use encode replace json marshal increase json encoder speed (#1546)

context_test.go

@@ -660,7 +660,7 @@ func TestContextRenderJSON(t *testing.T) {
 	c.JSON(http.StatusCreated, H{"foo": "bar", "html": "<b>"})
 
 	assert.Equal(t, http.StatusCreated, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}\n", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
@@ -688,7 +688,7 @@ func TestContextRenderJSONPWithoutCallback(t *testing.T) {
 	c.JSONP(http.StatusCreated, H{"foo": "bar"})
 
 	assert.Equal(t, http.StatusCreated, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\"}", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\"}\n", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
@@ -714,7 +714,7 @@ func TestContextRenderAPIJSON(t *testing.T) {
 	c.JSON(http.StatusCreated, H{"foo": "bar"})
 
 	assert.Equal(t, http.StatusCreated, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\"}", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\"}\n", w.Body.String())
 	assert.Equal(t, "application/vnd.api+json", w.Header().Get("Content-Type"))
 }
 
@@ -1117,7 +1117,7 @@ func TestContextNegotiationWithJSON(t *testing.T) {
 	})
 
 	assert.Equal(t, http.StatusOK, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\"}", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\"}\n", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
@@ -1281,7 +1281,7 @@ func TestContextAbortWithStatusJSON(t *testing.T) {
 	_, err := buf.ReadFrom(w.Body)
 	assert.NoError(t, err)
 	jsonStringBody := buf.String()
-	assert.Equal(t, fmt.Sprint(`{"foo":"fooValue","bar":"barValue"}`), jsonStringBody)
+	assert.Equal(t, fmt.Sprint("{\"foo\":\"fooValue\",\"bar\":\"barValue\"}\n"), jsonStringBody)
 }
 
 func TestContextError(t *testing.T) {

logger_test.go

@@ -369,15 +369,15 @@ func TestErrorLogger(t *testing.T) {
 
 	w := performRequest(router, "GET", "/error")
 	assert.Equal(t, http.StatusOK, w.Code)
-	assert.Equal(t, "{\"error\":\"this is an error\"}", w.Body.String())
+	assert.Equal(t, "{\"error\":\"this is an error\"}\n", w.Body.String())
 
 	w = performRequest(router, "GET", "/abort")
 	assert.Equal(t, http.StatusUnauthorized, w.Code)
-	assert.Equal(t, "{\"error\":\"no authorized\"}", w.Body.String())
+	assert.Equal(t, "{\"error\":\"no authorized\"}\n", w.Body.String())
 
 	w = performRequest(router, "GET", "/print")
 	assert.Equal(t, http.StatusInternalServerError, w.Code)
-	assert.Equal(t, "hola!{\"error\":\"this is an error\"}", w.Body.String())
+	assert.Equal(t, "hola!{\"error\":\"this is an error\"}\n", w.Body.String())
 }
 
 func TestLoggerWithWriterSkippingPaths(t *testing.T) {

middleware_test.go

@@ -246,5 +246,5 @@ func TestMiddlewareWrite(t *testing.T) {
 	w := performRequest(router, "GET", "/")
 
 	assert.Equal(t, http.StatusBadRequest, w.Code)
-	assert.Equal(t, strings.Replace("hola\n<map><foo>bar</foo></map>{\"foo\":\"bar\"}{\"foo\":\"bar\"}event:test\ndata:message\n\n", " ", "", -1), strings.Replace(w.Body.String(), " ", "", -1))
+	assert.Equal(t, strings.Replace("hola\n<map><foo>bar</foo></map>{\"foo\":\"bar\"}\n{\"foo\":\"bar\"}\nevent:test\ndata:message\n\n", " ", "", -1), strings.Replace(w.Body.String(), " ", "", -1))
 }

render/json.go

@@ -68,11 +68,8 @@ 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)
-	jsonBytes, err := json.Marshal(obj)
-	if err != nil {
-		return err
-	}
-	_, err = w.Write(jsonBytes)
+	encoder := json.NewEncoder(w)
+	err := encoder.Encode(&obj)
 	return err
 }
 

render/render_test.go

@@ -62,7 +62,7 @@ func TestRenderJSON(t *testing.T) {
 	err := (JSON{data}).Render(w)
 
 	assert.NoError(t, err)
-	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}\n", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }