Geohash
Transform geographic coordinates in the form of latitude and longitude into numerical geohashes.
At Firstclasspostcodes, we use geohashes inside DynamoDB to quickly retrieve matching postcodes for a particular coordinate. Our solution has been adapted from this original blog post and we've extracted some of the code from an existing NPM library to suit our own purposes.
Getting Started
npm i @firstclasspostcodes/geohash --save
Then refer to the documentation here on how to start using it.