如何识别一个字符串是不是json格式

1、简单

{}

{"a":null}

{"a":1}

{"a":"test"}

{"a":1,"b":"test"}

 

2、带有数组

{"a":["1","2"]}

{"b":[1,2]}

 

3、带有json数组

{"a":[{"b":1,"c":"2"},{"d":null,"f":"2"}]}

 

4、数组嵌套\json嵌套

{"a":[{"b":1,"c":"2","d":[{"a":1},{"b":"c"}]},{"d":null,"f":"2"}]}

{"a":[{"b":1,"c":"2","d":[{"a":1},{"b":"c"},[{"a":1},{"b":"c"}]]},{"d":null,"f":"2"}]}

{"a":[{"b":1,"c":"2","d":[{"a":1},[{"a":1},{"b":"c"},[{"a":1},{"b":"c"},[{"a":1},{"b":"c"}]]]]},{"d":null,"f":"2"}]}

 

6、转义空格、换行、回车

{"a":\r\n"d"}