This is a simple postal code proximity search webservice.
It uses geonames.org as source.
Just start it with go run . and call
http://localhost:3141/?country=DE&zip=80331&max=100
The full documentation of the api is in the OpenAPI documentation.
You can get all options by neargo --help
docker run --rm -p3141:3141 -v ./data:/data ghcr.io/aligator/neargo:latest --geonames-file geonames.zip