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TypeScript Academy · Lesson

Type-Safe tRPC Client Overview

See how tRPC achieves end-to-end type safety.

Type-Safe tRPC Client Overview is a free TypeScript Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the TypeScript Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Welcome

tRPC enables end-to-end TypeScript type safety between server and client without code generation.

What Is tRPC

tRPC lets you call server functions from the client with full type safety. No OpenAPI spec, no codegen — just TypeScript.

Server Router Definition

Define typed procedures on the server using tRPC routers.
import { initTRPC } from '@trpc/server';
const t = initTRPC.create();
const appRouter = t.router({
  getUser: t.procedure.input(z.number()).query(({ input }) => db.getUser(input)),
});

Type Inference

Export the router type for use on the client.
export type AppRouter = typeof appRouter;

Client Setup

Create a typed tRPC client using the server router type.
import { createTRPCProxyClient, httpBatchLink } from '@trpc/client';
const trpc = createTRPCProxyClient<AppRouter>({
  links: [httpBatchLink({ url: '/api/trpc' })],
});

Typed Client Calls

Call server procedures from the client with full autocomplete.
const user = await trpc.getUser.query(1);
// user is typed as the return type of getUser

Input Validation with Zod

Use Zod schemas as tRPC input validators.
t.procedure.input(z.object({ name: z.string(), email: z.string().email() })).mutation(...)

Mutations

Define mutations for data-modifying operations.
const router = t.router({
  createUser: t.procedure.input(CreateUserSchema).mutation(({ input }) => db.create(input)),
});

React Query Integration

tRPC integrates with React Query for data fetching with full type inference.
const { data: user } = trpc.getUser.useQuery(1);
// data is typed automatically

Error Handling in tRPC

tRPC provides typed errors with TRPCError.
import { TRPCError } from '@trpc/server';
if (!user) throw new TRPCError({ code: 'NOT_FOUND', message: 'User not found' });

tRPC vs REST vs GraphQL

tRPC is ideal for full-stack TypeScript projects. REST and GraphQL are better for public or cross-language APIs.

Quick Check

How does tRPC achieve type safety between server and client?

Recap

Type-Safe tRPC Client Overview: mastered the key concepts and patterns.

Frequently asked questions

Is the “Type-Safe tRPC Client Overview” lesson free?

Yes — the full text of “Type-Safe tRPC Client Overview” is free to read here on the web, and the TypeScript Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the TypeScript Academy course, upgrade to CoddyKit PRO.

What will I learn in “Type-Safe tRPC Client Overview”?

See how tRPC achieves end-to-end type safety. You practise TypeScript Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start TypeScript Academy?

No prior experience is required. TypeScript Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Type-Safe tRPC Client Overview” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this TypeScript Academy lesson?

Yes. Every TypeScript Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Typing Fetch Responses with Generic Wrappers
  2. Runtime Validation with Zod
  3. OpenAPI Codegen: Auto-Generated Types
  4. Type-Safe tRPC Client Overview
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