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JavaScript - check if string is empty / null / undefined

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Created by:
Lilly-Grace-Greig
211

This article will show you how to check if the string is empty / null / undefined in JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const myString = '';

if (myString) {
    console.log('myString is not empty');
} else {
    console.log('myString is empty / null / undefined');
}

If you only want to check if a string is an empty use this:

if (myString === '') {
    console.log('myString is empty');
} else {
    console.log('myString is not empty');
}

 

Practical example

// ONLINE-RUNNER:browser;

const isEmpty = (string) => {
    return string ? false : true;
};

console.log( isEmpty('') );            // true
console.log( isEmpty(null) );          // true
console.log( isEmpty(undefined) );     // true
console.log( isEmpty('sample text') ); // false

JavaScript - String (popular problems)

JavaScript - check if string is empty / null / undefined
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