How to check if a string is a valid JSON string in JavaScript without using Try/Catch

Question

Something like:

var jsonString = '{ "Id": 1, "Name": "Coke" }';  //should be true IsJsonString(jsonString);  //should be false IsJsonString("foo"); IsJsonString("<div>foo</div>") 

The solution should not contain try/catch. Some of us turn on "break on all errors" and they don't like the debugger breaking on those invalid JSON strings.

Answer 1

Use a JSON parser like JSON.parse:

function IsJsonString(str) {     try {         JSON.parse(str);     } catch (e) {         return false;     }     return true; }