and URL path parameter parsing.
 	Router struct {
 		tree   *node
 		routes []Route
@@ -37,6 +39,7 @@ const (
 	akind
 )
 
+// NewRouter returns a new Router instance.
 func NewRouter(e *Echo) *Router {
 	return &Router{
 		tree: &node{
@@ -47,6 +50,7 @@ func NewRouter(e *Echo) *Router {
 	}
 }
 
+// Handle implements `echo.Middleware` which makes router a middleware.
 func (r *Router) Handle(next Handler) Handler {
 	return HandlerFunc(func(c Context) error {
 		method := c.Request().Method()
@@ -56,10 +60,12 @@ func (r *Router) Handle(next Handler) Handler {
 	})
 }
 
+// Priority is super secret.
 func (r *Router) Priority() int {
 	return 0
 }
 
+// Add registers a new route for method and path with matching handler.
 func (r *Router) Add(method, path string, h Handler, e *Echo) {
 	ppath := path        // Pristine path
 	pnames := []string{} // Param names
@@ -280,6 +286,14 @@ func (n *node) check405() HandlerFunc {
 	return notFoundHandler
 }
 
+// Find lookup a handler registed for method and path. It also parses URL for path
+// parameters and load them into context.
+//
+// For performance:
+//
+// - Get context from `Echo#GetContext()`
+// - Reset it `Context#Reset()`
+// - Return it `Echo#PutContext()`.
 func (r *Router) Find(method, path string, context Context) {
 	ctx := context.Object()
 	cn := r.tree // Current node as root