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npm Registry vs serpstack

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

APInpm RegistryNEW—serpstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree (public registry)Free tier — key may be required
Rate limitUnpublished (bulk scraping discouraged)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

npm Registry vs serpstack: common questions

Which is more reliable, npm Registry or serpstack?

On our scheduled checks, serpstack leads on measured uptime — npm Registry at —% versus serpstack 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 npm Registry and serpstack need an API key?

npm Registry needs no key, while serpstack requires a free API key. If you want to start calling without signup, reach for npm Registry first.

Can I call npm Registry and serpstack from the browser?

Only npm Registry is browser-friendly — it returns CORS headers over HTTPS. serpstack needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are npm Registry and serpstack free for commercial use?

npm Registry has unclear commercial terms, and serpstack 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.