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Last Updated: November 14, 2026
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![TypeError [ERROR_INVALID_CALLBACK]: callback must be a function || solved](https://i.ytimg.com/vi/N56ZKId-eNg/mqdefault.jpg)
![TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined](https://i.ytimg.com/vi/KUH8iXEtyCY/mqdefault.jpg)
![NodeJS : Error: .post() requires callback functions but got a [object Undefined] not working](https://i.ytimg.com/vi/RPpay5ufnec/mqdefault.jpg)
![NodeJS : Route.get() requires a callback function but got a [object Undefined]. What did I do wrong](https://i.ytimg.com/vi/6P7knlTag9I/mqdefault.jpg)
![NodeJS : Error: .post() requires callback functions but got a [object Undefined]](https://i.ytimg.com/vi/I2aJoxO5B68/mqdefault.jpg)
