Zip code of all countries in the world along with cities in CSV, TXT, SQL DATABASE

Getting distance between zip code and user's location based on IP address. User need to provide list of zip codes as JSON object. Script will go through each zip code, get latitude/longitude for each zip code, calculate distance between user lat/lng and zip code lat/lng. Response will be a JSON object where the key is the zip code and the value …

Code to create a Pairwise Zip code Distance Matrix and use an index lookup. This is a tiny utility I built, for use in my work, but I figured it might be helpful to anyone else dealing with zip/postal code distances