Add with_std_json build tag

common/badjson/array.go

@@ -3,9 +3,8 @@ package badjson
 import (
 	"bytes"
 
+	"github.com/sagernet/sing-box/common/json"
 	E "github.com/sagernet/sing/common/exceptions"
-
-	"github.com/goccy/go-json"
 )
 
 type JSONArray[T any] []T

common/badjson/json.go

@@ -1,9 +1,8 @@
 package badjson
 
 import (
+	"github.com/sagernet/sing-box/common/json"
 	E "github.com/sagernet/sing/common/exceptions"
-
-	"github.com/goccy/go-json"
 )
 
 func decodeJSON(decoder *json.Decoder) (any, error) {

common/badjson/object.go

@@ -4,10 +4,9 @@ import (
 	"bytes"
 	"strings"
 
+	"github.com/sagernet/sing-box/common/json"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/x/linkedhashmap"
-
-	"github.com/goccy/go-json"
 )
 
 type JSONObject struct {

common/json/gojson.go

@@ -0,0 +1,20 @@
+//go:build !with_std_json
+
+package json
+
+import "github.com/goccy/go-json"
+
+var (
+	Marshal    = json.Marshal
+	Unmarshal  = json.Unmarshal
+	NewEncoder = json.NewEncoder
+	NewDecoder = json.NewDecoder
+)
+
+type (
+	Encoder     = json.Encoder
+	Decoder     = json.Decoder
+	Token       = json.Token
+	Delim       = json.Delim
+	SyntaxError = json.SyntaxError
+)

common/json/std.go

@@ -0,0 +1,20 @@
+//go:build with_std_json
+
+package json
+
+import "encoding/json"
+
+var (
+	Marshal    = json.Marshal
+	Unmarshal  = json.Unmarshal
+	NewEncoder = json.NewEncoder
+	NewDecoder = json.NewDecoder
+)
+
+type (
+	Encoder     = json.Encoder
+	Decoder     = json.Decoder
+	Token       = json.Token
+	Delim       = json.Delim
+	SyntaxError = json.SyntaxError
+)