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Monaco Editor

https://github.com/microsoft/monaco-editor
Visit microsoft.github.io
Category
Developer Tools
Rank
No. 195Tools index
Pricing
Open Source
Type
TOOL
Builder
microsoft
GitHub
46.7k stars
Latest release
v0.56.0
Date

About

The browser-based code editor that powers VS Code, packaged for embedding in web apps with syntax highlighting and IntelliSense.

What it does

Monaco separates editable content into URI-identified models and visible editor views. Providers add completions, hover details, and other language-aware behavior, while workers move heavy language processing away from the interface thread.

Why it's ranked here

A strong choice for serious desktop web editing. Its model and provider design supports virtual file systems and language-aware behavior, while documented samples cover major bundlers. The cost is real integration work around workers, resource cleanup, and stable model URIs.

What's good

Models retain content, language, and edit history independently from the visible editor. URI-based identity helps project-like experiences resolve imports and select JSON schemas. Providers extend completion and hover behavior. Language services run expensive work in web workers, and the package includes TypeScript API declarations.

Tradeoffs

Mobile browsers and mobile web frameworks are unsupported. VS Code extensions do not generally run in Monaco, except potentially JavaScript language-server extensions built entirely around the Language Server Protocol. TextMate grammars require an external integration. Worker setup varies by bundler, and local file pages cannot create workers.

How to use it well

Use Monaco for desktop web applications that need rich editing across one or more virtual files. Assign meaningful, unique URIs early, configure workers for your bundler, and dispose editors and models explicitly. Use the playground for experiments and reproducible bugs. Do not treat it as a mobile editor or VS Code extension host.

Technical notes+

src/index.ts loads monaco-editor-core, registers all bundled features and CSS, HTML, JSON, and TypeScript languages, then exports the editor API and lsp. src/editor.ts re-exports the core ESM editor API. package.json exposes typed import and require entry points, while docs/integrate-esm.md documents distinct worker wiring for Webpack, Parcel, and Vite. monaco-lsp-client/src/index.ts exports MonacoLspClient plus WebSocket, worker, and iframe transports. webpack-plugin/src/index.ts can select languages and features, emit worker entries, set public paths, and optionally expose the global API. The README states that only the declared TypeScript API is versioned; other internals may break between releases.

Observed

License
MIT
Primary language
TypeScript
Install surface
npm package named monaco-editor
Packaging
ESM and require entry points with TypeScript declarations; legacy AMD build is deprecated
Interface
Embeddable browser library with editor, language provider, and LSP client APIs
Bundler support
Documented integration paths for Webpack, Parcel, and Vite
Platform support
Requires a web server for workers; mobile browsers and mobile web app frameworks are unsupported
Testing structure
Repository scripts include Playwright smoke tests and language grammar tests

Read from README.md, package.json, src/index.ts, src/editor.ts, docs/integrate-esm.md, gulpfile.js, website/webpack.config.ts, monaco-lsp-client/rolldown.config.mjs, scripts/lib/index.ts, webpack-plugin/src/index.ts, monaco-lsp-client/src/index.ts, monaco-lsp-client/src/types.ts, monaco-lsp-client/src/utils.ts, samples/browser-esm-vite/main.ts, monaco-lsp-client/generator/index.ts.

What it can do

  • Highlight code syntax

    Source code text → Syntax-highlighted code with color coding

  • Provide code completion suggestions

    Partially typed code → List of relevant code completion options

  • Display hover information for code elements

    Code symbol or function → Type information, documentation, and parameter details

  • Find and replace text in code

    Search term and replacement text → Modified code with replacements applied

  • Format and indent code automatically

    Unformatted source code → Properly formatted and indented code

  • Validate code and show error markers

    Source code with potential errors → Visual error indicators and diagnostic messages

  • Navigate to symbol definitions

    Code symbol or function reference → Jump to declaration or definition location

Tags

editormonacobrowseride-componentmicrosoft

Tech Stack

Node.js

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