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CDNJS vs Fake JSON API

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

APICDNJSNEW—Fake JSON APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree and open, no keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CDNJS vs Fake JSON API: common questions

Which is more reliable, CDNJS or Fake JSON API?

On our scheduled checks, Fake JSON API leads on measured uptime — CDNJS at —% versus Fake JSON API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do CDNJS and Fake JSON API need an API key?

Neither needs a paid key — CDNJS 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 CDNJS and Fake JSON API from the browser?

Yes — both CDNJS 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 CDNJS and Fake JSON API free for commercial use?

CDNJS 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.