Web Reference: Jul 10, 2025 · The ReferenceError object represents an error when a variable that doesn't exist (or hasn't yet been initialized) in the current scope is referenced. Jul 8, 2019 · Uncaught ReferenceError: [ref] is not defined is an error telling you your code has a reference that cannot be understood by the JavaScript interpreter and that it can't... well... interpret it. [ref] is the name of the reference triggering the error. Jul 23, 2025 · Reference Error: A Reference Error in JavaScript occurs when you try to use a variable or function that has not been declared or defined. This can happen if you misspell the name of a variable or function, or if you try to access a variable or function that is out of scope.
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