Valibot's <1kb core slashes technical debt and boosts perf 📈 See the benchmarks: schemabenchmarks.dev/download

Valibot's modularity lets you build schemas like Lego 🧩

Valibot shines in invalid data parsing! ⏱️ At 29 μs, it's over 3x faster than Zod (93 μs) and ArkType (97 μs) in our benchmarks. 😎

🚨 Missed our big announcement yesterday? We launched schemabenchmarks.dev! 🎉 An open-source project comparing top JS schema libraries like @zod.dev, @valibot.dev, @arktype.io, Typia, TypeBox, Effect and more. 🧩

Welcome Schema Benchmarks 😎 bsky.app/profile/fabi...

Proud to have teamed up with @eskimojo.bsky.social on Schema Benchmarks! 🙌 Valibot and Typia neck-and-neck on bundle size (~1.9KB gzipped)—the fight for the smallest bundles is heating up! 🔥 Transparent metrics like these help us all improve—dive in and let us know what you think!

Tired of forms that re-render the entire UI on every keystroke? 😭 @formisch.dev's signal-based updates are fine-grained—only changed fields refresh. ⚡️ Zero boilerplate, max perf. Works across React, Solid, Vue, Svelte...

Ever chained validations and transforms without type headaches? @valibot.dev's pipe() does it all in one flow – modular, tree-shakable, and blazing fast. ⚡️

Tired of libraries that bloat your bundle? @valibot.dev and @formisch.dev are both modular and tree shakeable ⚡️ 100% test coverage, fully type-safe and zero bundle overhead 🧩

Humbled to share: @formisch.dev just crossed 600 GitHub stars 🙌 The rewrite (from Modular Forms) was a lot of late nights, but seeing teams adopt the modular approach makes it all worth it. 🙏

TypeScript is the baseline in 2026. But most forms still fight type drift between API, schema & UI. @formisch.dev + @valibot.dev = one source of truth, zero boilerplate ⚡️ const form = useForm({ schema: YourSchema });

Ever imported a full schema lib just for email checks? 😅 Valibot's modularity fixes that. Only <1kb gzipped. Type-safe. Tree-shakable. 🪄 What’s the smallest schema you’ve ever shipped?

Quick community poll 👇 Which framework are you mainly building forms with right now? What causes you the most trouble? We read the replies and use it to make @formisch.dev even better 🙌

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AI coding agents + agent skills are blowing up right now 🔥 That’s why we shipped official Valibot & Formisch agent skills. They teach agents to output cleaner schemas, proper types, and modular forms — dramatically better code quality. No more fighting bad validation or bloated forms.

Quick @valibot.dev refresh: branded types are an underrated gem for catching stringly-typed bugs early 🪄 Gives you nominal typing with zero runtime cost. Super useful in large codebases. 🧩 What’s your favorite lesser-known Valibot trick? 🙏

We've released official agent skills for @valibot.dev and @formisch.dev! They dramatically improve code quality from coding agents. Check them out and add to your repo: github.com/open-circle/...

Curious how @formisch.dev supports React, Solid, Vue, Svelte, Qwik & more — with zero bundle bloat and truly native performance? ⚡️ No runtime abstraction magic. Just smart build-time reactivity injection. 🪄 Check out the framework-agnostic architecture: deepwiki.com/open-circle/...

What's @fabianhiller.com's latest project? Formish, framework agnostic forms. www.youtube.com/watch?v=WpHI... open.spotify.com/episode/3M78...

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...

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. 🔧

npmx.dev looks amazing! Great job!

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...

Check it out! 👀

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. 🪄

I build something with @convex.dev, @tanstack.com start, @shadcn.com, @valibot.dev and @formisch.dev this weekend. It was fun!

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. ⚡️

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:

@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

🤏 soooo close to 1M npm downloads on a single day!

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...

🛠️ 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/...

If you missed it... Formisch is also available for @react.dev! 🔥 Try it out right now with Next.js, TanStack Start or a raw Vite-based setup 🤓 Schema-based magic, full type inference from Valibot, tiny bundle (<3kB), headless & stupidly type-safe 🚀 Docs + playground: formisch.dev/react/guides...

🚀 From my 2023 bachelor's thesis on modular TS schema libraries to Valibot v1.2 in 2026: 8.4k GitHub stars, 5M+ weekly npm downloads, and features like AI metadata! Curious about the origins? Read the thesis that started it all: valibot.dev/thesis.pdf #TypeScript #Valibot #WebDev

Formisch core = **100% test coverage** achieved! 🛡️ The Vite of forms just got bulletproof 🔥 Adapters (React, Solid, Vue, Svelte, Qwik…) next → then AI agents can safely hack on the lib codebase 😈 Schema-based, headless, <3kB magic for any JS framework 🧩 formisch.dev

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.

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.

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...

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

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!

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

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/**/*

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

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 🚀📊

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

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.

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.