CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. If a mode has been written for the language you are editing, the code will be coloured, and the editor will optionally help you with indentation.

This is the project page for CodeMirror 2, the currently more actively developed, and recommended version. CodeMirror 1 is still available from here.

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Supported modes:

Usage demos:

Real-world uses:

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