index.js' does not provide an export named 'default'

Question

I'm new to MERN development. I'm trying to build a learning management system by following an old tutorial. But I ended up getting this error:

> C:\Users\MRPla\Downloads\CourseGuccho\edemy\server\middlewares\index.js:1
> import {expressJwt}  from "express-jwt"; SyntaxError: The requested
> module
> 'file:///C:/Users/MRPla/Downloads/CourseGuccho/edemy/server/node_modules/express-jwt/dist/index.js'
> does not provide an export named 'expressJwt'
>     at Object.<anonymous> (C:\Users\MRPla\Downloads\CourseGuccho\edemy\server\middlewares\index.js:1)
>     at Generator.next (<anonymous>)
>     at Object.<anonymous> (C:\Users\MRPla\Downloads\CourseGuccho\edemy\server\routes\auth.js:1)
>     at Generator.next (<anonymous>)
>     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10) [nodemon] app crashed -
> waiting for file changes before starting...

The relevant code is as follows:

server>middlewares>index.js:

import expressJwt from "express-jwt";

export const requireSignin = expressJwt({
  getToken: (req, res) => req.cookies.token,
  secret: process.env.JWT_SECRET,
  algorithms: ["HS256"],
});

server>routes>auth.js:

import express from "express";

const router = express.Router();

// middleware
import { requireSignin } from "../middlewares";

// controllers
import { register, login, logout, currentUser } from "../controllers/auth";

router.post("/register", register);
router.post("/login", login);
router.get("/logout", logout);
router.get("/current-user", requireSignin, currentUser);

module.exports = router;

I have also used this format for middlewares:

1.

import {expressJwt}  from "express-jwt";

export const requireSignin = expressJwt({
  getToken: (req, res) => req.cookies.token,
  secret: process.env.JWT_SECRET,
  algorithms: ["HS256"],
});

import {expressJwt}  from "express-jwt";

const requireSignin = expressJwt({
  getToken: (req, res) => req.cookies.token,
  secret: process.env.JWT_SECRET,
  algorithms: ["HS256"],
});

export default requireSignin;

but this doesn't help at all.

Here is the package.JSON file (for server):

{
  "name": "server",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "start": "nodemon -r esm server.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt": "^5.1.0",
    "cookie-parser": "^1.4.6",
    "cors": "^2.8.5",
    "csurf": "^1.11.0",
    "dotenv": "^8.6.0",
    "esm": "^3.2.25",
    "express": "^4.18.2",
    "express-jwt": "^7.7.7",
    "jsonwebtoken": "^8.5.1",
    "mongoose": "^5.13.15",
    "morgan": "^1.10.0",
    "nodemon": "^2.0.20"
  },
  "description": ""
}

Answer 1

The correct way to import in this case is:

import {expressjwt} from "express-jwt";

(lowercase j )

Another thing to try in general when you encounter errors like

The requested module [...] does not provide an export named 'default'

is using a star-import :

import * as X from "x";