Format & Manipulate Numbers With JavaScript: Numeral.js

Numeral.js is a standalone JavaScript library that offers simple-to-advanced formatting and manipulation of numbers.

It works in the client-side or node.js and can transform any number into currency, percentage, time, plain old numbers with decimal places, etc.

And, formatting work both sides, there is also an unformat function to revert formatted values into numbers.

There are also functions for math (adding, subtracting, etc.) and creating multilingual abbreviations.