Figma Plugin Development

Build plugins that extend Figma's functionality using the Plugin API.

Architecture

Figma plugins run in two threads communicating via postMessage:

• Main thread (sandbox): Plugin API access, node manipulation, figma.* calls
• UI thread (iframe): HTML/CSS/JS interface, no Figma API access, npm packages allowed

Key Principles

• Main thread handles all Figma document operations
• UI thread handles user interface and external APIs
• Communication between threads via figma.ui.postMessage() and onmessage
• Plugins must be performant — avoid blocking the main thread

Quick Start Checklist

1. Set up project with manifest.json (name, id, main, ui)
2. Create main thread code (code.ts) with plugin logic
3. Create UI (ui.html) with interface elements
4. Wire up postMessage communication between threads
5. Test in Figma development mode
6. Publish via Figma Community

References