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TypeScript Academy · Lesson

The tRPC Architecture

How tRPC eliminates API schema duplication.

The End-to-End Problem

In a typical web app, the server defines an API and the client calls it. Keeping their types in sync is hard: change a field on the server and the client silently breaks at runtime. tRPC solves this by sharing types directly, with no code generation.

// Server: returns { id: number; name: string }
// Client: must know that shape exactly
// Without sync: runtime errors when they drift

What tRPC Is

tRPC is a library for building fully typed APIs in TypeScript. The server defines procedures; the client calls them as if they were local functions, with complete autocomplete and type checking inferred from the server code.

// Client call looks like a local function:
// const user = await client.user.byId.query(1);
// user is typed automatically from the server

All lessons in this course

  1. The tRPC Architecture
  2. Defining Routers and Procedures
  3. Client-Server Type Inference
  4. Middleware and Context
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