connectrpc
Server and client runtime library for Connect RPC
Decision gist · record as of 2026-08-14
Yes, if you are building new RPC APIs and want to avoid writing serialization and type definitions twice. The low install friction, active maintenance, permissive license, and support for current Python versions make it a solid choice. The Beta status means the API may evolve, so pin versions in production. Not necessary if you already have a working gRPC or REST setup and don't need the code-generation workflow.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later; code generation via buf and protoc plugins is a separate prerequisite step before runtime usage.
- Low friction: pure Python wheel with only two runtime dependencies (protobuf-py and pyqwest).
- Active maintenance with a release within the last month and recent commits; project is in Beta status and supports current Python versions (3.10–3.14).
License · maintenance · safety
Apache-2.0 (permissive) — Apache-2.0 permissive license allows use in commercial and open-source projects with minimal restrictions; attribution required but no copyleft obligations.
last release 2026-07-15 (30 days) · last repo commit 2026-08-12 · 142 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 606,081 downloads/mo, #5,793 on PyPI
Alternatives
Verify before relying
pip install connectrpc
from connectrpc.request import RequestContext
# Server: subclass generated service and serve with ASGI
# Client: instantiate generated client and call methods
# See docs for generated stub imports after running buf codegen- Performance characteristics compared to gRPC or other RPC frameworks under typical load.
- Production readiness: Beta status suggests API stability may still evolve.
- Ecosystem maturity: tooling and third-party middleware availability beyond what's documented.
- Specific compression algorithm performance (gzip, brotli, zstd) in real-world scenarios.
What it is and what it does
Connect is a runtime library that lets you build RPC APIs by defining your schema once in Protocol Buffers and generating type-safe server and client code automatically. It runs on standard Python web frameworks (WSGI/ASGI) and works with curl and HTTP clients out of the box, while also speaking gRPC and gRPC-Web protocols. The library handles the transport and serialization; you write only your business logic.
It provides both synchronous and asynchronous client libraries, full streaming support (server, client, and bidirectional), built-in compression, and middleware hooks for logging and observability. The package depends on protobuf-py for message serialization and pyqwest for HTTP transport, and is actively maintained with support for modern Python versions.
Use it for
- Build a type-safe microservice that speaks both HTTP/JSON and gRPC without writing serialization code.
- Generate matching client libraries for multiple languages from a single Protobuf schema.
- Add streaming RPC endpoints to an existing ASGI or WSGI application alongside other routes.
- Implement server and client interceptors for distributed tracing, authentication, or request logging.
- Migrate from gRPC while maintaining protocol compatibility and reusing existing Protobuf definitions.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building new RPC APIs and want to avoid writing serialization and type definitions twice.
The low install friction, active maintenance, permissive license, and support for current Python versions make it a solid choice. The Beta status means the API may evolve, so pin versions in production. Not necessary if you already have a working gRPC or REST setup and don't need the code-generation workflow.
Install
connectrpc on PyPI
Before you install
Low friction: pure Python wheel with only two runtime dependencies (protobuf-py and pyqwest). Active maintenance with a release within the last month and recent commits; project is in Beta status and supports current Python versions (3.10–3.14).
Requires Python 3.10 or later; code generation via buf and protoc plugins is a separate prerequisite step before runtime usage.
License in practice
Apache-2.0 permissive license allows use in commercial and open-source projects with minimal restrictions; attribution required but no copyleft obligations.
Quickstart
pip install connectrpc
from connectrpc.request import RequestContext
# Server: subclass generated service and serve with ASGI
# Client: instantiate generated client and call methods
# See docs for generated stub imports after running buf codegenVerify before relying
- Performance characteristics compared to gRPC or other RPC frameworks under typical load.
- Production readiness: Beta status suggests API stability may still evolve.
- Ecosystem maturity: tooling and third-party middleware availability beyond what's documented.
- Specific compression algorithm performance (gzip, brotli, zstd) in real-world scenarios.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagesprotobuf-pypyqwest |
| Maintenance | Actively maintained 30 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 606,081 / month, #5,793 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: Internet :: WWW/HTTPTopic :: Software Development :: Libraries :: Python ModulesTyping :: Typed |
Evidence: connectrpc-0.11.1-py3-none-any.whl
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See also connect-python · grpclib · protoc-gen-connect-python · twentyc.rpc · grpc-interceptor · authzed · grpc-requests · grpcio · conjure-python-client · pyqwest