(node:9374) Warning: To load an ES module, set "type": "module"

Question

I just started to learn React today. How do I get rid of that error message on my Console in the Terminal in Visual Studio.

(node: 9374)Warning: To load an ES module,
 set "type": "module" in the package.json or use the .mjs extension. 
/Users/nishihaider/workspace-ui/react-todo-app/src/App.js:1

import React from "react";
import "./App.css";

function App() {
  <>
  return (
  <h1>ToDo</h1>
  );
  </>
}

export default App;

Answer 1

First, install the latest version of Node.js. It has the latest and greatest features.

Second, add the "type": "module" line in your package.json file.

{

  "type": "module"

}

Third, use the --experimental-modules flag when invoking nodejs:

node --experimental-modules app.js

You should be good to go!

An alternative is to avoid adding the "type": "module" line in your package.json file and instead rename your app.js file to app.mjs.

Note that now the require() syntax will stop working.

Answer 2

Here is my approach:

1 - Update package.json like:

  "main": "index.js",
  "type":"module",

2 - use.js when importing, like:

import {isPrime} from './isPrime.js';

3 - here is isPrime.js

export const isPrime ....

Answer 3

You just need to update package.json like this,

{"type": "module"}

It's worked for me, Thanks!

Answer 4

to add Type: module in package.json - helps :)

package.json contain:

{
  "name": "react_template",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "webpack": "^5.30.0",
    "webpack-cli": "^4.6.0"
  }
}

Answer 5

For those using TypeScript with node.js, and is trying to use the import statement. I have found that setting the module to value es2015 in the tsconfig.json gives this error, while setting it to commonjs works.

tsconfig.json

    {
     "module": "commonjs"
    }

Answer 6

Just Change this:

export default App;

To this:

module.exports = App;

Answer 7

I have a parent file importing child components, so I get same problem about ES module. in my case, I must define more details when i import the component. like this:

import db from "../config/Database"; false
import db from "../config/Database.js"; true

Another example :

import Users from "../models/UserModel"; incorrect
import Users from "../models/UserModel.js"; correct

I don't know why it has to be like this, but when I try the problem is resolved. I hope this helps

Answer 8

you are also sorrounding the return statement with React Fragments which is not correct. Your return statement should look like the following:

 import React from "react";
 import "./App.css";

 function App() {
   return (
    <>
      <h1>ToDo</h1>
    </>
   );
 }

export default App;

I'm quite sure this was the source of your issues all along and not the module import/export issue.

Answer 9

adding the "type": "module" line in your package.json file and instead rename your app.js file (or whatever) to app.mjs.

Answer 10

SIMPLE AND FAST SOLUTION FOR BEGINNERS

1 RENAME YOUR JS FILE MJS LIKE (hello.js > hello.mjs)

2 GIVE MJS FILE NAME IN YOUR EXPORT LIKE ( import { first } from './pg.mjs')