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Crates.io vs Fake JSON API

Same instrument, two spec sheets — measured, not claimed.

APICrates.ioHEALTHY90Fake JSON APIHEALTHY88
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d100%98.3%
P50 · ms458865
P95 · ms13172006
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crates.io vs Fake JSON API: common questions

Which is more reliable, Crates.io or Fake JSON API?

Both are neck-and-neck — Crates.io and Fake JSON API each measure 99.02% 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, Crates.io or Fake JSON API?

Crates.io has the lower median latency in our checks — Crates.io responds in 458 ms versus Fake JSON API at 865 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 Crates.io and Fake JSON API need an API key?

Neither needs a paid key — Crates.io is callable with no signup, and Fake JSON API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Crates.io and Fake JSON API from the browser?

Yes — both Crates.io and Fake JSON API 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 Crates.io and Fake JSON API free for commercial use?

Crates.io has unclear commercial terms, and Fake JSON API 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.