Fastify

tRPC is a TypeScript-first RPC framework that enables end-to-end type-safe API communication between client and server without code generation or schemas. This monorepo contains the core server and client libraries, framework integrations (React Query, Next.js, Express, Fastify, Lambda, etc.), transport layers (HTTP, WebSocket, SSE streaming), a documentation website built with Docusaurus, example applications, and a codemod-based upgrade tool for version migrations.

Tech Stack

FastifyReactGraphQLPrismatRPCNext.jsDrizzle ORMExpress.jsZodTailwind CSS

Key Features

Type-safe procedure builder
Transport links system
HTTP batch streaming
WebSocket subscriptions
Platform adapters
React Query integration
Next.js integration
Observable-based subscriptions
Version upgrade codemods
Error handling and formatting
Documentation website

Coding Conventions

Standards and patterns used in this codebase

file-organization

Monorepo structure: apps/ contains deployable applications, packages/ contains shared libraries

Packages: packages/client, packages/next, packages/react-query

packages/clientpackages/next

code-style

TypeScript is the primary language

All new files should be .ts or .tsx

vitest.config.tsscripts/entrypoints.tswww/docusaurus.config.ts

configuration

Configuration is centralized in config files

Config files: eslint.config.js, prettier.config.js

eslint.config.jsprettier.config.jsvitest.config.ts

data-layer

Database operations are in data layer

Data files: examples/next-prisma-starter/eslint.config.mjs, examples/next-prisma-starter/next.config.ts

examples/next-prisma-starter/eslint.config.mjsexamples/next-prisma-starter/next.config.tsexamples/next-prisma-starter/tailwind.config.ts