Overview

TurboStarter is designed to be a scalable and production-ready fullstack starter kit. One of the core features is a dedicated and extendable API layer. To enable this in a type-safe manner, we chose tRPC as the API server and client library.

All API endpoints and their resolvers are defined in the packages/api/ library. Here you will find a modules folder which contains the different feature modules of the API. Each module has its own folder and is exporting all the different resolvers in an index.ts file.

For each module we then create a separate tRPC router in the packages/api/router.ts file and aggregate all sub-routers into one main router.

The API is then exposed as a route handler that will be provided in a Next.js API route:

const handler = async (req: NextRequest) => {
  const response = await fetchRequestHandler({
    endpoint: "/api/trpc",
    req,
    router: appRouter,
    createContext: () =>
      createTRPCContext({
        headers: req.headers,
        auth: auth(),
      }),
    onError:
      env.NODE_ENV === NODE_ENV.DEVELOPMENT
        ? ({ path, error }) => {
            console.error(
              `❌ tRPC failed on ${path ?? "<no-path>"}: ${error.message}`,
            );
          }
        : ({ error }) => console.error(error),
  });
 
  setCorsHeaders(response);
  return response;
};
 
export { handler as GET, handler as POST };

Learn more about how to use the API in your mobile app in the following sections: