Address Autocomplete API from Google is the easiest way to add addresses to your site. You don't need any training to use the API. In addition, you can set filters, validate addresses and limit invalid entries.
The US autocomplete API is free to use. You can create sample cURL requests to see how the feature works. As with other APIs, you'll need a Google account and billing information.
The Google Places Autocomplete API doesn't check whether the street number is valid. This means that you could get dupes or invalid results. However, Google's API is designed to be very convenient and offers a dropdown menu with predictions.
Smarty US Autocomplete Pro is another option to consider. It uses geolocation and open-source data to return relevant results from the first few keystrokes. For example, if you type in "Downtown San Francisco", the API will return a list of addresses in San Francisco, such as "The Standard," "City Hall," and "Union Square."
Some other features of the Smarty US Autocomplete Pro API include: - Geolocation - Open source non-postal address data - User input. You can also choose to limit the results to specific countries.
Depending on your needs, you may want to choose an API provider with full Unicode support. That way, you can display the predictions in the user's native character set.
If you're looking for more precision, you might consider a tool such as the Geoapify Address Autocomplete API. The API is based on open-source data sources and allows you to set up biases by country, radius and more.