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MailboxValidator Free Email Checker vs npm Registry

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

APIMailboxValidator Free Email CheckerHEALTHY94npm RegistryHEALTHY98
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms527243
P95 · ms11381246
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree (public registry)
Rate limitUnpublishedUnpublished (bulk scraping discouraged)
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs npm Registry: common questions

Which is more reliable, MailboxValidator Free Email Checker or npm Registry?

Both are neck-and-neck — MailboxValidator Free Email Checker and npm Registry 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, MailboxValidator Free Email Checker or npm Registry?

npm Registry has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 527 ms versus npm Registry at 243 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 MailboxValidator Free Email Checker and npm Registry need an API key?

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

Can I call MailboxValidator Free Email Checker and npm Registry from the browser?

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

Are MailboxValidator Free Email Checker and npm Registry free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and npm Registry 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.