Embeddable Signup Form

Embed a Ghost signup form on any site.

Development

Pre-requisites

• Run pnpm setup in the Ghost monorepo root

Running via Ghost from the monorepo root

Start Ghost with the public-app watchers enabled:

pnpm dev:public

This starts the standard development environment and the Signup Form watcher.

Running the standalone demo page

Run pnpm dev:standalone from this directory to start the standalone development server with HMR. It serves the demo page at http://localhost:6173.

pnpm dev on its own (in this package folder) only builds umd/signup-form.min.js and watches for changes — it does not bind a port. The UMD is served by Caddy at http://localhost:2368/ghost/assets/signup-form/signup-form.min.js when you run pnpm dev:public from the monorepo root.

Using the UMD build during development

Vite's development server uses an ESM output for HMR. When a script is loaded as an ESM module (<script type="module" src="...">), document.currentScript is not available. Signup Form needs it to determine where to inject the iframe, so development mode uses a workaround that is not suitable for production.

To test the production behavior, open http://localhost:6173/preview.html while pnpm dev:standalone is running. The page loads the UMD bundle from the development gateway, so pnpm dev:public must also be running from the monorepo root.

Test

• pnpm lint runs ESLint.
• pnpm test:acceptance runs acceptance tests on Chromium.
• pnpm test:acceptance:slowmo runs acceptance tests headed and slowed down on Chromium.
• pnpm test:acceptance:full runs acceptance tests on all configured browsers.

Release

Patch releases are automatic. When Signup Form changes on main, CI publishes the next patch version to npm and clears the jsDelivr cache. Sites using that major/minor line receive the patch without a Ghost release.

For an intentional minor or major release:

1. From a clean branch, run pnpm ship and select a minor or major version
2. Merge the release commit to main
3. Wait for a public Ghost release to ship the new default version line

pnpm ship updates both the package version and Ghost's default Signup Form version.

Copyright & License

Copyright (c) 2013-2026 Ghost Foundation - Released under the MIT license.