Fabian Hiller
@fabianhiller.com
Creator of @valibot.dev, creator of Formisch, co-creator of https://standardschema.dev and engineer at https://usemotion.com
Thank you for using @valibot.dev and @formisch.dev 🙏
January 16, 2026 at 3:29 PM
Thank you for using @valibot.dev and @formisch.dev 🙏
The core package of 🧱 @formisch.dev will soon have 100% test coverage. Use context7.com or feed your LLM directly with our LLMs.txt and give it a try! Formisch is available for all common JS frameworks including @react.dev.
January 10, 2026 at 9:55 PM
The core package of 🧱 @formisch.dev will soon have 100% test coverage. Use context7.com or feed your LLM directly with our LLMs.txt and give it a try! Formisch is available for all common JS frameworks including @react.dev.
The Tailwind situation is a tough reminder: Sustaining high-quality OSS is incredibly hard when your focus is purely on making the open source part better, without a SaaS/business layer to fund it. AI accelerates that pressure by reducing doc traffic and paid conversions.
January 8, 2026 at 2:51 PM
The Tailwind situation is a tough reminder: Sustaining high-quality OSS is incredibly hard when your focus is purely on making the open source part better, without a SaaS/business layer to fund it. AI accelerates that pressure by reducing doc traffic and paid conversions.
Reposted by Fabian Hiller
Apparently I picked a fitting moment to publish this.
I’ve been working with @tannerlinsley.com on performance improvements for @tanstack.com, and a main topic was how ads affect performance.
I wrote a post about it and the tradeoffs with OSS projects.
sarahgerrard.me/posts/ads-an...
I’ve been working with @tannerlinsley.com on performance improvements for @tanstack.com, and a main topic was how ads affect performance.
I wrote a post about it and the tradeoffs with OSS projects.
sarahgerrard.me/posts/ads-an...
Ads as a Performance Budget Problem - Sarah Gerrard
Exploring how ads impact website performance and strategies to manage their effects.
sarahgerrard.me
January 7, 2026 at 11:12 PM
Apparently I picked a fitting moment to publish this.
I’ve been working with @tannerlinsley.com on performance improvements for @tanstack.com, and a main topic was how ads affect performance.
I wrote a post about it and the tradeoffs with OSS projects.
sarahgerrard.me/posts/ads-an...
I’ve been working with @tannerlinsley.com on performance improvements for @tanstack.com, and a main topic was how ads affect performance.
I wrote a post about it and the tradeoffs with OSS projects.
sarahgerrard.me/posts/ads-an...
2025 Formisch year in review 🎆
🆕 Releases: Initial launch for @solidjs.com, @qwik.dev, @preactjs.com and @vuejs.org in July, followed by @svelte.dev in September and @react.dev in December
🆕 Releases: Initial launch for @solidjs.com, @qwik.dev, @preactjs.com and @vuejs.org in July, followed by @svelte.dev in September and @react.dev in December
January 7, 2026 at 3:03 PM
2025 Formisch year in review 🎆
🆕 Releases: Initial launch for @solidjs.com, @qwik.dev, @preactjs.com and @vuejs.org in July, followed by @svelte.dev in September and @react.dev in December
🆕 Releases: Initial launch for @solidjs.com, @qwik.dev, @preactjs.com and @vuejs.org in July, followed by @svelte.dev in September and @react.dev in December
The @valibot.dev and @formisch.dev docs now includes a button that allows you to access the raw Markdown content of each page. This is useful for providing your LLM with additional context. 🤖
January 7, 2026 at 2:18 AM
The @valibot.dev and @formisch.dev docs now includes a button that allows you to access the raw Markdown content of each page. This is useful for providing your LLM with additional context. 🤖
Who should try @valibot.dev this year? Tag your friends!
January 6, 2026 at 7:59 PM
Who should try @valibot.dev this year? Tag your friends!
