How to Check for Undefined or Null in JavaScript (2025)

❓ Learn How to Check if a Value is Undefined or Null in JavaScript | Easy & Effective Methods (2025 Tutorial)

Handling undefined and null values correctly is essential to write bug-free JavaScript code. These two are different but often confused concepts that can cause errors if not checked properly.

In this tutorial, you’ll learn:
✅ Difference between undefined and null in JavaScript
✅ How to check if a variable is undefined or null using strict equality (===)
✅ Using loose equality (==) for combined checks
✅ How to use typeof and other methods to detect undefined
✅ Best practices for safe value checks in conditional statements
✅ Real-world examples including form validation, default values, and error handling

Perfect for beginners and developers aiming to write robust and error-free JavaScript code.

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✅ 3. Hashtags
#JavaScript #UndefinedVsNull #JavaScriptTutorial #LearnJavaScript #CodingTips #JavaScriptBasics #WebDevelopment #JS2025 #FrontendDevelopment #NullCheck #UndefinedCheck

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