Fabian Hiller
@fabianhiller.com
TypeScript expert w/ 100M+ monthly npm downloads. Creator of @valibot.dev & @formisch.dev, co-creator of https://standardschema.dev and engineer at https://usemotion.com
Pinned
Introducing Open Circle
A few months ago, we moved the Valibot and Formisch repositories from Fabian's personal GitHub account into the Open Circle organization. This post explains what Open Circle is, why we made this chang...
valibot.dev
Introducing Open Circle – powering the next chapter of @valibot.dev and @formisch.dev 🌀
✅ Direct community sponsorships
✅ Transparent open source funding
✅ Community-driven development
Full details here: valibot.dev/blog/introdu...
✅ Direct community sponsorships
✅ Transparent open source funding
✅ Community-driven development
Full details here: valibot.dev/blog/introdu...
Reposted by Fabian Hiller
What's @fabianhiller.com's latest project? Formish, framework agnostic forms.
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
February 6, 2026 at 4:04 PM
What's @fabianhiller.com's latest project? Formish, framework agnostic forms.
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
Reposted by Fabian Hiller
What do LLMs do with validation libraries? It turns out a whole lot!
More with @fabianhiller.com on our latest ep
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
More with @fabianhiller.com on our latest ep
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
February 4, 2026 at 4:03 PM
What do LLMs do with validation libraries? It turns out a whole lot!
More with @fabianhiller.com on our latest ep
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
More with @fabianhiller.com on our latest ep
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
1,018,266 downloads in ONE DAY for @valibot.dev! 📈
Thank you! This little schema library means a lot to me, and seeing this support is unreal! 🙏
Let’s keep building safer, lighter TS apps together. v1.3 coming soon with even more goodies. 🔧
Thank you! This little schema library means a lot to me, and seeing this support is unreal! 🙏
Let’s keep building safer, lighter TS apps together. v1.3 coming soon with even more goodies. 🔧
February 4, 2026 at 3:00 PM
1,018,266 downloads in ONE DAY for @valibot.dev! 📈
Thank you! This little schema library means a lot to me, and seeing this support is unreal! 🙏
Let’s keep building safer, lighter TS apps together. v1.3 coming soon with even more goodies. 🔧
Thank you! This little schema library means a lot to me, and seeing this support is unreal! 🙏
Let’s keep building safer, lighter TS apps together. v1.3 coming soon with even more goodies. 🔧
Maybe our new StandardJSONSchema spec could solve that: standardschema.dev
Standard Schema
A family of specs for interoperable TypeScript
standardschema.dev
February 3, 2026 at 9:37 PM
Maybe our new StandardJSONSchema spec could solve that: standardschema.dev
Thrilled to be on @devtools.fm talking Valibot's origins, the Standard Schema collab with Zod/ArkType creators, launching Formisch, and why AI needs better schema metadata!
If schema validation, forms, or future dev tools excite you – this one's for you 👀
www.youtube.com/watch?v=WpHI...
If schema validation, forms, or future dev tools excite you – this one's for you 👀
www.youtube.com/watch?v=WpHI...
Fabian Hiller - Valibot, Standard Schema, Formish
YouTube video by devtools-fm
www.youtube.com
February 2, 2026 at 6:20 PM
Thrilled to be on @devtools.fm talking Valibot's origins, the Standard Schema collab with Zod/ArkType creators, launching Formisch, and why AI needs better schema metadata!
If schema validation, forms, or future dev tools excite you – this one's for you 👀
www.youtube.com/watch?v=WpHI...
If schema validation, forms, or future dev tools excite you – this one's for you 👀
www.youtube.com/watch?v=WpHI...
Check it out! 👀
What's unique about valibot?
Find out on our latest episode with it's creator @fabianhiller.com
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
Find out on our latest episode with it's creator @fabianhiller.com
www.youtube.com/watch?v=WpHI...
open.spotify.com/episode/3M78...
February 2, 2026 at 6:06 PM
Check it out! 👀
What do you think? Loving it? Hating something?
Brutally honest feedback welcome — let’s make this the form library that finally fixes the JavaScript form game for good. 🙌
formisch.dev
Brutally honest feedback welcome — let’s make this the form library that finally fixes the JavaScript form game for good. 🙌
formisch.dev
Formisch: The modular and type-safe form library for any framework
Formisch is a schema-based, headless form library for JS frameworks. It manages form state and validation. It is type-safe, fast by default and its bundle size is small due to its modular design.
formisch.dev
February 2, 2026 at 6:05 PM
What do you think? Loving it? Hating something?