2025 @valibot.dev year in review 🎆
🆕 New releases: v1 RC (Feb), v1 stable (Mar), v1.1 (May), v1.2 (Nov)
🔋 Major features: Stable pipe API, many new validation and transformation actions (slug(), gtValue(), toNumber(), etc.), metadata features for AI
🆕 New releases: v1 RC (Feb), v1 stable (Mar), v1.1 (May), v1.2 (Nov)
🔋 Major features: Stable pipe API, many new validation and transformation actions (slug(), gtValue(), toNumber(), etc.), metadata features for AI
January 6, 2026 at 3:15 PM
2025 @valibot.dev year in review 🎆
🆕 New releases: v1 RC (Feb), v1 stable (Mar), v1.1 (May), v1.2 (Nov)
🔋 Major features: Stable pipe API, many new validation and transformation actions (slug(), gtValue(), toNumber(), etc.), metadata features for AI
🆕 New releases: v1 RC (Feb), v1 stable (Mar), v1.1 (May), v1.2 (Nov)
🔋 Major features: Stable pipe API, many new validation and transformation actions (slug(), gtValue(), toNumber(), etc.), metadata features for AI
Thinking about switching from Zod to Valibot in 2026?
Our official codemod can automate most of the migration for you (imports + basic schema conversions). 🪄
npx @valibot/zod-to-valibot src/**/*
Our official codemod can automate most of the migration for you (imports + basic schema conversions). 🪄
npx @valibot/zod-to-valibot src/**/*
January 5, 2026 at 4:11 PM
Thinking about switching from Zod to Valibot in 2026?
Our official codemod can automate most of the migration for you (imports + basic schema conversions). 🪄
npx @valibot/zod-to-valibot src/**/*
Our official codemod can automate most of the migration for you (imports + basic schema conversions). 🪄
npx @valibot/zod-to-valibot src/**/*
I updated the comparison in the @valibot.dev docs to include @rolldown.rs. The new numbers with Rolldown are as follows:
🤖 Valibot: 1.34 kB
💎 Zod: 15.18 kB
💎 Zod Mini: 3.94 kB
🤖 Valibot: 1.34 kB
💎 Zod: 15.18 kB
💎 Zod Mini: 3.94 kB
Just updated the @valibot.dev comparison guide to also including the new Zod Mini.
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
January 4, 2026 at 8:31 PM
I updated the comparison in the @valibot.dev docs to include @rolldown.rs. The new numbers with Rolldown are as follows:
🤖 Valibot: 1.34 kB
💎 Zod: 15.18 kB
💎 Zod Mini: 3.94 kB
🤖 Valibot: 1.34 kB
💎 Zod: 15.18 kB
💎 Zod Mini: 3.94 kB
Should we drop a dedicated open-source project comparing ALL major schema libs? 🤔
We could test:
⏱️ Initialization speed
✅ Validation speed
⚡ Parsing speed
📦 Download time (bundle size)
If this gets traction… we launch it 🚀📊
We could test:
⏱️ Initialization speed
✅ Validation speed
⚡ Parsing speed
📦 Download time (bundle size)
If this gets traction… we launch it 🚀📊
Just updated the @valibot.dev comparison guide to also including the new Zod Mini.
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
January 4, 2026 at 6:48 PM
Should we drop a dedicated open-source project comparing ALL major schema libs? 🤔
We could test:
⏱️ Initialization speed
✅ Validation speed
⚡ Parsing speed
📦 Download time (bundle size)
If this gets traction… we launch it 🚀📊
We could test:
⏱️ Initialization speed
✅ Validation speed
⚡ Parsing speed
📦 Download time (bundle size)
If this gets traction… we launch it 🚀📊
Just updated the @valibot.dev comparison guide to also including the new Zod Mini.
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
January 3, 2026 at 6:27 PM
Just updated the @valibot.dev comparison guide to also including the new Zod Mini.
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
Bundle sizes for a typical login schema:
🤖 Valibot: 1.37 kB
💎 Zod: 17.7 kB
💎 Zod Mini: 6.88 kB
Cheers to 2026! 🥂 Grateful for the growth of Valibot, Standard Schema and Formisch this year. Looking forward to new features and better DX. Thank you all! 🙏
January 2, 2026 at 3:26 PM
Cheers to 2026! 🥂 Grateful for the growth of Valibot, Standard Schema and Formisch this year. Looking forward to new features and better DX. Thank you all! 🙏
Big milestone: @formisch.dev crossed 500 GitHub stars! ⭐
Formisch is a schema-based form library offering native performance, a tiny bundle size and full type safety. 🧱
Huge thanks to the community! Try Formisch today with React, Solid, Svelte, Qwik, Preact or Vue.
