refine_geocoder.json will geocode a simple list of addresses from OpenRefine using the HERE and OpenStreetMap Nominatim APIs.
To use the HERE geocoding API, sign up for a free Limited Plan account, which will allow you up to 1,000 geocoding requests per day. (If you need more, you should upgrade to a pay-as-you-go Base plan.) Once you have verified your identity and signed in to the HERE portal, register an app, then copy and save its API key.
refine_geocoder.json fetches JSON for the two APIs, which is parsed using GREL, Refine's expression language, to give columns for latitude and longitude from each service, plus the following:
here_result_type"houseNumber" indicates geocoding to an exact address; "street," indicates geocoding to street only.osm_category"place," "amenity," "office" etc indicate geocoding to an exact address; "highway" indicates geocoding to street only.
Open refine_geocoder.json in a text editor and run a find-and-replace to replace HereKey with your own HERE API key.
Create a new Open Refine project from a text file containing a simple list of addresses/locations, with the extension .tsv and the header row address. See sf_test_addresses.tsv for an example.
Open the Undo/Redo tab in Open Refine, and click the Apply... button. Paste the contents of refine_geocoder.json into the box, click the Perform Operations button and wait for results to appear.
Click the Export button to export your geocoded data in various formats.