Brutally honest feedback welcome — let’s make this the form library that finally fixes the JavaScript form game for good. 🙌
formisch.dev
Brutally honest feedback welcome — let’s make this the form library that finally fixes the JavaScript form game for good. 🙌
formisch.dev
Who’s actually tried @formisch.dev so far? 👀🧱
This is the kind of clean, type-safe form code you get in React, SolidJS, Vue, Svelte and co — schema-powered, headless, stupidly small bundle size. 🪄
This is the kind of clean, type-safe form code you get in React, SolidJS, Vue, Svelte and co — schema-powered, headless, stupidly small bundle size. 🪄
February 2, 2026 at 6:05 PM
Who’s actually tried @formisch.dev so far? 👀🧱
This is the kind of clean, type-safe form code you get in React, SolidJS, Vue, Svelte and co — schema-powered, headless, stupidly small bundle size. 🪄
This is the kind of clean, type-safe form code you get in React, SolidJS, Vue, Svelte and co — schema-powered, headless, stupidly small bundle size. 🪄
I build something with @convex.dev, @tanstack.com start, @shadcn.com, @valibot.dev and @formisch.dev this weekend. It was fun!
February 2, 2026 at 3:56 AM
I build something with @convex.dev, @tanstack.com start, @shadcn.com, @valibot.dev and @formisch.dev this weekend. It was fun!
If you build React forms and hate fighting state/validation — give Formisch a spin. I genuinely think it's the future. 🌱
Try it: formisch.dev/react/guides...
Try it: formisch.dev/react/guides...
Introduction
Formisch is a schema-based, headless form library for React. It manages form state and validation. It is type-safe, fast by default and its bundle size is small due to its modular design.
formisch.dev
February 2, 2026 at 3:53 AM
If you build React forms and hate fighting state/validation — give Formisch a spin. I genuinely think it's the future. 🌱
Try it: formisch.dev/react/guides...
Try it: formisch.dev/react/guides...
Just shipped fresh improvements to the @react.dev version of @formisch.dev this weekend! 🚀
Better integration, smoother APIs, and of course full type-safety + tiny bundle size. ⚡️
Better integration, smoother APIs, and of course full type-safety + tiny bundle size. ⚡️
February 2, 2026 at 3:53 AM
Just shipped fresh improvements to the @react.dev version of @formisch.dev this weekend! 🚀
Better integration, smoother APIs, and of course full type-safety + tiny bundle size. ⚡️
Better integration, smoother APIs, and of course full type-safety + tiny bundle size. ⚡️
We just added onInput/onChange props to @formisch.dev's field hook & component. Now, integrating custom UI libs (like date pickers) is a breeze! 🪄
Check out this seamless example:
Check out this seamless example:
January 31, 2026 at 4:14 PM
We just added onInput/onChange props to @formisch.dev's field hook & component. Now, integrating custom UI libs (like date pickers) is a breeze! 🪄
Check out this seamless example:
Check out this seamless example:
@vuejs.org fam, huge thank you! 🙏
The Vue community is showing some love for @formisch.dev lately 📈
Schema-based, type-safe, headless form library for Vue — clean, fast, and developer-friendly 🧱
#VueJS #Vue3 #TypeScript #Forms
The Vue community is showing some love for @formisch.dev lately 📈
Schema-based, type-safe, headless form library for Vue — clean, fast, and developer-friendly 🧱
#VueJS #Vue3 #TypeScript #Forms
January 29, 2026 at 5:02 PM
@vuejs.org fam, huge thank you! 🙏
The Vue community is showing some love for @formisch.dev lately 📈
Schema-based, type-safe, headless form library for Vue — clean, fast, and developer-friendly 🧱
#VueJS #Vue3 #TypeScript #Forms
The Vue community is showing some love for @formisch.dev lately 📈
Schema-based, type-safe, headless form library for Vue — clean, fast, and developer-friendly 🧱
#VueJS #Vue3 #TypeScript #Forms
🤏 soooo close to 1M npm downloads on a single day!
January 28, 2026 at 8:53 PM
🤏 soooo close to 1M npm downloads on a single day!
That's very strange. I would love to know where it is coming from. Is Zod still bundled somehow?
January 27, 2026 at 7:45 PM
That's very strange. I would love to know where it is coming from. Is Zod still bundled somehow?
