Use json marshall in context json to fix breaking new line issue. Fixes #2209 (#2228)

* ignore IntelliJ idea generated files

* update JSON renderer to use Marshall() instead of Encode(). Fix #2209

* Revert "ignore IntelliJ idea generated files"

This reverts commit e7bd017227df5dbd2ed2f5fe353adb5f1b08c678.

Co-authored-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Co-authored-by: thinkerou <thinkerou@gmail.com>

render/json.go

@@ -69,8 +69,11 @@ func (r JSON) WriteContentType(w http.ResponseWriter) {
 // WriteJSON marshals the given interface object and writes it with custom ContentType.
 func WriteJSON(w http.ResponseWriter, obj interface{}) error {
 	writeContentType(w, jsonContentType)
-	encoder := json.NewEncoder(w)
-	err := encoder.Encode(&obj)
+	jsonBytes, err := json.Marshal(obj)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(jsonBytes)
 	return err
 }