# ada-url/ada

WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.

Repository: https://github.com/ada-url/ada
Canonical: https://ross.abutalabs.com/products/ada
Homepage: https://ada-url.com
Language: C++
License: Apache-2.0
License Family: permissive
Topics: cpp, parser, url, performance, whatwg-url, neon, sse2, simd
Last push: 2026-08-25T02:34:04+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 95, longevity 96
- inputs: {"age_days": 1355, "days_push": 9, "days_rel": 37, "gap_med": 11.5, "n_releases_24m": 23}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1829, forks 136 (observed 2026-08-28T04:05:41.716030+00:00)

## What it is
Ada is a fast, WHATWG-compliant URL parser written in modern C++, including a full URLPattern implementation. It is the default URL parser in Node.js and is used by Cloudflare Workers, Redpanda, Kong, Telegram, and Datadog.

## Use cases
- parse and normalize URLs in a C++ application
- validate URLs against the WHATWG URL standard
- match URLs against patterns with URLPattern
- speed up URL parsing in a high-throughput server
- handle internationalized domain names and Unicode URLs

## When to choose
- you need spec-compliant WHATWG URL parsing in C++
- performance matters and you parse many URLs
- you want a battle-tested parser used by Node.js and Cloudflare

## When to avoid
- you need RFC 3986 behavior rather than WHATWG normalization
- your project is not in C++ or lacks C++ integration

## Facets
- artifact type: library
- maturity: stable
- function: parser, http-client, developer-tools
- domain: web-development, parsers, developer-tools, apis
- platform: cpp, windows, cross-platform
- tags: url-parsing, whatwg-url, urlpattern, simd, performance, unicode, idn, linux, macos

## Member repositories
- ada-url/ada (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:41.716030+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 2026-08-30T03:19:21.543236+00:00, confidence not recorded.
  - readme: https://github.com/ada-url/ada (fetched 2026-08-28T04:05:41.716030+00:00, sha 80e0b48fdde7)
  - homepage: https://ada-url.com (fetched 2026-08-29T10:58:09.297247+00:00, sha 9c2c364a19d3)
  - site_page: https://ada-url.com/introduction (fetched 2026-08-29T10:58:09.299760+00:00, sha 6e03c6e46e47)
- Data as of 2026-08-30T08:39:29.467469+00:00.