Express Solution

Error: ❌

D:\gkmee\Downloads\Rest API>node index.js (node:16836) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension. (Use `node --trace-warnings ...` to show where the warning was created) D:\gkmee\Downloads\Rest API\index.js:1 import express from 'express'; ^^^^^^ SyntaxError: Cannot use import statement outside a module at wrapSafe (node:internal/modules/cjs/loader:1350:18) at Module._compile (node:internal/modules/cjs/loader:1379:20) at Module._extensions..js (node:internal/modules/cjs/loader:1518:10) at Module.load (node:internal/modules/cjs/loader:1249:32) at Module._load (node:internal/modules/cjs/loader:1065:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:158:12) at node:internal/main/run_main_module:30:49 Node.js v22.2.0 D:\gkmee\Downloads\Rest API>

Solution:

The error you're encountering occurs because you are using the import syntax, which is part of ES modules, but Node.js is expecting CommonJS syntax (using require) by default.

Two Ways to Resolve the Issue:

1. Use require Syntax (CommonJS)

You can replace the import statements with require to use CommonJS modules. Modify your index.js file like this:

const express = require('express');

2. Enable ES Modules

• In the same folder as index.js, create or edit a package.json file and add "type": "module".

{
  "name": "your-app-name",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module", // Add this
  "scripts": {
	"start": "node index.js"
  },
  "dependencies": {
	"express": "^4.17.1"
  }
}

Error: ❌

const express = require('express');
                ^

ReferenceError: require is not defined in ES module scope, you can use import instead
This file is being treated as an ES module because it has a '.js' file extension and 'D:\gkmee\Downloads\Rest API\package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
    at file:///D:/gkmee/Downloads/Rest%20API/index.js:2:17
    at ModuleJob.run (node:internal/modules/esm/module_job:262:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:475:24)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:109:5)

Node.js v22.2.0
[nodemon] app crashed - waiting for file changes before starting...