http://nominatim.openstreetmap.org/reverse?lat=48.8570&lon=2.3620&format=json&zoom=18&addressdetails=1

gistfile1.js

{
    "address": {
        "administrative": "Paris", 
        "city": "Paris", 
        "country": "France", 
        "country_code": "fr", 
        "county": "Paris", 
        "postcode": "75004", 
        "road": "Rue des Francs Bourgeois", 
        "state": "\u00cele-de-France", 
        "suburb": "Le Marais"
    }, 
    "display_name": "Rue des Francs Bourgeois, Le Marais, Paris, \u00cele-de-France, 75004, France", 
    "lat": "48.8568315605276", 
    "licence": "Data \u00a9 OpenStreetMap contributors, ODbL 1.0. http://www.openstreetmap.org/copyright", 
    "lon": "2.36192599445284", 
    "osm_id": "56040600", 
    "osm_type": "way", 
    "place_id": "53422244"
}