fabian-hiller/modular-forms

The modular and type-safe form library for SolidJS, Qwik and Preact

TypeScript

1,210

597 commits

updated Jun 6, 2026

See the code

README

Modular Forms

Modular Forms is a JavaScript library built on SolidJS, Qwik, Preact and React to validate and handle various types of forms. It is type-safe, fast by default and the bundle size is small due to a modular design. Try it out in our playground!

Important: Modular Forms is in maintenance mode. We recommend Formisch, its official successor, for new projects.

✨ Highlights

  • Small bundle size starting at 3 KB
  • It's fast – DOM updates are fine-grained
  • Type safety with autocompletion in editor
  • Validate everything from emails to files
  • Minimal, readable and well thought out API
  • Progressively enhanced forms with actions
  • Modular design – only use what you need
  • No dependencies – except for the framework
  • It's headless – you define the visual
  • Supports all native HTML form fields

🏔 Mission

The mission of Modular Forms is to gather the latest available experience and knowledge to provide the best possible form library for JavaScript frameworks. We pay special attention to type safety, bundle size, performance and input validation. You can expect that every decision we make during development is well thought out and always takes these main features into account.

🪐 Vision

At the time of the initial development of Modular Forms, there was no form library with comparable type safety, bundle size and performance. However, many of the ideas came from previous open source projects and only the development of the last few years has made a form library in this way possible. The vision of Modular Forms is to shape the future of the web together and to share our knowledge and experience with the open source community.

🙌🏼 Credits

When creating Modular Forms, I took inspiration from React Hook Form and Formik. I also want to thank Ryan Carniato for his inspiring streams with exclusive and deep insights into different technologies. Furthermore, I would like to thank David Di Biase, Miško Hevery and Manu Martínez-Almeida for the support I received during the initial development.

✏️ Feedback

Find a bug or have an idea how to improve the library? Please fill out an issue. Together we can make the library even better!

🔑 License

This project is available free of charge and licensed under the MIT License.

bundle-size
form
forms
form-validation
performance
preact
qwik
signals
solid
type-safe
typescript
validation

Significant stargazers

Jesse Talavera

275 followers · starred Aug 2026

Adam Haglund

145 followers · starred Oct 2024

Oscar Beaumont

414 followers · starred May 2025

Wout Mertens

176 followers · starred Feb 2023

fabian-hiller/modular-forms

The modular and type-safe form library for SolidJS, Qwik and Preact

TypeScript

1,210

597 commits

updated Jun 6, 2026

See the code

README

Modular Forms

Modular Forms is a JavaScript library built on SolidJS, Qwik, Preact and React to validate and handle various types of forms. It is type-safe, fast by default and the bundle size is small due to a modular design. Try it out in our playground!

Important: Modular Forms is in maintenance mode. We recommend Formisch, its official successor, for new projects.

✨ Highlights

  • Small bundle size starting at 3 KB
  • It's fast – DOM updates are fine-grained
  • Type safety with autocompletion in editor
  • Validate everything from emails to files
  • Minimal, readable and well thought out API
  • Progressively enhanced forms with actions
  • Modular design – only use what you need
  • No dependencies – except for the framework
  • It's headless – you define the visual
  • Supports all native HTML form fields

🏔 Mission

The mission of Modular Forms is to gather the latest available experience and knowledge to provide the best possible form library for JavaScript frameworks. We pay special attention to type safety, bundle size, performance and input validation. You can expect that every decision we make during development is well thought out and always takes these main features into account.

🪐 Vision

At the time of the initial development of Modular Forms, there was no form library with comparable type safety, bundle size and performance. However, many of the ideas came from previous open source projects and only the development of the last few years has made a form library in this way possible. The vision of Modular Forms is to shape the future of the web together and to share our knowledge and experience with the open source community.

🙌🏼 Credits

When creating Modular Forms, I took inspiration from React Hook Form and Formik. I also want to thank Ryan Carniato for his inspiring streams with exclusive and deep insights into different technologies. Furthermore, I would like to thank David Di Biase, Miško Hevery and Manu Martínez-Almeida for the support I received during the initial development.

✏️ Feedback

Find a bug or have an idea how to improve the library? Please fill out an issue. Together we can make the library even better!

🔑 License

This project is available free of charge and licensed under the MIT License.

bundle-size
form
forms
form-validation
performance
preact
qwik
signals
solid
type-safe
typescript
validation

Significant stargazers

Jesse Talavera

275 followers · starred Aug 2026

Adam Haglund

145 followers · starred Oct 2024

Oscar Beaumont

414 followers · starred May 2025

Wout Mertens

176 followers · starred Feb 2023

Languages

TypeScript

75.9%

MDX

23.0%