Query coordinate reference system (CRS) definitions programmatically via the EPSG Registry API
domain: epsg.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Review the EPSG Registry API user guide to understand endpoint structure and dataset versioning
Query by EPSG code (e.g., filter [code]=xxxx) or by name/wildcard text search across Name, Alias, and Extent Description fields
Use filter syntax for wildcards (%, *, ?, _, ranges like [a-c], or-conditions with |) to narrow results
Resolve dependencies for returned objects (e.g., a Projected CRS references a Datum and a Coordinate System) by following the linked resource endpoints
Export results in GML or WKT format for downstream GIS/CAD tooling
Known gotchas
The public API doesn't require a token for basic dataset queries, but logging in is needed to include deprecated/invalid items or search the Remarks field
The EPSG Dataset updates only a few times a year — cache aggressively rather than re-querying on every request
epsg.io is a separate, community-run mirror that is migrating its own search/transform endpoints to the MapTiler Coordinates API — don't confuse it with the official epsg.org Registry API
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