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.

LIKE the video if it helped you, SUBSCRIBE for more JavaScript tutorials, and COMMENT your questions or share your favorite checking method!

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





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