Build from source

DevFiller is open source under the MIT license.

Run it locally

git clone https://github.com/gouderhaithem/form-filler.git
cd form-filler
npm ci
npm run dev        # options preview and demo forms at http://127.0.0.1:5187

Page	What it's for
/	The options page next to a working demo form
/welcome.html	The first-install welcome page
/demo.html	A mixed-language form to test the installed extension on
/dynamic-form.html	A form that reveals fields after filling

Build, test and package

npm run build              # type-check and build the extension into dist/
npm test                   # unit tests
npx playwright install chromium
npm run test:e2e           # the real extension in Chromium
npm run package            # release/devfiller-<version>.zip for the Chrome Web Store
npm run store-assets       # store screenshots and promo tile

Browser tests load the built extension in a throwaway profile and cover toolbar filling, the side panel, settings, exclusions, forms that change, and the AI cache. AI providers are simulated.

Where things are

Path	What it holds
public/manifest.json	Permissions, entry points and icons
src/background.ts	Toolbar action, AI preparation and cache
src/engine.ts	Field detection and filling
src/data.ts, src/samples.ts	The generator and its samples in three languages
src/gemini.ts	Groq and Gemini requests
src/sidepanel.tsx, src/panel-page.ts	Side panel and undo
src/main.tsx	The options page
website/	This website

Contributing

Bug reports and pull requests are welcome on GitHub. For a bug, include your browser version, the steps, and a small example form with fictional data. Run the build and both test suites before opening a pull request.