A JSON Schema Type Builder for TypeScript that creates runtime schemas with static type inference.
TypeBox is a JSON Schema Type Builder for TypeScript that creates runtime JSON Schema objects which infer as static TypeScript types. It solves the problem of maintaining consistency between static type definitions and runtime validation by providing a unified type system that works with both TypeScript's compiler and standard JSON Schema validators.
TypeScript developers building applications that require runtime data validation, such as REST/RPC services, configuration schemas, or any system where data integrity between static types and runtime values is critical.
Developers choose TypeBox for its seamless integration of JSON Schema composition with TypeScript's type system, offering static type inference from runtime schemas, high-performance validation, and the ability to handle complex type transformations programmatically.
JSON Schema Type Builder with Static Type Resolution for TypeScript
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TypeBox's `Type.Static<typeof T>` infers precise TypeScript types directly from runtime schema objects, ensuring static and dynamic type consistency, as shown in the usage examples.
The built-in Schema compiler provides JIT JSON Schema validation optimized for throughput, with automatic fallback for restrictive environments like Cloudflare Workers.
The Script function transforms TypeScript definition strings into JSON Schema programmatically, handling complex type-level expressions like generics and conditional types.
Produces standard JSON Schema 2020-12 objects that interoperate with any compliant validator, avoiding vendor lock-in.
Maintains two distinct major versions (1.x ESM-only, 0.x CJS/ESM) with different TypeScript support, creating confusion and migration overhead for teams.
Requires explicit programmatic schema building for even simple types, which can be verbose compared to libraries with more concise APIs like Zod.
Lacks out-of-the-box integrations for common frameworks (e.g., Express middleware, OpenAPI generation), requiring additional custom code or third-party tools.