openapi-typescript is a code generation tool that produces TypeScript types from OpenAPI 3 specifications.
The tool solves the problem of maintaining type safety when consuming APIs defined by OpenAPI schemas. Rather than manually writing TypeScript interfaces that mirror API contracts, openapi-typescript generates accurate types directly from static OpenAPI schemas, eliminating the friction between API documentation and client-side type definitions. The project provides two complementary packages: one for type generation from OpenAPI specs, and another called openapi-fetch that provides ultra-fast HTTP fetching with types automatically derived from your schema.
Teams building TypeScript applications that consume OpenAPI-documented APIs should consider this tool, particularly when type safety and reducing boilerplate are priorities. It works well for projects where the API contract is already defined in OpenAPI format and you want client types to stay synchronized with that contract. The tool supports OpenAPI 3.0 and 3.1 specifications.
The project maintains active engagement with its community through documented contribution guidelines for each of its packages and maintains a dedicated documentation site. Development is supported by multiple sponsors and backers, indicating sustained investment in the tool's direction and reliability.
