Extensible Code Editor

CodeMirror is a code editor component for the web. It can be used in websites to implement a text input field with support for many editing features, and has a rich programming interface to allow further extension.

This is a CodeMirror field, configured for editing JavaScript code.

Features

• Accessibility

  Works well with screen readers and keyboard-only users.

• Mobile Support

  Use the platform's native selection and editing features on phones.

• Bidirectional Text

  Support mixing of right-to-left and left-to-right text.

• Syntax Highlighting

  Color code to reflect syntactic structure.

• Line Numbers

  Display gutters with line numbers or other information next to the code.

• Autocompletion

  Provide language-specific completion hints in the editor.

• Code Folding

  Temporarily hide parts of the document.

• Search/Replace

  Editor-specific search, regexp search, and replace functionality.

• Full Parsing

  Detailed parse trees allow many types of language integration.

• Extension Interface

  Robustly implement demanding editor extensions.

• Modularity

  Most features are implemented on top of a generic public API.

• Speed

  Remains responsive even on huge documents and long lines.

• Bracket Closing

  Automatically insert matching brackets during typing.

• Linting

  Show error and warning messages in the editor.

• Flexible Styling

  Mix font styles and sizes, add widgets in the content.

• Theming

  Import or create custom visual editor styles.

• Collaborative Editing

  Allow multiple users to edit the same document.

• Undo History

  Undo and redo functionality with collab editing support.

• Multiple Selections

  Select and edit multiple ranges of the document at once.

• Internationalization

  Provide custom text to display or announce to the user.

• ...and more

  Find a full description of the library's features in the docs.

About

CodeMirror is open source under a permissive license (MIT). It is being developed on GitHub. Contributions are welcome.

If you are using CodeMirror commercially, there is a social (but no legal) expectation that you help fund its maintenance. Start here.

The library supports browsers up from Internet Explorer 11 (with some polyfills).

Discussing the project, or asking questions, is best done on the forum. Bugs should be reported through the issue tracker. We aim to be an inclusive, welcoming community. To make that explicit, we have a code of conduct that applies to communication around the project.

Language Support

A full parser package, often with language-specific integration and extension code, exists for the following languages:

• Angular
• CSS
• C++
• Go
• HTML
• Java
• JavaScript
• JSON
• Liquid
• Markdown
• PHP
• Python
• Rust
• Sass
• Vue
• XML
• YAML

There is also a collection of CodeMirror 5 modes that can be used, and a list of community-maintained language packages. If your language is not listed above, you may still find a solution there.

Sponsors

These wonderful companies and organizations help fund development and maintenance of CodeMirror.

Gold

Holmusk

Silver

Bronze

Amplenote ARTCOMPILER