What is the best way to synchronize API definitions between the server and client using TypeScript?

My setup involves a server (TypeScript, NestJS) and a client (TypeScript, Angular) that communicate with each other.

Right now, I have the API response DTO classes defined in both the server to output data and in the client to decode the responses into a class. This doesn't seem like an efficient solution.

Is there a better way to share the API response DTOs between these two projects? And if not, why is it not a good idea?

Ideally, I want to be able to easily modify the API response format on the server side without causing issues for the client. Since my project is still in its early beta stage and I handle deployment for both client and server, many of these changes can break things.

Currently, the DTOs are stored in separate git repositories, but I'm open to changing this if necessary.

Answer №1

If you're looking to streamline your project structure and share types/models between frontend and backend, there are a few approaches you can consider. Each option requires some planning and effort on your part.

Opting for a monorepo setup with tools like NX (check out this helpful guide) allows you to centralize your types/models for both ends of the project. Alternatively, you could explore other solutions like Turborepo.
Alternatively, creating a shared repository specifically for types and leveraging git submodules (learn more here) can also facilitate sharing between frontend and backend.

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