Cool! 🙌 If you're interested, you could add a dedicated migration skill to our repository with all the learnings.
valibot.dev/guides/migra...
valibot.dev/guides/migra...
Migrate from Zod
Migrating from Zod to Valibot is very easy in most cases since both APIs have a lot of similarities.
valibot.dev
January 27, 2026 at 5:37 PM
Cool! 🙌 If you're interested, you could add a dedicated migration skill to our repository with all the learnings.
valibot.dev/guides/migra...
valibot.dev/guides/migra...
Big thanks to @flysewa.bsky.social for crafting this announcement post and for leading our content work at Open Circle! 🦋
January 27, 2026 at 3:13 PM
Big thanks to @flysewa.bsky.social for crafting this announcement post and for leading our content work at Open Circle! 🦋
January 27, 2026 at 3:09 PM
Introducing Open Circle – powering the next chapter of @valibot.dev and @formisch.dev 🌀
✅ Direct community sponsorships
✅ Transparent open source funding
✅ Community-driven development
Full details here: valibot.dev/blog/introdu...
✅ Direct community sponsorships
✅ Transparent open source funding
✅ Community-driven development
Full details here: valibot.dev/blog/introdu...
Introducing Open Circle
A few months ago, we moved the Valibot and Formisch repositories from Fabian's personal GitHub account into the Open Circle organization. This post explains what Open Circle is, why we made this chang...
valibot.dev
January 27, 2026 at 3:09 PM
Introducing Open Circle – powering the next chapter of @valibot.dev and @formisch.dev 🌀
✅ Direct community sponsorships
✅ Transparent open source funding
✅ Community-driven development
Full details here: valibot.dev/blog/introdu...
✅ Direct community sponsorships
✅ Transparent open source funding
✅ Community-driven development
Full details here: valibot.dev/blog/introdu...
What do you think? Suggestions for improvements or new skills? Contributions very welcome! 👇
#AgentSkills #TypeScript #OpenSource #Valibot #Formisch
#AgentSkills #TypeScript #OpenSource #Valibot #Formisch
January 27, 2026 at 5:24 AM
What do you think? Suggestions for improvements or new skills? Contributions very welcome! 👇
#AgentSkills #TypeScript #OpenSource #Valibot #Formisch
#AgentSkills #TypeScript #OpenSource #Valibot #Formisch
🛠️ AI agent builders – fresh drop!
We just launched a dedicated Agent Skills GitHub repo packed with ready-to-use skills for @valibot.dev and @formisch.dev 🔥
Your agents can now handle modular, type-safe validation + advanced forms effortlessly 🧩
Check it out & try them: github.com/open-circle/...
We just launched a dedicated Agent Skills GitHub repo packed with ready-to-use skills for @valibot.dev and @formisch.dev 🔥
Your agents can now handle modular, type-safe validation + advanced forms effortlessly 🧩
Check it out & try them: github.com/open-circle/...
GitHub - open-circle/agent-skills: Public repository for Agent Skills
Public repository for Agent Skills. Contribute to open-circle/agent-skills development by creating an account on GitHub.
github.com
January 27, 2026 at 5:24 AM
🛠️ AI agent builders – fresh drop!
We just launched a dedicated Agent Skills GitHub repo packed with ready-to-use skills for @valibot.dev and @formisch.dev 🔥
Your agents can now handle modular, type-safe validation + advanced forms effortlessly 🧩
Check it out & try them: github.com/open-circle/...
We just launched a dedicated Agent Skills GitHub repo packed with ready-to-use skills for @valibot.dev and @formisch.dev 🔥
Your agents can now handle modular, type-safe validation + advanced forms effortlessly 🧩
Check it out & try them: github.com/open-circle/...
Soon: native client ↔ server communication to make the DX even smoother (no more manual sync headaches) – Stay tuned! 🧩
What are you building with it first? Drop your stack below 👇
#React #TypeScript #Forms #Nextjs #WebDev
What are you building with it first? Drop your stack below 👇
#React #TypeScript #Forms #Nextjs #WebDev
January 26, 2026 at 9:54 PM
Soon: native client ↔ server communication to make the DX even smoother (no more manual sync headaches) – Stay tuned! 🧩
What are you building with it first? Drop your stack below 👇
#React #TypeScript #Forms #Nextjs #WebDev
What are you building with it first? Drop your stack below 👇
#React #TypeScript #Forms #Nextjs #WebDev