ArkType Has a Free API — TypeScript's Fastest Runtime Validator

ArkType is a runtime type validation library that uses TypeScript syntax directly. Write types once, validate at runtime — with the best error messages in the ecosystem. Why ArkType? Unlike Zod or Yup, ArkType lets you write validators using actual TypeScript-like syntax. No method chains, no special DSL — just types. Quick Start npm install arktype import { type } from ' arktype ' ; const user = type ({ name : ' string ' , email : ' string.email ' , age : ' number > 0 ' , }); // Validate data const result = user ({ name : ' Alice ' , email : ' alice@example.com ' , age : 30 }); if ( result instanceof type . errors ) { console . log ( result . summary ); } else { console . log ( result ); // typed as { name: string, email: string, age: number } } Advanced Types // Union types const status = type ( ' "active" | "inactive" | "pending" ' ); // Array types const tags = type ( ' string[] ' ); // Tuple types const point = type ([ ' number ' , ' number ' , ' number ' ]); // Optional propertie