Embeddable Signup Form

Embed a Ghost signup form on any site.

Development

Pre-requisites

• Run pnpm in Ghost monorepo root
• Run pnpm in this directory

Running via Ghost pnpm dev in root folder

Signup Form runs automatically when using Ghost's development command from the monorepo root:

pnpm dev

This starts all frontend apps (including Signup Form.)

Running the standalone demo page

Run pnpm dev:standalone (in this package folder) to start the standalone development server with HMR for testing/developing the form in isolation.

• This 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 from the monorepo root.

Using the UMD build during development

Vite by default only supports HRM with an ESM output. But when loading a script on a site as a ESM module (<script type="module" src="...">), you don't have access to document.currentScript inside the script, which is required to determine the location to inject the iframe. In development mode we use a workaround for this to make the ESM HMR work. But this workaround is not suitable for production.

To test the real production behaviour without this hack, you can use http://localhost:6173/preview.html (served by pnpm dev:standalone). The page loads the production UMD via <script src="http://localhost:2368/ghost/assets/signup-form/signup-form.min.js">, which is served by Caddy when pnpm dev is also running from the monorepo root. Both processes need to be up at the same time.

Develop

This is a monorepo package.

Follow the instructions for the top-level repo.

1. git clone this repo & cd into it as usual
2. Run pnpm to install top-level dependencies.

Test

• pnpm lint run just eslint
• pnpm test run lint and tests
• pnpm test:e2e run e2e tests on Chromium
• pnpm test:slowmo run e2e tests visually (headed) and slower on Chromium
• pnpm test:e2e:full run e2e tests on all browsers

Release

A patch release can be rolled out instantly in production, whereas a minor/major release requires the Ghost monorepo to be updated and released. In either case, you need sufficient permissions to release @tryghost packages on NPM.

Patch release

1. Run pnpm ship and select a patch version when prompted
2. Merge the release commit to main

Minor / major release

1. Run pnpm ship and select a minor or major version when prompted
2. Merge the release commit to main
3. Wait until a new version of Ghost is released

To use the new version of signup form in Ghost, update the version in Ghost core's default configuration (currently at core/shared/config/default.json)

Copyright & License

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