github.com/josscrowcroft/accounting.js

accounting.js is a tiny JavaScript library for number, money and currency parsing/formatting. It's lightweight and fully localisable, with zero dependencies, and works great as a nodeJS/npm and AMD/requireJS module.

Check out the accounting.js homepage for demos and documentation!

Please checkout/download the latest stable tag before using in production. Bug reports and pull requests hugely welcome.

Made with love by @josscrowcroft and some excellent contributors.

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Also try:

• money.js - a tiny (1kb) javascript currency conversion library, for web & nodeJS
• open exchange rates - free / open source hourly-updated currency conversion data for everybody

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Changelog

v0.3.2 - Fix package.json dependencies (should be empty object) and tweak comments

v0.3.0

• Rewrote library structure similar to underscore.js for use as a nodeJS/npm and AMD/requireJS module - now you can go npm install accounting, and then var accounting = require("accounting"); in your nodeJS scripts.
• unformat now only attempts to parse the number if it's not already a valid number. Also now aliased as acounting.parse
• Fixed an IE bug in the defaults method

v0.2.2 - Fixed same issue as #Num: #24 in formatNumber; switch to Google Closure Compiler for minified version.

v0.2.1 - Fixed issue #Num: #24 where locally-defined settings object was being modified by formatMoney (still an issue in formatNumber)

v0.2

• Rewrote formatting system for formatMoney and formatColumn, to allow easier/better control of string output
• Separate formats for negative and zero values now supported (optionally) via accounting.settings.currency.format
• Internal improvements and helper methods

v0.1.4 - formatMoney recursively formats arrays; added Jasmine test suite (thx millermedeiros!) and QUnit functionality/speed tests

v0.1.3

• Added configurable settings object for default formatting parameters.
• Added format parameter to control symbol and value position (default "%s%v", or [symbol][value])
• Made methods more consistent in accepting an object as 2nd parameter, matching/overriding the library defaults

v0.1.2

• formatColumn works recursively on nested arrays, eg accounting.formatColumn( [[1,12,123,1234], [1234,123,12,1]] ), returns matching array with inner columns lined up
• Another fix for rounding in formatNumber: .535 now correctly rounds to ".54" instead of ".53"

v0.1.1

• Added toFixed method (accounting.toFixed(value, precision)), which treats floats more like decimals for more accurate currency rounding - now, 0.615 rounds up to $0.62 instead of $0.61
• Minified version preserves semicolons
• Fixed NaN errors when no value in unformat

v0.1 - First version yo

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Here's a neat little preview of formatColumn():

 Original Number:   |  With accounting.js:    |  Different settings:    |    Symbol after value:
 -------------------+-------------------------+-------------------------+-----------------------
 123.5              |     $        123.50     |     HK$         124     |            123.50 GBP
 3456.615           |     $      3,456.62     |     HK$       3,457     |          3,456.62 GBP
 777888.99          |     $    777,888.99     |     HK$     777,889     |        777,888.99 GBP
 -5432              |     $     -5,432.00     |     HK$     (5,432)     |         -5,432.00 GBP
 -1234567           |     $ -1,234,567.00     |     HK$ (1,234,567)     |     -1,234,567.00 GBP
 0                  |     $          0.00     |     HK$          --     |              0.00 GBP

There's more demos and documentation on the accounting.js homepage. Enjoy!