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Fabian Hiller
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Fabian Hiller
@FabianHiller
TypeScript expert w/ 300M+ monthly npm downloads. Creator of @valibot & @formisch_dev, co-creator of standardschema.dev and prev engineer at @useMotion.
New York, USA
megalink.io/fabian
Joined December 2021
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3,193
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  • Pinned
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    Fabian Hiller
    @FabianHiller
    Jun 23
    Formisch v1 is finally in RC! 🎉 After a year of long nights, the form library I wish existed when I was building complex forms for my first startup is here. Schema-first. Fully type-safe. Tiny (starts at 2.5 kB). And not just React — it runs on 6 frameworks from one core.
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    Formisch v1 RC is now available
    From formisch.dev
    30K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Mar 19, 2025
    I am excited to announce the release of Valibot v1, a 1 kB alternative to Zod with a type-safe and easy-to-remember API. Check out the announcement post now:
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    Valibot v1 - The 1 kB schema library
    From valibot.dev
    63K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jul 25, 2023
    As part of my thesis, supervised by @mhevery and @RyanCarniato, I'm releasing a new open source project! Valibot is a schema library like @zodtypes, except that Valibot is modular and can be code split to a few hundred bytes. Read more in the announcement:
    Introducing Valibot, a < 1kb Zod Alternative
    Introducing Valibot, a < 1kb Zod Alternative
    From builder.io
    143K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Nov 18, 2024
    Hey 👋 I am Fabian, the creator of Valibot, a TypeScript library with almost 2M monthly downloads and more than 6K stars on GitHub. I am looking for a US-based tech job starting in January. Feel free to share this post with your network! 🧩
    71K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jul 26, 2023
    Valibot, a < 1kB Zod alternative, is at almost 1,000 stars on GitHub one day after the official announcement! Thanks to every single person who supported us yesterday on release day. Your support means a lot to us! 💙
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    38K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Oct 5, 2023
    With this post I publish my bachelor thesis. 🧑‍🎓 As part of the research I looked at @zodtypes, @arktypeio and Typia and investigated how the bundle size of JavaScript libraries can be reduced. Thank you @mhevery and @RyanCarniato for your support.
    This technique makes Valibot’s bundle size 10x smaller than Zod’s!
    This technique makes Valibot’s bundle size 10x smaller than Zod’s!
    From builder.io
    42K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jun 10, 2025
    Is your React app slow and the code error-prone? Are unnecessary re-renders, `useMemo`, `useContext` and `memo` slowing you down? 😭 At @useMotion, we're investigating an approach that lets you use SolidJS components inside a React app. You can even pass state via props between
    Stuck with a legacy React codebase? You can use SolidJS in React! StackBlitz demo in comments!
    25K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jan 13, 2024
    Great article by Matthew Kwong about the migration from @zodtypes to Valibot: mwskwong.com/blog/migrating…
    Cover image of the article: Migrating from Zod to Valibot
    33K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jun 6, 2024
    After 3 months of hard work I am happy to announce that @valibot v0.31.0 is finally available. This is not a regular release as we have rewritten the whole library from scratch. Read the full announcement post now:
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    Valibot v0.31.0 is finally available
    From valibot.dev
    24K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jul 22, 2025
    I think there is a misunderstanding. While Zod v4 Mini is much smaller than Zod v3, the bundle size is still ~80% bigger compared to @valibot. Example:
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    22K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jan 21, 2025
    We have reached another big milestone! Valibot passed 1 million weekly downloads yesterday! I am speechless... 🙏
    Valibot passed 1 million weekly downloads on npm
    8.5K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Jan 16, 2024
    If you have been planning to migrate from Zod to Valibot, now might be the time. Our official migration guide will guide you through all the differences. I also promise that most of our API reference will be ready by the end of the month.
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    Migrate from Zod
    From valibot.dev
    32K
  • user avatar
    Fabian Hiller
    @FabianHiller
    Feb 10, 2025
    Valibot v1 RC is out! 🧩 Many of you have been waiting for our first stable release, and with this blog post I am happy to announce that we are very very close.
    valibot.dev
    Valibot v1 RC is now available
    Many of you have been waiting for our first stable release, and with this blog post I am happy to announce that we are very very close.
    10K
  • user avatar
    Fabian Hiller
    @FabianHiller
    May 9, 2025
    Valibot v1.1 introduced a native way to parse and stringify JSON. These new transformation actions automatically catch errors and handle all edge cases, and you can combine them with other schemas and actions for 100% reliable results. 🧩
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    9.9K

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