yarl
Yet another URL library
Decision gist · record as of 2026-08-14
Yes. yarl is a mature, actively maintained library in the top 100 PyPI packages with no known vulnerabilities. Its immutable design, automatic encoding/decoding, and low install friction make it the right choice for any Python project that needs robust URL handling. Use it unless you have a specific reason to prefer a different URL library.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- On systems without pre-built wheels, a C compiler and Python headers are needed to build from source, unless YARL_NO_EXTENSIONS environment variable is set (though pure-Python mode is slower).
- Low friction installation with pre-built wheels for Linux, Windows, and macOS.
License · maintenance · safety
Apache-2.0 (permissive) — Licensed under Apache 2.0 (permissive), allowing free use in commercial and private projects with minimal restrictions.
last release 2026-07-20 (25 days) · last repo commit 2026-08-10 · 1,490 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 621,403,276 downloads/mo, #50 on PyPI
Alternatives
Verify before relying
pip install yarl
from yarl import URL
url = URL('https://www.python.org/~guido?arg=1#frag')
print(url.host) # 'www.python.org'
print(url.path) # '/~guido'
print(url.query) # MultiDictProxy with query parameters- Performance characteristics of the pure-Python fallback compared to the compiled extension.
- Whether the immutable design and operator overloading (/, %) are well-suited to your URL manipulation patterns.
What it is and what it does
yarl is a URL parsing and manipulation library that represents URLs as immutable objects. It provides property-based access to all URL components—scheme, host, port, path, query, fragment—and automatically handles percent-encoding and decoding of non-ASCII characters. The library depends on multidict (for query parameter access), propcache (for caching), and idna (for internationalized domain names).
Instead of mutating URL objects, yarl creates new ones through operator overloading: the `/` operator appends path segments, and the `%` operator adds query parameters. This immutability makes URLs safe to pass between functions without risk of unintended modification. The library includes both decoded properties (e.g., `url.path`) and raw encoded versions (e.g., `url.raw_path`), plus a human-readable representation via `.human_repr()` for display purposes.
Use it for
- Parse and extract components from URLs in web scrapers or HTTP clients without manual string splitting.
- Build URLs programmatically for API requests, ensuring proper encoding of special characters and query parameters.
- Validate and normalize URLs in web applications, leveraging RFC-compliant host validation and zone ID handling.
- Manipulate URL paths and queries immutably in request routing or URL rewriting middleware.
- Handle internationalized domain names (IDN) and IPv6 addresses with zone IDs correctly.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
yarl is a mature, actively maintained library in the top 100 PyPI packages with no known vulnerabilities. Its immutable design, automatic encoding/decoding, and low install friction make it the right choice for any Python project that needs robust URL handling. Use it unless you have a specific reason to prefer a different URL library.
Install
yarl on PyPI
Before you install
Low friction installation with pre-built wheels for Linux, Windows, and macOS. Active maintenance with a release 25 days ago; the project is actively developed with recent bug fixes.
Requires Python 3.10 or later. On systems without pre-built wheels, a C compiler and Python headers are needed to build from source, unless YARL_NO_EXTENSIONS environment variable is set (though pure-Python mode is slower).
License in practice
Licensed under Apache 2.0 (permissive), allowing free use in commercial and private projects with minimal restrictions.
Quickstart
pip install yarl
from yarl import URL
url = URL('https://www.python.org/~guido?arg=1#frag')
print(url.host) # 'www.python.org'
print(url.path) # '/~guido'
print(url.query) # MultiDictProxy with query parametersVerify before relying
- Performance characteristics of the pure-Python fallback compared to the compiled extension.
- Whether the immutable design and operator overloading (/, %) are well-suited to your URL manipulation patterns.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packagesidnamultidictpropcache |
| Maintenance | Actively maintained 25 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 621,403,276 / month, #50 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersProgramming Language :: CythonProgramming Language :: PythonProgramming Language :: Python :: 3Programming 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 Modules |
Evidence: yarl-1.24.5-py3-none-any.whl
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See also furl · URLObject · url-normalize · prison · rison · hyperlink · urlcanon · repath · urlpy · purl