Web Reference: Aug 22, 2021 · JavaScript exception "variable is not defined" occurs when there is a non-existent variable referenced somewhere. Forgetting to define a variable before referencing it may be the most common reference error trigger for developers. 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. ReferenceError is a serializable object, so it can be cloned with structuredClone() or copied between Workers using postMessage(). Jan 14, 2025 · In this guide, we explore the common causes of this error and provide actionable solutions to help you resolve it efficiently, ensuring your JavaScript code runs smoothly.
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