oRPC

oRPC (OpenAPI Remote Procedure Call) provides end-to-end typesafe APIs in TypeScript while fully adhering to the OpenAPI specification. It can automatically generate a complete OpenAPI spec, simplifying integration and documentation. We’ve found oRPC particularly strong for integrations. While alternatives such as tRPC and ElysiaJS often require adopting a new framework to gain type safety, oRPC integrates seamlessly with existing Node.js frameworks, including Express, Fastify, Hono and Next.js. This flexibility makes it an excellent choice for teams looking to adopt end-to-end type safety to existing APIs without a disruptive refactor.