Dev json engine

context.go

@@ -87,9 +87,18 @@ type Context struct {
 	// or PUT body parameters.
 	formCache url.Values
 
-	// SameSite allows a server to define a cookie attribute making it impossible for
+	// sameSite allows a server to define a cookie attribute making it impossible for
 	// the browser to send this cookie along with cross-site requests.
 	sameSite http.SameSite
+
+	// jsonRender the JSON renderer currently used. The default value is render.JSON,
+	// which is used to get the JSON rendering type when executing the c.JSON function.
+	jsonRender func(data any) render.Render
+}
+
+// SetJSONRender set the current JSON render
+func (c *Context) SetJSONRender(jsonRender func(data any) render.Render) {
+	c.jsonRender = jsonRender
 }
 
 /************************************/
@@ -109,6 +118,8 @@ func (c *Context) reset() {
 	c.queryCache = nil
 	c.formCache = nil
 	c.sameSite = 0
+	// registering a default JSON renderer
+	c.jsonRender = render.NewJSON
 	*c.params = (*c.params)[:0]
 	*c.skippedNodes = (*c.skippedNodes)[:0]
 }
@@ -1095,7 +1106,7 @@ func (c *Context) JSONP(code int, obj any) {
 // JSON serializes the given struct as JSON into the response body.
 // It also sets the Content-Type as "application/json".
 func (c *Context) JSON(code int, obj any) {
-	c.Render(code, render.JSON{Data: obj})
+	c.Render(code, c.jsonRender(obj))
 }
 
 // AsciiJSON serializes the given struct as JSON into the response body with unicode to ASCII string.

context_test.go

@@ -9,6 +9,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"github.com/gin-gonic/gin/render"
 	"html/template"
 	"io"
 	"io/fs"
@@ -166,7 +167,7 @@ func TestSaveUploadedFileWithPermission(t *testing.T) {
 	require.NoError(t, err)
 	mw.Close()
 	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("POST", "/", buf)
+	c.Request, _ = http.NewRequest(http.MethodPost,, "/", buf)
 	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
 	f, err := c.FormFile("file")
 	require.NoError(t, err)
@@ -187,7 +188,7 @@ func TestSaveUploadedFileWithPermissionFailed(t *testing.T) {
 	require.NoError(t, err)
 	mw.Close()
 	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("POST", "/", buf)
+	c.Request, _ = http.NewRequest(http.MethodPost, "/", buf)
 	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
 	f, err := c.FormFile("file")
 	require.NoError(t, err)
@@ -3123,3 +3124,31 @@ func TestContextNext(t *testing.T) {
 	assert.True(t, exists)
 	assert.Equal(t, "value3", value)
 }
+
+// MyJSON customizing JSON rendering
+type MyJSON struct {
+	Data any
+	render.JSON
+}
+
+// Render rewrite the Render function
+func (r MyJSON) Render(w http.ResponseWriter) error {
+	_, err := w.Write([]byte("test"))
+	return err
+}
+
+func NewMyJSON(data any) render.Render {
+	return &MyJSON{Data: data}
+}
+
+// TestCustomJSONRender the test uses a custom JSON render.
+// The final result is that the user can customize the JSON render without affecting the original function.
+func TestCustomJSONRender(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, _ := CreateTestContext(w)
+	c.SetJSONRender(NewMyJSON)
+
+	c.JSON(http.StatusCreated, H{"foo": "bar", "html": "<b>"})
+
+	t.Log(w.Body.String())
+}

render/json.go

@@ -19,6 +19,10 @@ type JSON struct {
 	Data any
 }
 
+func NewJSON(data any) Render {
+	return &JSON{Data: data}
+}
+
 // IndentedJSON contains the given interface object.
 type IndentedJSON struct {
 	Data any