Developer guides
Practical, copy-paste tutorials for building Indian apps with free APIs — address forms, IFSC/GSTIN validation, holiday calendars and more. Every example uses real endpoints you can call today.
Build an Indian address form with a free PIN Code API
Auto-fill district and state the moment a user types their 6-digit pincode — no paid service, no API key.
Read guide →Validate IFSC and GSTIN in JavaScript
Catch bad bank and GST numbers before they hit your backend, with a regex pre-check and a free validation API.
Read guide →Free APIs for Indian developers
Every Indian-data API you commonly need — free, keyless, consistent JSON — with a copyable request for each.
Read guide →Build an Indian holiday calendar with a free API
Pull national and gazetted holidays for any year and drop them into a calendar or "next holiday" widget.
Read guide →