Formisch is a schema-based form library offering native performance, a tiny bundle size and full type safety. 🧱
Huge thanks to the community! Try Formisch today with React, Solid, Svelte, Qwik, Preact or Vue.
December 17, 2025 at 12:43 PM
Big milestone: @formisch.dev crossed 500 GitHub stars! ⭐
Formisch is a schema-based form library offering native performance, a tiny bundle size and full type safety. 🧱
Huge thanks to the community! Try Formisch today with React, Solid, Svelte, Qwik, Preact or Vue.
Formisch is a schema-based form library offering native performance, a tiny bundle size and full type safety. 🧱
Huge thanks to the community! Try Formisch today with React, Solid, Svelte, Qwik, Preact or Vue.
Excited to announce Standard JSON Schema! 🔥
We launched Standard Schema ~1 year ago, and it's been a massive success—adopted across the ecosystem with libraries like @zod.dev, @valibot.dev, and @arktype.io leading the way.
We launched Standard Schema ~1 year ago, and it's been a massive success—adopted across the ecosystem with libraries like @zod.dev, @valibot.dev, and @arktype.io leading the way.
December 16, 2025 at 7:47 PM
Excited to announce Standard JSON Schema! 🔥
We launched Standard Schema ~1 year ago, and it's been a massive success—adopted across the ecosystem with libraries like @zod.dev, @valibot.dev, and @arktype.io leading the way.
We launched Standard Schema ~1 year ago, and it's been a massive success—adopted across the ecosystem with libraries like @zod.dev, @valibot.dev, and @arktype.io leading the way.
Standard JSON Schema is out 🔥
For @valibot.dev v1.3, I will look into implementing the spec into the core package via a side-effect import. The goal is to improve the DX while maintaining Valibot’s small, tree-shakable bundle size. 🧩
For @valibot.dev v1.3, I will look into implementing the spec into the core package via a side-effect import. The goal is to improve the DX while maintaining Valibot’s small, tree-shakable bundle size. 🧩
Introducing ✨ Standard JSON Schema ✨
It's a sister spec to Standard Schema that provides a common interface for any entity that can be converted to JSON Schema
It's a sister spec to Standard Schema that provides a common interface for any entity that can be converted to JSON Schema
December 16, 2025 at 10:04 AM
Standard JSON Schema is out 🔥
For @valibot.dev v1.3, I will look into implementing the spec into the core package via a side-effect import. The goal is to improve the DX while maintaining Valibot’s small, tree-shakable bundle size. 🧩
For @valibot.dev v1.3, I will look into implementing the spec into the core package via a side-effect import. The goal is to improve the DX while maintaining Valibot’s small, tree-shakable bundle size. 🧩
The React docs for Formisch are up: formisch.dev/react/guides...
December 8, 2025 at 1:14 PM
The React docs for Formisch are up: formisch.dev/react/guides...
Formisch is blowing up! 🤯 Thank you all for the overwhelming love and support.
We’re quietly chasing 1,000 stars before the year ends. If you haven’t starred yet, now’s the perfect time! 😇
github.com/open-circle/...
We’re quietly chasing 1,000 stars before the year ends. If you haven’t starred yet, now’s the perfect time! 😇
github.com/open-circle/...
December 6, 2025 at 9:11 PM
Formisch is blowing up! 🤯 Thank you all for the overwhelming love and support.
We’re quietly chasing 1,000 stars before the year ends. If you haven’t starred yet, now’s the perfect time! 😇
github.com/open-circle/...
We’re quietly chasing 1,000 stars before the year ends. If you haven’t starred yet, now’s the perfect time! 😇
github.com/open-circle/...
