Articles/JavaScript

"ReferenceError" in JavaScript — What It Means and How to Fix It

What the JavaScript error "ReferenceError" means and how to fix it.

Published October 29, 2026

"ReferenceError" is thrown when code references a variable that doesn't exist in any accessible scope.

Key points

  • Check the browser console's stack trace to find exactly which line and call triggered the error

Example

console.log(x)  // ReferenceError: x is not defined
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