Can not Find module in "index.js" - node.js

Question

I'm stuck in this error...I'm trying but I can not fix it
This is my index.js file
import express from "express";
import dotenv from "dotenv";
import mongoose from "mongoose";
const app = express();
dotenv.config();
const connect = async () => {
try {
await mongoose.connect(process.env.MONGO);
console.log("Connected to mongoDB.");
} catch (error) {
throw error;
}
};
mongoose.connection.on("disconnected", () => {
console.log("mongoDB disconnected!");
});
app.listen(3000, () => {
connect();
console.log("Connected to backend.");
});
This is my pacakge.json file
{
"name": "quiz-app",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "node index.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"dotenv": "^16.0.2",
"express": "^4.18.1",
"mongoose": "^6.5.4"
},
"devDependencies": {
"webpack-cli": "^3.3.12"
}
}
when I run this app it shows this error
enter image description here

Answer 1

You are using ES6 style importing import express from "express"; but your package.json doesn't know about that. Because the default is CommonJS for Node.js right now. And that means it wants you to use const express = require("express");
If you want to change that to ES6, you need to add "type": "module", in your package.json.
For example:
...
"description": "",
"type": "module",
"main": "index.js",
...