How do I add autocomplete for address search?

To add autocomplete for address search, you typically use an address/place autocomplete API from a mapping provider, then show suggestions as the user types.

Common options

• Google Places Autocomplete
• Mapbox Search / Geocoding
• HERE Geocoding & Search
• Algolia Places (less common now)
• OpenStreetMap/Nominatim via your own service or a wrapper

Basic flow

1. User types into an input field.
2. After a few characters, send the query to the autocomplete API.
3. Display returned suggestions in a dropdown.
4. When the user selects one, fetch full address details if needed.
5. Fill your form with the chosen address.

Example with Google Places Autocomplete

Frontend

<input id="address" type="text" placeholder="Enter address" />
<div id="suggestions"></div>

<script>
  let timeout;

  document.getElementById('address').addEventListener('input', (e) => {
    clearTimeout(timeout);
    const query = e.target.value;

    if (query.length < 3) return;

    timeout = setTimeout(async () => {
      const res = await fetch(`/api/address-autocomplete?q=${encodeURIComponent(query)}`);
      const suggestions = await res.json();

      document.getElementById('suggestions').innerHTML = suggestions
        .map(item => `<div class="suggestion" data-id="${item.id}">${item.text}</div>`)
        .join('');
    }, 300);
  });
</script>

Backend example

app.get('/api/address-autocomplete', async (req, res) => {
  const q = req.query.q;

  const apiRes = await fetch(
    `https://maps.googleapis.com/maps/api/place/autocomplete/json?input=${encodeURIComponent(q)}&key=${process.env.GOOGLE_MAPS_API_KEY}`
  );
  const data = await apiRes.json();

  res.json(
    data.predictions.map(p => ({
      id: p.place_id,
      text: p.description
    }))
  );
});

Important tips

• Debounce requests to avoid hitting rate limits.
• Limit input length before querying, e.g. 3+ characters.
• Use session tokens if the provider recommends them.
• Handle selection separately from typed text.
• Secure your API key by proxying requests through your backend when needed.
• Bias results by country or map bounds if relevant.

If you want a quick no-code-ish option

If you’re using a framework like React, many libraries already wrap this:

• @react-google-maps/api
• react-places-autocomplete
• Mapbox autocomplete components

If you tell me your stack, I can show you a ready-to-use example for React, Vue, Angular, plain JS, iOS, or Android.