Nominatim (OpenStreetMap)

nominatim.openstreetmap.org · Location

Location No Auth Free & Open Geocoding Maps Location

Free geocoding and reverse geocoding from OpenStreetMap — convert addresses to coordinates and coordinates to addresses. No API key required. Must set User-Agent.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Geocode an address

Convert an address to lat/lon.

https://nominatim.openstreetmap.org/search?q=Eiffel Tower, Paris&limit=1&format=json

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

User-Agent

MyApp/1.0 ([email protected])

curl -X GET "https://nominatim.openstreetmap.org/search?q=Eiffel%20Tower%2C%20Paris&limit=1&format=json" \
  -H "User-Agent: MyApp/1.0 ([email protected])"

import requests
params = {
    "q": "Eiffel Tower, Paris",
    "limit": "1",
    "format": "json"
}
headers = {
    "User-Agent": "MyApp/1.0 ([email protected])"
}
response = requests.get(
    "https://nominatim.openstreetmap.org/search",
    params=params,
    headers=headers,
)
print(response.json())

const url = new URL('https://nominatim.openstreetmap.org/search');
url.searchParams.set('q', 'Eiffel Tower, Paris');
url.searchParams.set('limit', '1');
url.searchParams.set('format', 'json');

const response = await fetch(url, {
  headers: {
    'User-Agent': 'MyApp/1.0 ([email protected])'
  },
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://nominatim.openstreetmap.org/search")
	q := baseURL.Query()
	q.Set("q", "Eiffel Tower, Paris")
	q.Set("limit", "1")
	q.Set("format", "json")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)
	req.Header.Set("User-Agent", "MyApp/1.0 ([email protected])")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://nominatim.openstreetmap.org/search")
uri.query = URI.encode_www_form({
  "q" => "Eiffel Tower, Paris",
  "limit" => "1",
  "format" => "json"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)
req["User-Agent"] = "MyApp/1.0 ([email protected])"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://nominatim.openstreetmap.org/search?" . http_build_query([
    "q" => "Eiffel Tower, Paris",
    "limit" => "1",
    "format" => "json"
]);
$opts = ["http" => [
    "method" => "GET",
    "header" => implode("\r\n", [
        "User-Agent: MyApp/1.0 ([email protected])"
    ]),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Reverse geocode

Get an address from latitude/longitude.

https://nominatim.openstreetmap.org/reverse?lat=48.8584&lon=2.2945&format=json

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

User-Agent

MyApp/1.0 ([email protected])

curl -X GET "https://nominatim.openstreetmap.org/reverse?lat=48.8584&lon=2.2945&format=json" \
  -H "User-Agent: MyApp/1.0 ([email protected])"

import requests
params = {
    "lat": "48.8584",
    "lon": "2.2945",
    "format": "json"
}
headers = {
    "User-Agent": "MyApp/1.0 ([email protected])"
}
response = requests.get(
    "https://nominatim.openstreetmap.org/reverse",
    params=params,
    headers=headers,
)
print(response.json())

const url = new URL('https://nominatim.openstreetmap.org/reverse');
url.searchParams.set('lat', '48.8584');
url.searchParams.set('lon', '2.2945');
url.searchParams.set('format', 'json');

const response = await fetch(url, {
  headers: {
    'User-Agent': 'MyApp/1.0 ([email protected])'
  },
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://nominatim.openstreetmap.org/reverse")
	q := baseURL.Query()
	q.Set("lat", "48.8584")
	q.Set("lon", "2.2945")
	q.Set("format", "json")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)
	req.Header.Set("User-Agent", "MyApp/1.0 ([email protected])")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://nominatim.openstreetmap.org/reverse")
uri.query = URI.encode_www_form({
  "lat" => "48.8584",
  "lon" => "2.2945",
  "format" => "json"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)
req["User-Agent"] = "MyApp/1.0 ([email protected])"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://nominatim.openstreetmap.org/reverse?" . http_build_query([
    "lat" => "48.8584",
    "lon" => "2.2945",
    "format" => "json"
]);
$opts = ["http" => [
    "method" => "GET",
    "header" => implode("\r\n", [
        "User-Agent: MyApp/1.0 ([email protected])"
    ]),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

No API key needed
ALWAYS set User-Agent header (required)
Geocode: GET /search?q=Big+Ben,+London&format=json&limit=1
Reverse: GET /reverse?lat=51.5&lon=-0.12&format=json
Limit: 1 request/second — cache results where possible

Open documentation ↗