Web Reference: Feb 22, 2011 · With null you use it generally to erase the contents of a variable, with undefined it generally comes with input when there hasn't been set a value yet. Jul 23, 2025 · undefined indicates a variable hasn’t been initialized, while null is intentionally assigned to indicate no value. Understanding the distinction helps write cleaner, more predictable code in JavaScript, especially when handling default values or checking for missing data. Oct 28, 2025 · JavaScript is unique to have two nullish values: null and undefined. Semantically, their difference is very minor: undefined represents the absence of a value, while null represents the absence of an object.
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