Superforms 💥

Making SvelteKit forms a pleasure to use!

https://superforms.rocks/
Discord • API • FAQ • npm • Issues

Feature list

Server- and client-side validation with your favorite validation libraries, and more to come: 💥 Arktype 💥 Joi 💥 TypeBox 💥 Valibot 💥 VineJS 💥 Yup 💥 Zod 💥
Seamless merging of PageData and ActionData - Forget about which one to use and how, just focus on your form data.
Auto-centering and focusing on invalid form fields.
Tainted form detection, prevents the user from losing data if navigating away from an unsaved form. Or use snapshots to save the form state.
Automatically coerces the FormData into correct types.
For advanced data structures, forget about the limitations of FormData - Use nested data structures transparently.
Generates default form values from validation schemas.
Handles multiple forms on the same page.
Works both on the server and with single-page applications (SPA)!
Proxy objects for handling data conversions to string and back again.
Realtime client-side validation for the best possible UX.
Create loading spinners easily with three auto-updating timers, based on human perception research.
Hook into a number of events for full control over the validation data and the ActionResult, with a possibility to cancel the update at every step.
Complete customization with a huge list of options.
No JavaScript required as default, but full support for progressive enhancement.
Comes with a Super Debugging Svelte Component: SuperDebug.

Follow the Get started tutorial on the website to get a hands-on introduction to Superforms: https://superforms.rocks/get-started

You can also watch this excellent introduction video to see what's possible: https://www.youtube.com/watch?v=MiKzH3kcVfs

If you're using Superforms in non-profit circumstances, support is completely free; a star on Github is more than enough to show your appreciation. Join the #free-support channel on Discord and ask away!
If you're making or aiming to make money on your project, a donation proportional to the current profit of the project or the company you work for, will give you a month of commercial support. Donate with one of the options on the website, then ask in the #commercial-support channel on Discord.

General feedback, feature requests, bug reports, PR:s, are very welcome as a Github issue or on the Discord server!

If you appreciate the hard work behind Superforms, please support open source software with a donation.