fix: 修复 isJson 校验 (#2416)

Co-authored-by: wangfucheng <wangfucheng@machloop.com>

__tests__/utils/validations.test.ts

@@ -465,6 +465,21 @@ test('validation:isJson invalid', () => {
   ).toMatchObject(['请检查 Json 格式']);
 });
 
+test('validation:isJson invalid', () => {
+  expect(
+    validate(
+      '12345',
+      {},
+      {
+        isJson: true
+      },
+      {
+        isJson: '请检查 Json 格式'
+      }
+    )
+  ).toMatchObject(['请检查 Json 格式']);
+});
+
 test('validation:isLength valid', () => {
   expect(
     validate(

src/utils/validations.ts

@@ -149,7 +149,11 @@ export const validations: {
   isJson: function (values, value, minimum) {
     if (isExisty(value) && !isEmpty(value) && typeof value === 'string') {
       try {
-        JSON.parse(value);
+        const result = JSON.parse(value);
+        if (typeof result === 'object' && result) {
+          return true;
+        }
+        return false;
       } catch (e) {
         return false;
       }