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Last Updated: June 2, 2026

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TypeError ERR INVALID CALLBACK - Callback must be a function Received undefined

TypeError [ERROR_INVALID_CALLBACK]: callback must be a function || solved

TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined

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TypeError ERR INVALID CALLBACK - Callback must be a function Received undefined

TypeError [ERROR_INVALID_CALLBACK]: callback must be a function || solved

TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined

THE CALLBACK TRAP: 3 Ways to Fix JavaScript's this

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Error: Route.get requires a callback function but got a [object Object]