# mozilla/neqo

Neqo, the Mozilla Firefox implementation of QUIC in Rust

Repository: https://github.com/mozilla/neqo
Canonical: https://ross.abutalabs.com/products/neqo
Homepage: https://firefox-source-docs.mozilla.org/networking/http/http3.html
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: firefox, ietf, mozilla, quic, rust, http3
Last push: 2026-08-25T12:33:08+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 99, longevity 100
- inputs: {"age_days": 2753, "days_push": 8, "days_rel": 8, "gap_med": 13.5, "n_releases_24m": 41}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2220, forks 166 (observed 2026-08-28T04:06:27.540868+00:00)

## What it is
Neqo is Mozilla's Rust implementation of the QUIC transport protocol, HTTP/3, and QPACK, used in production by Firefox and usable standalone as a library. It also ships command-line tools (neqo-client, neqo-server) for testing and debugging HTTP/3 endpoints, though the server side is explicitly experimental.

## Use cases
- implement QUIC transport in a Rust application
- test an HTTP/3 server with a command-line client
- add HTTP/3 support to a browser or network client
- debug QUIC connections with QLOG logs
- experiment with IETF QUIC and HTTP/3 protocol compliance
- build a standalone HTTP/3 client using NSS for TLS

## When to choose
- you need a standards-compliant QUIC/HTTP/3 client library in Rust with a proven production track record in Firefox
- you want interoperability testing tools for HTTP/3 servers and clients
- you prefer TLS backed by Mozilla NSS

## When to avoid
- you need a production-ready HTTP/3 server - the neqo server is experimental and not recommended for production
- you want a TLS backend other than NSS
- you need a fully-featured, configurable server for live deployments

## Facets
- artifact type: library
- maturity: active
- function: http-client, http-server, networking, security, cli
- domain: networking, web-development, developer-tools, apis
- platform: rust, windows, cross-platform, cli
- tags: quic, http3, qpack, tls, nss, firefox, ietf-standards, qlog, udp-transport, linux, macos

## Member repositories
- mozilla/neqo (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:27.540868+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:45:50.621453+00:00, confidence not recorded.
  - readme: https://github.com/mozilla/neqo (fetched 2026-08-28T04:06:27.540868+00:00, sha 157be3233ed3)
  - homepage: https://firefox-source-docs.mozilla.org/networking/http/http3.html (fetched 2026-08-29T10:26:03.665578+00:00, sha 11b3a7c980e1)
  - site_page: https://firefox-source-docs.mozilla.org/devtools-user/index.html (fetched 2026-08-29T10:26:03.677779+00:00, sha bb0398eb9a93)
  - site_page: https://firefox-source-docs.mozilla.org/index.html (fetched 2026-08-29T10:26:03.672406+00:00, sha 23d5dbede3b0)
  - site_page: https://firefox-source-docs.mozilla.org/devtools-user/about_colon_debugging/index.html (fetched 2026-08-29T10:26:03.675444+00:00, sha ff333d907452)
  - site_page: https://firefox-source-docs.mozilla.org/devtools/index.html (fetched 2026-08-29T10:26:03.680090+00:00, sha 1e26958c1196)
  - site_page: https://firefox-source-docs.mozilla.org/networking/http/resource_tailing.html (fetched 2026-08-29T10:26:03.681949+00:00, sha 2f45e6d3ae23)
  - site_page: https://firefox-source-docs.mozilla.org/networking/index.html (fetched 2026-08-29T10:26:03.683961+00:00, sha edf64505925b)
  - site_page: https://firefox-source-docs.mozilla.org/tools/moztreedocs/index.html (fetched 2026-08-29T10:26:03.685652+00:00, sha dcbba387028c)
  - site_page: https://firefox-source-docs.mozilla.org/testing/perfdocs/index.html (fetched 2026-08-29T10:26:03.687310+00:00, sha bf18ab538a80)
- Data as of 2026-08-30T08:39:29.467469+00:00.