npm Registry vs PyPI
Same instrument, two spec sheets — measured, not claimed.
npm Registry vs PyPI: common questions
Which is more reliable, npm Registry or PyPI?
Both are neck-and-neck — npm Registry and PyPI each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, npm Registry or PyPI?
PyPI has the lower median latency in our checks — npm Registry responds in 243 ms versus PyPI at 46 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do npm Registry and PyPI need an API key?
Neither needs a paid key — npm Registry is callable with no signup, and PyPI is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call npm Registry and PyPI from the browser?
Yes — both npm Registry and PyPI send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are npm Registry and PyPI free for commercial use?
npm Registry has unclear commercial terms, and PyPI has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.