下面是我的工作代码:

function IsJsonString(str) {
  try {
    var json = JSON.parse(str);
    return (typeof json === 'object');
  } catch (e) {
    return false;
  }
}

function get_json(txt)
{  var data

   try     {  data = eval('('+txt+')'); }
   catch(e){  data = false;             }

   return data;
}

如果有错误，返回false。

如果没有错误，则返回json数据

下面是typescript版本:

JSONTryParse(input: any) {
    try {
        //check if the string exists
        if (input) {
            var o = JSON.parse(input);

            //validate the result too
            if (o && o.constructor === Object) {
                return o;
            }
        }
    }
    catch (e: any) {
    }

    return false;
};

isValidJsonString - check for valid json string JSON data types - string, number, object (JSON object), array, boolean, null (https://www.json.org/json-en.html) falsy values in javascript - false, 0, -0, 0n, ", null, undefined, NaN - (https://developer.mozilla.org/en-US/docs/Glossary/Falsy) JSON.parse works well for number , boolean, null and valid json String won't raise any error. please refer example below JSON.parse(2) // 2 JSON.parse(null) // null JSON.parse(true) // true JSON.parse('{"name":"jhamman"}') // {name: "jhamman"} JSON.parse('[1,2,3]') // [1, 2, 3] break when you parse undefined , object, array etc it gave Uncaught SyntaxError: Unexpected end of JSON input . please refer example below JSON.parse({}) JSON.parse([]) JSON.parse(undefined) JSON.parse("jack")

function isValidJsonString(jsonString){
    
    if(!(jsonString && typeof jsonString === "string")){
        return false;
    }

    try{
       JSON.parse(jsonString);
       return true;
    }catch(error){
        return false;
    }

}

if(resp) {
    try {
        resp = $.parseJSON(resp);
        console.log(resp);
    } catch(e) {
        alert(e);
    }
}

希望这也适用于你

如果你有疑问，值是或不是json

  function isStringified(jsonValue) { // use this function to check
   try {
    console.log("need to parse");
    return JSON.parse(jsonValue);
   } catch (err) {
    console.log("not need to parse");

     return jsonValue; 
    }
  }

然后

  const json = isStringified(stringValue);

  if (typeof json == "object") {
      console.log("string is a valid json")
    }else{
      console.log("string is not a valid json")
    }