NodeJS "Must use import to load ES Module"

Question

I'm trying to import myArr from hello.js into index.js. However I get an error of

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module 

File hello.js

export let myArr = ['hello', 'hi', 'hey']; 

File index.js

import { myArr } from './hello.js'; console.log(myArr); 

Where am I going wrong?

Answer 1

Use version 2:

npm install node-fetch@2 

node-fetch from v3 is an ESM-only module - you are not able to import it with require().

If you cannot switch to ESM, please use v2 which remains compatible with CommonJS. Critical bug fixes will continue to be published for v2.

Answer 2

I ran your code without any problems. Check for two things:

1. Node.js version >= 14. It only works with the latest version of Node.js.
2. Make sure your package.json includes a line for "type": "module". Without this line, Node.js assumes you want to use CommonJS modules rather than ESM.