Question

How to convert post code to city name, is there an API available?

Answer 1

You need a service that does geocoding.

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Yahoo’s Geocoder API is getting much better results globally.

110021 is the postal code for New Delhi among several other places in the world.

This seems to get them all.

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Google Maps API is another such service but I’m not happy with the geocoded results as I don’t get all results back for 110021.

geocoder = new google.maps.Geocoder();
geocoder.geocode({ 'address': '110021'}, function(results, status) {
    console.log(results);
});