TypeScript Middleware

Type-safe request interceptors that enforce data contracts and propagate context across the server stack.

TypeScript middleware converts standard request pipelines into type-safe execution chains by leveraging Zod schemas and generic inference. In frameworks like tRPC or Hono, these layers validate inputs and inject context (such as database sessions or user metadata) directly into downstream handlers. By catching schema mismatches at compile time, developers eliminate the "any" type risks prevalent in legacy Express architectures. This pattern ensures that every piece of data reaching your business logic is verified and correctly typed: reducing runtime errors and accelerating development velocity.

https://trpc.io/docs/server/middlewares