Jede Adresse finden,
während getippt wird.

const API = "https://api.overpass.ch/v1/IHR_SCHLÜSSEL/geocode";
const input = document.querySelector("#search");
let timer, latest = 0;

input.addEventListener("input", () => {
  clearTimeout(timer);
  timer = setTimeout(async () => {   // warten, bis eine Pause entsteht
    const q = input.value.trim();
    if (q.length < 3) return;
    const id = ++latest;
    const res = await fetch(`${API}/api?q=${encodeURIComponent(q)}&limit=5`);
    const { features } = await res.json();
    if (id !== latest) return;       // eine neuere Antwort ist unterwegs
    for (const f of features) {
      const p = f.properties;
      console.log(p.name ?? p.street, p.postcode, p.city, f.geometry.coordinates);
    }
  }, 250);
});

<!-- Leaflet mit leaflet-control-geocoder -->
<script>
L.Control.geocoder({
  geocoder: L.Control.Geocoder.photon({
    serviceUrl: "https://api.overpass.ch/v1/IHR_SCHLÜSSEL/geocode/api/",
    reverseUrl: "https://api.overpass.ch/v1/IHR_SCHLÜSSEL/geocode/reverse/",
  }),
}).addTo(map);
</script>

from geopy.geocoders import Nominatim, Photon

KEY = "IHR_SCHLÜSSEL"
nominatim = Nominatim(domain=f"api.overpass.ch/v1/{KEY}/nominatim", user_agent="my-app")
place = nominatim.geocode("Bundesplatz 3, Bern", addressdetails=True)
print(place.address, place.latitude, place.longitude)

photon = Photon(domain=f"api.overpass.ch/v1/{KEY}/geocode", user_agent="my-app")
print(photon.reverse("47.3769, 8.5417"))

# Photon: Suche, strukturierte Suche, rückwärts
curl 'https://api.overpass.ch/v1/IHR_SCHLÜSSEL/geocode/api?q=Bundesplatz%203%2C%20Bern&limit=3'
curl 'https://api.overpass.ch/v1/IHR_SCHLÜSSEL/geocode/structured?street=Rue%20du%20Rh%C3%B4ne&housenumber=42&city=Gen%C3%A8ve'
curl 'https://api.overpass.ch/v1/IHR_SCHLÜSSEL/geocode/reverse?lat=46.9465&lon=7.4443'

# Nominatim: Suche und rückwärts, Format json, jsonv2 oder geojson
curl 'https://api.overpass.ch/v1/IHR_SCHLÜSSEL/nominatim/search?q=Rheinfall&format=jsonv2'
curl 'https://api.overpass.ch/v1/IHR_SCHLÜSSEL/nominatim/reverse?lat=46.9465&lon=7.4443&format=jsonv2'