Connect RPC

lastmod 2026-01-07created 2026-01-072 edits

Simple, reliable, interoperable.

Protobuf RPC that works.

Connect is a family of libraries for building browser and gRPC-compatible APIs. If you're tired of hand-written boilerplate and turned off by massive frameworks, Connect is for you.

Connect-Web

• Github - connect-web
• Buf | Connect-Web: It's time for Protobuf and gRPC to be your first choice in the browser

Simple, reliable, interoperable. A better gRPC-Web.

A TypeScript library for making RPC calls from the browser

Features

• Google's grpc-web has weak TS support, no JSON or ECMAScript module support, and its generated code looks like 10-year-old Java
• Connect-web generates code that looks like a hand-written REST client
• Supports 2 RPC protocols: gRPC-Web and Connect's own protocol
• The Connect protocol is a simple POST-only protocol
  • Works over HTTP/1.1 or HTTP/2
  • Takes only the good parts of gRPC and gRPC-Web
• Supports both Promise- and Callback-based APIs
  • Integrates well with React, Angular, Svelte, etc.
• Switching the demo from grpc-web reduced the bundle size by 80%

See also

• RPC
• TypeScript
• buf
• gRPC
• grpc-web
• Protobuf

Favorite site

• Connect