w3resource

JavaScript: Check whether the provided argument is a valid JSON

JavaScript fundamental (ES6 Syntax): Exercise-183 with Solution

Write a JavaScript program to check if the provided argument is valid JSON.

  • Use JSON.parse() and a try... catch block to check if the provided string is a valid JSON.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const isValidJSON = obj => {
  try {
    JSON.parse(obj);
    return true;
  } catch (e) {
    return false;
  }
};
console.log(isValidJSON('{"name":"Adam","age":20}'));
console.log(isValidJSON('{"name":"Adam",age:"20"}'));
console.log(isValidJSON(null));

Sample Output:

true
false
true

Flowchart:

flowchart: Check whether the provided argument is a valid JSON

Live Demo:

See the Pen javascript-basic-exercise-183-1 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to join all elements of an array into a string and returns this string.
Next: Write a JavaScript program to check if a given string is upper case or not.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.