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Full stack typesafe API-first development for REST.

OpenAPI Stack is a collection of open source libraries and tools for full stack Typescript development inspired by modern alternatives like GraphQL and tRPC.


Build, Validate, Route, Authenticate, and Mock your backend using the openapi-backend library.


Easily consume your OpenAPI specification using the typesafe openapi-client-axios library.


Design, automate and test your API using the openapicmd command line tool.