What is tRPC?

tRPC is a TypeScript library that lets you build end-to-end type-safe APIs without schema files, code generation, or serialization layers. You define procedures (functions) on the backend, and the frontend calls them with full type inference — change a type on the server, and TypeScript immediately shows errors on the client.

Key Features

No Schema, No Codegen

Unlike GraphQL or OpenAPI, tRPC doesn’t need schema files or code generation. Your TypeScript functions ARE the API. Define a procedure on the server, call it from the client — types flow automatically.

Instant Feedback Loop

Change a return type on the backend, and your frontend immediately shows a TypeScript error. No waiting for API docs to update, no runtime surprises. This is what full-stack type safety feels like.

React Integration

tRPC’s React integration pairs with TanStack Query for caching, loading states, and optimistic updates. useQuery and useMutation hooks are fully typed — you get autocomplete for inputs and outputs.

Server-Side Calls

In Next.js, tRPC can call procedures directly without HTTP overhead. Server components and client components share the same type-safe API.

Pricing

tRPC is completely free and open-source (MIT license). No paid tiers.

Who Should Use tRPC?

• Full-stack TypeScript teams who want end-to-end type safety
• Next.js developers building monorepo applications
• Startups wanting to move fast without API contract overhead
• Teams tired of maintaining GraphQL schemas or OpenAPI specs

The Bottom Line

tRPC is the most productive way to build APIs in TypeScript. The type safety is magical — change something on the backend, and the frontend knows immediately. If your stack is all TypeScript, tRPC eliminates an entire category of bugs and boilerplate. It’s the future of full-stack TypeScript development.