---
title: "What is the difference between null and undefined in JavaScript?"  
description: "What is the difference between null and undefined in JavaScript?"  
author: "Ravi Vishwakarma"  
published: 2024-06-17  
updated: 2024-06-17  
canonical: https://www.mindstick.com/interview/33912/what-is-the-difference-between-null-and-undefined-in-javascript  
category: "javascript"  
tags: ["web development", "javascript", "front-end development"]  
reading_time: 1 minute  

---

# What is the difference between null and undefined in JavaScript?

`undefined` means a variable has been declared but **not assigned** a value. `null` is an assignment value that represents **no value** or **an empty** value.

```plaintext
let x, Z = null
console.log(x);
console.log(Z);
```

## Read also

[**What is the purpose of async and await in JavaScript? Provide an example.**](https://www.mindstick.com/interview/33911/what-is-the-purpose-of-async-and-await-in-javascript-provide-an-example)

## Answers

### Answer by Ravi Vishwakarma

`undefined` means a variable has been declared but **not assigned** a value. `null` is an assignment value that represents **no value** or **an empty** value.

```plaintext
let x, Z = null
console.log(x);
console.log(Z);
```

## Read also

[**What is the purpose of async and await in JavaScript? Provide an example.**](https://www.mindstick.com/interview/33911/what-is-the-purpose-of-async-and-await-in-javascript-provide-an-example)


---

Original Source: https://www.mindstick.com/interview/33912/what-is-the-difference-between-null-and-undefined-in-javascript

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