https://github.com/tk120404/gst

GSTIN regex and GST checksum validation. Verify/Validate the gstin number using the regex and checksum functions available in various programming languages
https://github.com/tk120404/gst

checksum checksum-validator gst gst-validator gstchecksum gstin india javascript python regex validation

Last synced: 15 days ago
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GSTIN regex and GST checksum validation. Verify/Validate the gstin number using the regex and checksum functions available in various programming languages

• Host: GitHub
• URL: https://github.com/tk120404/gst
• Owner: tk120404
• License: apache-2.0
• Created: 2019-02-01T04:52:08.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-02-12T10:26:11.000Z (over 6 years ago)
• Last Synced: 2025-03-31T05:41:26.259Z (about 2 months ago)
• Topics: checksum, checksum-validator, gst, gst-validator, gstchecksum, gstin, india, javascript, python, regex, validation
• Language: Swift
• Homepage:
• Size: 23.4 KB
• Stars: 10
• Watchers: 2
• Forks: 3
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# GSTIN regex and its checksum

GSTIN regex 

### `\d{2}[A-Z]{5}\d{4}[A-Z]{1}[A-Z\d]{1}[Z]{1}[A-Z\d]{1}`

![](https://i.stack.imgur.com/YdvSA.png)

#### Format details

* First 2 digits of the GST Number will represent State Code as per the Census (2011).

* Next 10 digits will be same as in the PAN number of the taxpayer.

* First five will be alphabets

* Next four will be numbers

* Last will be check code

* The 13th digit will be the number of registration you take within a state i.e. after 9, A to Z is considered as 10 to 35 .

* 14th digit will be Z by default.

* Last would be the check code.

How to decode the [GST CheckSum](https://medium.com/@dhananjaygokhale/decoding-gst-number-checksum-digit-1ef2c8c53ad6)

* [Javascript checksum verification](https://github.com/tk120404/gst/blob/master/gstChecksum.js) 

* [Python Checksum verification](https://github.com/tk120404/gst/blob/master/gstChecksum.py)

* [Swift Checksum verification](https://github.com/tk120404/gst/blob/master/gstChecksum.swift)