Web Reference: That expression can be complex. So when you see undefined is not a function it means that expression did not return a function object. So you have to figure out why what you are trying to execute isn't a function. And in this case, it was because you didn't put something where you thought you did. Oct 3, 2025 · Encountering the dreaded "undefined is not a function" error in JavaScript? This guide provides a clear explanation of the error, common causes like typos, incorrect imports, and asynchronous issues, and practical debugging steps. You're trying to call something as a function using parentheses (), but that value is undefined. This means either the function doesn't exist, it hasn't been defined yet, or you're accessing it incorrectly. firstName: 'John', lastName: 'Doe' firstName: 'John', lastName: 'Doe', getName() {
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