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.MJS File Extension

File TypeNode.js ES Module File

4.3 (9 Votes)
CategoryWeb Files

What is an MJS file?

An MJS file is a source code file containing an ES Module (ECMAScript Module) for use with a Node.js application. MJS files are written in JavaScript, and may also use the .JS extension outside of the Node.js context. ES Modules allow web and application developers to organize code into smaller reusable components.

More Information

ECMAScript 6 (ES6) introduced the specification for ES Modules, providing a standard for implementing modules in JavaScript. As of 2018, all major web browsers support ES Modules.

However, the popularity of modularized JavaScript pre-dates ES6. Node.js, a JavaScript runtime environment, used CommonJS as the specification for modules. Because so many existing applications were built with CommonJS, when Node.js added support for native ES modules, it controversially introduced the MJS file extension to differentiate the two and prevent applications from breaking.

NOTE: Some developers informally refer to MJS files as "Michael Jackson Script" files.

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Programs that open MJS files

Updated 11/8/2018

About MJS Files

Our goal is to help you understand what a file with a *.mjs suffix is and how to open it.

The Node.js ES Module file type, file format description, and Mac, Windows, and Linux programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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