Format numbers with commas in the Indian numbering system

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When formatting numbers with commas, the Indian sub-continent (Bangladesh, India, Nepal, Maldives, Pakistan, Sri Lanka) has a peculiar system. Instead of grouping numbers every 3 digits, it uses a repeating pattern of 3,2,2 digits. The first comma is after the third digit, in the thousand's place. One hundred thousand is expressed as one lac (or one lakh). One hundred lacs is expressed as one crore. This pattern repeats itself. As an example, 1 trillion is written as: 100,000,00,00,000. It is read as "one lac crore".
You can read about it on Wikipedia here: Indian numbering system
This modules lets you format numbers according to the Indian numbering system.


Install the package in the usual way:
npm install --save indian-number-format


Require the package like so:
const fmt = require('indian-number-format')

The module exposes two functions:
  1. format(numberToFormat)
  2. formatFixed(numberToFormat, decimals)

The parameter numberToFormat can be any number: a primitive number, string or a Number object. If it is anything other than a number, it is returned unchanged. The first function formats the number with commas. The second function does the same but also converts it to a number with the specified number of decimal points.


const fmt = require('indian-number-format')

// format
console.log(fmt.format(270371))                 // prints: 2,70,371
console.log(fmt.format(123456789327.6452))      // prints: 12,345,67,89,327.6452

// formatFixed
console.log(fmt.formatFixed(1234567.2369, 2))   // prints: 1,23,4567.24
console.log(fmt.formatFixed(1234, 2))           // prints: 1,234.00
console.log(fmt.formatFixed(12.6))              // prints: 13

// return non-numeric input unchanged
console.log(fmt.format(null))                   // prints: null
console.log(fmt.format(true))                   // prints: true
console.log(fmt.format(''))                     // prints the empty string

// has the same idiosyncrasies of parseFloat
console.log(fmt.format('10abcd'))               // prints: 10


This is a simple module. There is extensive test coverage. I intentionally used ES5 Javascript to avoid the need to transpile to browser compatible Javascript.


Thanks to my employer Dynamic Solution Innovators for allowing me to open source this module.