How to check boolean in JavaScript?

September 16, 2022

To check boolean in JavaScript, do this: typeof value === 'boolean'.

Here's how you do it:

const aNumber = 2;
const aString = 'Hello World!';
const aBoolean = true;

console.log(typeof aNumber === 'boolean'); // false
console.log(typeof aString === 'boolean'); // false
console.log(typeof aBoolean === 'boolean'); // true