The error message Must use import to load ES Module typically occurs in Node.js when you try to use ES6-style import syntax in a CommonJS module. This happens when you're trying to use ECMAScript Modules (ESM) syntax in a file that Node.js interprets as a CommonJS module.

Here's how you can address this issue:

1. Check File Extension:

   • Ensure that the file extension is either .mjs (for ESM) or .js (for CommonJS). If Node.js detects a .mjs file, it will treat it as an ECMAScript module.

2. Specify .mjs Extension:

   • If you're working with ECMAScript modules, make sure the file extension is .mjs and that you're using the import syntax correctly.

   Example of ESM syntax in a .mjs file:

   javascript

• // mymodule.mjs const myFunction = () => { console.log('Hello World'); }; export { myFunction };

• Update Node.js Version:

  • Ensure you're using a version of Node.js that supports ECMAScript modules. Node.js added support for ECMAScript modules in version 12 and improved it in subsequent releases.

• Package.json Configuration:

  • If you're using ECMAScript modules, make sure you have "type": "module" in your package.json file. This tells Node.js to treat all .js files as ESM.

  Example package.json:

  JSON
• { "type": "module", "main": "index.js" }

• Use --experimental-modules Flag:

  • If you're using an older version of Node.js, you might need to use the --experimental-modules flag to enable ESM support.

  Example:

  CSS

5. node --experimental-modules mymodule.mjs

6. Check Import Statements:

   • Ensure that your import statements are correctly formatted and pointing to the correct file paths.

7. Check File Paths:

   • Ensure that the file you're trying to import is in the correct location relative to the file that you are trying to import.

8. Check for Typos:

   • Double-check for any spelling mistakes or syntax errors in your code.

9. Check for Compatibility:

   • If you're using third-party libraries or modules, make sure they are compatible with ECMAScript modules.

10. Babel or Transpilation:

    • If you're using a build process with Babel or a similar transpiler, ensure it's set up correctly to handle ESM syntax.

If none of these suggestions resolve the issue, it might be helpful to provide more context about your specific code and environment so that I can offer more targeted advice.