In-browser code editor



Build Status
NPM version

CodeMirror is a versatile text editor implemented in JavaScript for
the browser. It is specialized for editing code, and comes with over
100 language modes and various addons that implement more advanced
editing functionality. Every language comes with fully-featured code
and syntax highlighting to help with reading and editing complex code.

A rich programming API and a CSS theming system are available for
customizing CodeMirror to fit your application, and extending it with
new functionality.

You can find more information (and the
manual) on the project
. For questions and discussion, use the
discussion forum.

for contributing guidelines.

The CodeMirror community aims to be welcoming to everybody. We use the
Contributor Covenant
as our code of


Either get the zip file with
the latest version, or make sure you have Node
installed and run:

npm install codemirror

NOTE: This is the source repository for the library, and not the
distribution channel. Cloning it is not the recommended way to install
the library, and will in fact not work unless you also run the build


To build the project, make sure you have Node.js installed (at least version 6)
and then npm install. To run, just open index.html in your
browser (you don’t need to run a webserver). Run the tests with npm test.