@formisch.dev hit 6,000 docs views in 30 days 😭
Thank you for turning my weekend project into something much bigger! 🙏
What have you built with Formisch so far? What framework are you using? 👀
Thank you for turning my weekend project into something much bigger! 🙏
What have you built with Formisch so far? What framework are you using? 👀
December 6, 2025 at 1:04 AM
@formisch.dev hit 6,000 docs views in 30 days 😭
Thank you for turning my weekend project into something much bigger! 🙏
What have you built with Formisch so far? What framework are you using? 👀
Thank you for turning my weekend project into something much bigger! 🙏
What have you built with Formisch so far? What framework are you using? 👀
This is the entire login form. Seriously.
✅ Just give us your schema
✅ No custom type definitions are needed
✅ No generics → types are inferred
That’s it. Clean, tiny, stupidly type-safe.
✅ Just give us your schema
✅ No custom type definitions are needed
✅ No generics → types are inferred
That’s it. Clean, tiny, stupidly type-safe.
December 5, 2025 at 3:27 PM
This is the entire login form. Seriously.
✅ Just give us your schema
✅ No custom type definitions are needed
✅ No generics → types are inferred
That’s it. Clean, tiny, stupidly type-safe.
✅ Just give us your schema
✅ No custom type definitions are needed
✅ No generics → types are inferred
That’s it. Clean, tiny, stupidly type-safe.
React folks, quiet launch alert 🚀
I just shipped Formisch for React — the form library I originally built for @solidjs.com that people kept begging me to port.
I just shipped Formisch for React — the form library I originally built for @solidjs.com that people kept begging me to port.
December 4, 2025 at 4:57 PM
React folks, quiet launch alert 🚀
I just shipped Formisch for React — the form library I originally built for @solidjs.com that people kept begging me to port.
I just shipped Formisch for React — the form library I originally built for @solidjs.com that people kept begging me to port.
The first @formisch.dev for @react.dev tests were successful. A first version could be available by next week. 🧩
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
December 3, 2025 at 4:53 PM
The first @formisch.dev for @react.dev tests were successful. A first version could be available by next week. 🧩
The `toJsonSchema` function of Valibot was updated: github.com/open-circle/...
Release v1.4.0 (to-json-schema) · open-circle/valibot
Many thanks to @stefanprobst, @sruenwg and @cruzdanilo for contributing to this release.
Add support for examples action
Add support for integer when used with minValue and maxValue actions (pull ...
github.com
December 3, 2025 at 5:00 AM
The `toJsonSchema` function of Valibot was updated: github.com/open-circle/...
🚨 Security Alert: Valibot v1.2 is out! We've fixed a critical ReDoS vulnerability in the `emoji()` action's regex that could lead to excessive CPU usage on malicious inputs.
Huge thanks to Hiroya Fujinami for discovering and responsibly disclosing this—security heroes like you keep the web safer! 🙌
Huge thanks to Hiroya Fujinami for discovering and responsibly disclosing this—security heroes like you keep the web safer! 🙌
November 25, 2025 at 8:36 PM
🚨 Security Alert: Valibot v1.2 is out! We've fixed a critical ReDoS vulnerability in the `emoji()` action's regex that could lead to excessive CPU usage on malicious inputs.
Huge thanks to Hiroya Fujinami for discovering and responsibly disclosing this—security heroes like you keep the web safer! 🙌
Huge thanks to Hiroya Fujinami for discovering and responsibly disclosing this—security heroes like you keep the web safer! 🙌
@valibot.dev v1.2 adds a handy new feature: `examples([…])`
You can now attach sample values directly to your schemas and retrieve them later. 🪄
Useful for generating docs, form placeholders, or giving AI tools concrete examples from your actual schema.
You can now attach sample values directly to your schemas and retrieve them later. 🪄
Useful for generating docs, form placeholders, or giving AI tools concrete examples from your actual schema.
November 25, 2025 at 4:22 PM
@valibot.dev v1.2 adds a handy new feature: `examples([…])`
You can now attach sample values directly to your schemas and retrieve them later. 🪄
Useful for generating docs, form placeholders, or giving AI tools concrete examples from your actual schema.
You can now attach sample values directly to your schemas and retrieve them later. 🪄
Useful for generating docs, form placeholders, or giving AI tools concrete examples from your actual schema.