OpenCage Guides: recipes for common developer tasks

Background, examples and recipes for common use cases and questions

Reverse Geocoding
All aspects of converting coordinates into location information.
Comparing and testing geocoding services
Evaluating geocoding services.
Geocoding and postal codes
Common questions and misunderstandings related to post codes.

Formatting your geocoding query
Clean up your geocoding queries to get the results you want.
Speed up your geocoding
Run your geocoding faster.
Geocoding large datasets
Points to consider when processing massive volumes of locations.
Geocoding accuracy
Is this the result you are looking for?
Using OpenCage together with other geocoders
Use us for your first pass to dramatically reduce costs.
Limit API results to a certain country or region
Only get the geocoding results you need.
Formatting Addresses
Presenting location information in the format users expect.
Show an imprecise location
Show only a rough or imprecise location to preserve privacy.

Putting results on a map
How to display geocoding results on a map.
Convert image GPS coordinates into location information
How to turn image coordinates into useful location information.
Convert coordinates to country
Determining which country coordinates are located in.
Convert locations to NUTS codes
Find the EU NUTS codes for an address or coordinates.
Determine the ISO codes for a location
Map coordinates or addresses to ISO 3166 codes.
Determine the county for an address
Which county is this address in?
Get the information for a UN/LOCODE
Search for UN/LOCODEs.

Replacing your geocoding API key
How to deactivate an API key and create a new one.
Protect your API key
Best practices for keeping your API key safe.

What is Geosearch?
Helping users turn search queries into locations.
Why is geosearch needed?
Location search is not the same as traditional web search.
Consumer expectations for location search
UX challenges in building a location autosuggest.
Geosearch: Technical Considerations
Technical challenges in building a location autosuggest.