ArkType

📢ArkType 2.2 is here. This is a big one, and it's long overdue. Validated functions, type-safe regex, bidirectional JSON Schema, and universal schema interop. Here's what's new 🧵

@ark/json-schema — Bidirectional JSON Schema Parse JSON Schema into ArkType Types, and convert Types to JSON Schema. Huge thanks to @TizzySaurus for building this one. toJsonSchema() now supports configurable fallbacks, draft-07/2020-12 targets, and cyclic types.

📢ArkType 2.2 is here. This is a big one, and it's long overdue. Validated functions, type-safe regex, bidirectional JSON Schema, and universal schema interop. Here's what's new 🧵

Type-safe regex via arkregex Regex literals in your definitions now carry full type inference. x-prefix parses capture groups at runtime.

📢ArkType 2.2 is here. This is a big one, and it's long overdue. Validated functions, type-safe regex, bidirectional JSON Schema, and universal schema interop. Here's what's new 🧵

all you need to "learn" ArkType syntax: 1️⃣ start with a typescript keyword 2️⃣ .autocomplete to discover constraints 3️⃣ compose if needed with &, |, etc.

wish TS had rust-style pattern matching? (it already does)🪄

🚨Standard JSON Schema v1 just dropped🚨 🟢libraries can now accept ArkType wherever they need JSON Schema 🟢100% type-safe with inference built-in 🟢day one support from AI SDK 🟢TanStack AI and MCP SDK support imminent

"bUt StRiNgS aReN'T tYpE sAfE"

95% of ArkType syntax is just TypeScript. The other 5% are extensions like this that are... ✅composable ✅consistent across data types ✅100% safe with helpful type-level error messages

once you go type("string") you never go z.back()

Difficulty of Parsing Regex with TypeScript Types ------------------------------------------------------------ group associativity ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ everything else ▒▒

In the next version of ArkType, any Standard Schema is a valid definition. Zod migration is about to get a whole lot easier🚀

fastest, cleanest tuple validation around

friends don't let friends have unsafe regex

coming in ArkType 2.2... e(x)ec mode for regex literals🧑‍🍳

📈arkregex just hit 100k installs/week📈 if you're still using untyped RegExp() you may as well just write raw .js

string validation has never been this easy arktype🤝arkregex

problem: your RegExp is beyond human comprehension solution: pnpm i arkregex

I'll take "meticulously typed regex features you probably didn't know existed" for $500

in the latest version of arktype: regex properties and index signatures from arkregex🔒