React devtools panel

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React DevTools Panel Example

Adds a React devtools panel to the browser that reads the inspected page.

What you'll see: A panel inside the browser DevTools, reading the inspected page.

How it works: The manifest registers a devtools_page, which has no UI of its own: its only job is to call chrome.devtools.panels.create. The panel it registers is a React + TypeScript page bundled from src/panel/.

Try it locally

npx extension@latest create my-devtools-react --template devtools-react
cd my-devtools-react
npm install
npm run dev

A fresh browser window opens with the extension already loaded.

Project layout

src/
├── devtools/
│   ├── index.html
│   └── scripts.js
├── images/
│   ├── icon-128.png
│   ├── icon-16.png
│   ├── icon-32.png
│   ├── icon-48.png
│   ├── icon-64.png
│   ├── icon.png
│   └── react.png
├── panel/
│   ├── index.html
│   ├── PanelApp.tsx
│   ├── scripts.tsx
│   └── styles.css
└── manifest.json

Commands

Cloned this repo instead? The examples ship without npm scripts, so run Extension.js directly from the example directory. Run npm install first when the example declares dependencies.

dev

Run the extension in development mode. Target a browser with --browser:

npx extension@latest dev .                  # Chromium (default)
npx extension@latest dev . --browser=chrome
npx extension@latest dev . --browser=edge
npx extension@latest dev . --browser=firefox

build

Build for production:

npx extension@latest build .                # Chromium (default)
npx extension@latest build . --browser=firefox
npx extension@latest build . --browser=edge

preview

Preview the production build with the bundled browser:

npx extension@latest preview .

Tests

This template ships an end-to-end check (template.spec.ts) validated by the examples-repo CI on every commit.

Learn more

• Extension.js docs
• Templates index
• GitHub: extension-js/extension.js