---
title: "Discussion on \"null vs undefined in JavaScript: Differences, Checks and When to Use Each (Tested Examples)\" | Hashnode"
description: "Discussion on \"null vs undefined in JavaScript: Differences, Checks and When to Use Each (Tested Examples)\". undefined means a value was never assigned (missing property, missing argument, bare return). null is an intentional empty value you assign yourself. Prefer === when you care which one you have, use ="
url: "https://hashnode.com/posts/javascript-null-vs-undefined/6af1fa81aab866a35fd040f7"
---

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# [null vs undefined in JavaScript: Differences, Checks and When to Use Each (Tested Examples)](https://mfaysaldev.hashnode.dev/javascript-null-vs-undefined?utm_source=hashnode&utm_medium=feed)

undefined means a value was never assigned (missing property, missing argument, bare return). null is an intentional empty value you assign yourself. Prefer === when you care which one you have, use =

18h ago · 12 min read · mfaysaldev.hashnode.dev  
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## Written by

[Mahir Faysal](https://hashnode.com/@mfaysaldev)

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Student web developer — PHP, JavaScript, Next.js

I write practical coding tutorials at https://mfaysal.com | Learning cybersecurity on TryHackMe: https://tryhackme.com/p/mfaysal.dev

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