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GeoJS vs PostcodeData.nl

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

APIGeoJSHEALTHY99PostcodeData.nlHEALTHY94
Uptime · 30d
Uptime · 90d98.9%100%
Uptime · 30d96.6%100%
P50 · ms62372
P95 · ms11372169
Authnonenone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree, no API key requiredFree — limits not published
Rate limitUnpublished (no enforced limit stated)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GeoJS vs PostcodeData.nl: common questions

Which is more reliable, GeoJS or PostcodeData.nl?

On our scheduled checks, PostcodeData.nl leads on measured uptime — GeoJS at 98.9% versus PostcodeData.nl at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, GeoJS or PostcodeData.nl?

GeoJS has the lower median latency in our checks — GeoJS responds in 62 ms versus PostcodeData.nl at 372 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 GeoJS and PostcodeData.nl need an API key?

Neither needs a paid key — GeoJS is callable with no signup, and PostcodeData.nl is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call GeoJS and PostcodeData.nl from the browser?

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

Are GeoJS and PostcodeData.nl free for commercial use?

GeoJS has unclear commercial terms, and PostcodeData.nl 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.