diff --git a/feature_iter_float.go b/feature_iter_float.go
index 86f4599..4f883c0 100644
--- a/feature_iter_float.go
+++ b/feature_iter_float.go
@@ -1,6 +1,7 @@
 package jsoniter
 
 import (
+	"encoding/json"
 	"io"
 	"math/big"
 	"strconv"
@@ -339,3 +340,8 @@ func validateFloat(str string) string {
 	}
 	return ""
 }
+
+// ReadNumber read json.Number
+func (iter *Iterator) ReadNumber() (ret json.Number) {
+	return json.Number(iter.readNumberAsString())
+}
diff --git a/jsoniter_float_test.go b/jsoniter_float_test.go
index d90ff2b..3955be0 100644
--- a/jsoniter_float_test.go
+++ b/jsoniter_float_test.go
@@ -192,6 +192,13 @@ func Test_lossy_float_marshal(t *testing.T) {
 	should.Equal("0.123457", output)
 }
 
+func Test_read_number(t *testing.T) {
+	should := require.New(t)
+	iter := ParseString(ConfigDefault, `92233720368547758079223372036854775807`)
+	val := iter.ReadNumber()
+	should.Equal(`92233720368547758079223372036854775807`, string(val))
+}
+
 func Benchmark_jsoniter_float(b *testing.B) {
 	b.ReportAllocs()
 	input := []byte(`1.1123,`)