PyPI (Python Package Index)

Hosts: pypi.org · 16 facts

Error meanings

• ✅ verified:server:prod · not found · GET /pypi/{project}/json · env prod
• ✅ verified:server:prod · not found · GET /pypi/{project}/{version}/json · env prod
• ✅ verified:server:prod · ### not found · GET /simple/{project}/ · env prod

Rate limits

• 🔵 official · PyPI's JSON, RSS and Index APIs are not rate limited at the edge because of heavy CDN caching, but PyPI may prohibit a consumer for irresponsible activity. · GET /pypi/{project}/json · env prod

Breaking changes

• ✅ verified:server:prod · GET /pypi/{project}/{version}/json no longer has the releases key; the files of every release are only on /pypi/{project}/json and the Index API. · GET /pypi/{project}/{version}/json · env prod

Silent behavior

• ✅ verified:server:prod · GET /pypi/{project}/json with a non-normalized name such as Typing_Extensions returns HTTP 200 directly, without a redirect, and info.name is typing-extensions. · GET /pypi/{project}/json · env prod
• ✅ verified:server:prod · JSON API responses are CDN-cached with Cache-Control max-age=900 and carry ETag and X-PyPI-Last-Serial. · GET /pypi/{project}/json · env prod
• ✅ verified:server:prod · GET /pypi/{project}/json/ with a trailing slash returns HTTP 301 with a relative Location /pypi/{project}/json and an HTML body, not JSON. · GET /pypi/{project}/json/ · env prod
• 🔵 official · JSON API metadata comes from the values given at upload time, not from the files, and the first upload of a release is stored: later uploads to that release do not update it. · GET /pypi/{project}/{version}/json · env prod
• ✅ verified:server:prod · GET /simple/{project}/ returns HTML unless Accept asks for application/vnd.pypi.simple.v1+json; the JSON form has name, versions and meta._last-serial, and Vary lists Accept. · GET /simple/{project}/ · env prod
• ✅ verified:server:prod · GET /simple/{project}/ with a non-normalized name such as Typing_Extensions returns HTTP 301 to the PEP 503 normalized URL /simple/typing-extensions/. · GET /simple/{project}/ · env prod
• ✅ verified:server:prod · GET /simple/{project} without the trailing slash returns HTTP 301 to /simple/{project}/ instead of the project page. · GET /simple/{project} · env prod

Deprecations

• ✅ verified:server:prod · info.downloads in the JSON API is deprecated: last_day, last_week and last_month are always -1, and bugtrack_url is always null. · GET /pypi/{project}/json · env prod
• 🔵 official · The releases key of GET /pypi/{project}/json is deprecated and may be removed; projects should get release files from the Index API instead. · GET /pypi/{project}/json · env prod
• 🔵 official · The XML-RPC API is planned for deprecation and may be rate limited; no new integration should use it, and existing consumers should move to the JSON, RSS or Index APIs. · POST /pypi · env prod

Schema drift

• ✅ verified:server:prod · On 2026-10-20 /pypi/{project}/json had the top-level keys info, last_serial, ownership, releases, urls and vulnerabilities, schema fingerprint f2ea8b7e27a470cf. · GET /pypi/{project}/json · env prod

Data: CC BY 4.0 · apifacts registry · This page is generated; edit the YAML, not the page.