How do .js files and .mjs files differ from each other?

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.js files and .mjs files are both JavaScript files that contain code written in the JavaScript programming language. However, there are differences between them.

.js files are the traditional format for JavaScript files. They can be executed in a browser or in a Node.js environment and typically contain client-side or server-side code.

.mjs files, on the other hand, are a newer format for JavaScript files that support ES6 modules. They can only be executed in a Node.js environment with the --experimental-modules flag enabled and allow developers to write modular code using import and export statements. This makes it possible to organize and reuse code more effectively.

In summary, while both .js and .mjs files contain JavaScript code, .mjs files are written using ES6 modules and can only be executed in a Node.js environment with experimental modules enabled.