节点：Route.get() 需要一个回调函数，但得到了一个 [object Undefined]

Question

Im trying to create a simple CRUD app in node js and i get Route.get() requires a callback function but got a [object Undefined] on the router.get("/:id", userController.getUser); line

Routes.js

const express = require('express')
const userController= require('../controllers/userController.js')

const router = express.Router()

/* READ */
router.get("/:id", userController.getUser);

module.exports = router

Controller.js

const getUser = async (req, res) => {
  try {
    const { id } = req.params;
    const user = await User.findById(id);
    res.status(200).json(user);
  } catch (err) {
    res.status(404).json({ message: err.message });
  }
}

const Function..

const AnotherFunction..


module.exports = {
   getUser,
   Function,
  AnotherFunction,
}

console.log(userController.getUser.toString()) prints:

async (req, res) => {
  try {
    const { id } = req.params;
    const user = await User.findById(id);
    res.status(200).json(user);
  } catch (err) {
    res.status(404).json({ message: err.message });
  }
}

Answer 1

I don't have correct access rights to push into your repo so explaining the issue here.

In your auth.js you have exported verifyToken function as default export.

module.exports = verifyToken .

But you are destructuring when importing in postsController.js

const {verifyToken} = require ('../middleware/auth.js')

Importing like this will get the correct function =>

const verifyToken = require("../middleware/auth.js");

Change your postsController file as below. It should work.

const express = require("express");
const verifyToken = require("../middleware/auth.js");
module.exports = verifyToken;