Geocoding · head-to-head
adresse.data.gouv.fr vs GeoJS
The Base Adresse Nationale's API Adresse geocodes and reverse-geocodes French addresses for free with no API key, backed by Etalab and IGN's data.geopf.fr infrastructure (the old api-adresse.data.gouv.fr host now 301-redirects there). Requests and responses use the GeoJSON FeatureCollection format, with each result scored for match confidence and enriched with INSEE city codes, postcodes, and population. A live Origin-header probe confirms open CORS (Access-Control-Allow-Origin: *), so it works directly from browser JavaScript with no proxy.
GeoJS is a free, no-signup IP geolocation lookup that returns country, city, ASN, and timezone data as JSON or JSONP over HTTPS with open CORS. It's built for simple client-side and ChatOps integrations rather than high-volume commercial traffic, and has no paid tier.
| adresse.data.gouv.fr | GeoJS | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | GeoJSON | JSON, JSONP |
| CORS | yes | yes |
| HTTPS | Yes | Yes |
GeoJS supports 2 response formats, while adresse.data.gouv.fr offers fewer — pick GeoJS for more integration flexibility.