tRPC vs oRPC - API Layer Comparison

tRPC vs oRPC is a comparison that matters once you have decided you want end-to-end type safety between your TypeScript client and server — and you are weighing which typed RPC approach fits your project. Both eliminate the pain of hand-writing REST clients. Where they differ is maturity, monorepo ergonomics, and how friendly they are to OpenAPI and external consumers. Here's the 2026 breakdown.

Quick Answer

Choose tRPC if you want mature, end-to-end type-safe RPC inside a TypeScript monorepo where client and server share types directly. Choose oRPC if you want a newer type-safe RPC approach that is friendlier to OpenAPI and standard HTTP contracts. Both give you typed calls without hand-writing a REST client; the difference is tRPC's maturity and monorepo ergonomics versus oRPC's OpenAPI-friendly, contract-first leaning. Verify current details on each project's site.

At a glance

(Both projects evolve — confirm current capabilities on their sites.)

tRPC

tRPC lets a TypeScript client call server procedures with full type inference and no schema duplication, which is ideal in a monorepo where both sides share types. The tradeoff is that it is RPC-shaped rather than a standard REST/OpenAPI surface.

oRPC

oRPC is a newer type-safe RPC library that leans toward OpenAPI-friendly, standard-HTTP contracts while keeping inferred types. It appeals to teams that want typed calls plus an OpenAPI-style contract for external consumers. Verify its current feature set on its site.

// untested-here - illustrative only
// tRPC-style procedure call (types inferred end-to-end)
const user = await trpc.user.byId.query({ id });

Type-safety and OpenAPI

Both deliver strong type-safety. The practical split is contract surface: tRPC optimizes for TS-to-TS RPC inside one codebase; oRPC aims to play nicely with OpenAPI/HTTP so non-TS or external clients integrate more naturally.

Which to choose?

• Pick tRPC for a TS monorepo where you control both ends and want maximum DX.

• Pick oRPC when you want typed RPC plus an OpenAPI-friendly contract for broader consumers.

How this maps to FastStaq

FastStaq does not use tRPC or oRPC. It ships a dedicated Express/TypeScript REST API (server/src) consumed by the Next.js client over HTTP — a deliberate choice for a clear client/server split and a conventional REST surface. If you prefer typed RPC, tRPC/oRPC are layers you would adopt in your own app; the architectural lesson here applies regardless of FastStaq. See building API routes in Next.js and Next.js Server Actions.

Frequently asked questions

Does FastStaq use tRPC or oRPC? No — it uses a typed REST API on Express. tRPC/oRPC are alternatives you could adopt in your own code.

Is oRPC a drop-in tRPC replacement? They overlap but differ on OpenAPI/contract orientation — evaluate against your client mix and verify current features.

Do I need RPC at all? No — a well-typed REST API (FastStaq's approach) works well for many SaaS apps; RPC mainly helps tight TS monorepos.

Next steps

• Read building API routes in Next.js

• See Next.js Server Actions

• Back to the Next.js authentication guide