use experimental go json v2 library (go-gitea#35392)

details: https://pkg.go.dev/encoding/json/v2

---------

Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Author: 3 people

go.mod

@@ -279,11 +279,11 @@ require (
 	go.uber.org/zap/exp v0.3.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go4.org v0.0.0-20230225012048-214862532bf5 // indirect
-	golang.org/x/exp v0.0.0-20250911091902-df9299821621 // indirect
-	golang.org/x/mod v0.28.0 // indirect
-	golang.org/x/time v0.13.0 // indirect
-	golang.org/x/tools v0.37.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250707201910-8d1bb00bc6a7 // indirect
+	golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b // indirect
+	golang.org/x/mod v0.27.0 // indirect
+	golang.org/x/time v0.12.0 // indirect
+	golang.org/x/tools v0.36.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250826171959-ef028d996bc1 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

go.sum

@@ -854,8 +854,8 @@ golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136/go.mod h1:JXzH8nQsPlswgeRAPE
 golang.org/x/exp v0.0.0-20191129062945-2f5052295587/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
-golang.org/x/exp v0.0.0-20250911091902-df9299821621 h1:2id6c1/gto0kaHYyrixvknJ8tUK/Qs5IsmBtrc+FtgU=
-golang.org/x/exp v0.0.0-20250911091902-df9299821621/go.mod h1:TwQYMMnGpvZyc+JpB/UAuTNIsVJifOlSkrZkhcvpVUk=
+golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b h1:DXr+pvt3nC887026GRP39Ej11UATqWDmWuS99x26cD0=
+golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b/go.mod h1:4QTo5u+SEIbbKW1RacMZq1YEfOBqeXa19JeshGi+zc4=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.31.0 h1:mLChjE2MV6g1S7oqbXC0/UcKijjm5fnJLUYKIYrLESA=

modules/json/json.go

@@ -29,7 +29,70 @@ type Interface interface {
 	Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error
 }
 
-var DefaultJSONHandler = getDefaultJSONHandler()
+var (
+	DefaultJSONHandler = getDefaultJSONHandler()
+
+	_ Interface = StdJSON{}
+	_ Interface = JSONiter{}
+)
+
+// StdJSON implements Interface via encoding/json
+type StdJSON struct{}
+
+// Marshal implements Interface
+func (StdJSON) Marshal(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+// Unmarshal implements Interface
+func (StdJSON) Unmarshal(data []byte, v any) error {
+	return json.Unmarshal(data, v)
+}
+
+// NewEncoder implements Interface
+func (StdJSON) NewEncoder(writer io.Writer) Encoder {
+	return json.NewEncoder(writer)
+}
+
+// NewDecoder implements Interface
+func (StdJSON) NewDecoder(reader io.Reader) Decoder {
+	return json.NewDecoder(reader)
+}
+
+// Indent implements Interface
+func (StdJSON) Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
+	return json.Indent(dst, src, prefix, indent)
+}
+
+// JSONiter implements Interface via jsoniter
+type JSONiter struct {
+	jsoniter.API
+}
+
+// Marshal implements Interface
+func (j JSONiter) Marshal(v any) ([]byte, error) {
+	return j.API.Marshal(v)
+}
+
+// Unmarshal implements Interface
+func (j JSONiter) Unmarshal(data []byte, v any) error {
+	return j.API.Unmarshal(data, v)
+}
+
+// NewEncoder implements Interface
+func (j JSONiter) NewEncoder(writer io.Writer) Encoder {
+	return j.API.NewEncoder(writer)
+}
+
+// NewDecoder implements Interface
+func (j JSONiter) NewDecoder(reader io.Reader) Decoder {
+	return j.API.NewDecoder(reader)
+}
+
+// Indent implements Interface, since jsoniter don't support Indent, just use encoding/json's
+func (j JSONiter) Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
+	return json.Indent(dst, src, prefix, indent)
+}
 
 // Marshal converts object as bytes
 func Marshal(v any) ([]byte, error) {

modules/json/jsonlegacy.go

@@ -7,10 +7,12 @@ package json
 
 import (
 	"io"
+
+	jsoniter "github.com/json-iterator/go"
 )
 
 func getDefaultJSONHandler() Interface {
-	return jsonGoccy{}
+	return JSONiter{jsoniter.ConfigCompatibleWithStandardLibrary}
 }
 
 func MarshalKeepOptionalEmpty(v any) ([]byte, error) {

modules/lfs/http_client_test.go

@@ -193,7 +193,7 @@ func TestHTTPClientDownload(t *testing.T) {
 		},
 		{
 			endpoint:      "https://invalid-json-response.io",
-			expectedError: "/(invalid json|invalid character)/",
+			expectedError: "/(invalid json|jsontext: invalid character)/",
 		},
 		{
 			endpoint:      "https://valid-batch-request-download.io",
@@ -301,7 +301,7 @@ func TestHTTPClientUpload(t *testing.T) {
 		},
 		{
 			endpoint:      "https://invalid-json-response.io",
-			expectedError: "/(invalid json|invalid character)/",
+			expectedError: "/(invalid json|jsontext: invalid character)/",
 		},
 		{
 			endpoint:      "https://valid-batch-request-upload.io",