JSON.parse() a wrong string

Question

I have a string that I obtain via a user, so it is not guaranteed to be a correct JSON string format.

This problem may cause the rest of the js code to be stop.

Consider the following example:

var a='==wrong string===';
var b=JSON.parse(a);
alert(1); //will not implemented

How to avoid this problem?

https://stackoverflow.com/questions/4467044/proper-way-to-catch-exception-from-javascript-method-json-parse — Suresh Atta, Jul 04 '17 at 11:55
@Sirko is right, and then you can right a help function that will return null if the JSON input is not valid.. — ngeksyo, Jul 04 '17 at 11:55

score 1 · Answer 1 · edited Jul 04 '17 at 12:01

1

You can use try catch block:

var a='==wrong string===';
try{
  var b=JSON.parse(a);
 }catch(e){
  console.log(e.message); /*use e.message to get the exact error */
 }
alert(1)

edited Jul 04 '17 at 12:01

Shubham

answered Jul 04 '17 at 11:55

Carlos Franco

1 Answers1