accounting.js is a tiny JavaScript library for number, money and currency formatting, and excel-style column rendering to line up symbols and decimals. It's lightweight, fully localisable and has zero dependencies.

Check out the plugin homepage (with demos and docs) here: http://josscrowcroft.github.com/accounting.js/

Please checkout / download the latest stable tag before using in a production environment and report any bugs with your setup info!

Roadmap / to-do

• Write some more tests, docs and demos
• Do some optimisations for performance bottlenecks

Changelog

v0.3.0

• Rewrote library structure similar to underscore.js for use as a nodeJS/npm and AMD module - now you can go npm install accounting, and then var accounting = require("accounting"); in your nodeJS scripts.
• It also works with requireJS or any AMD module loader.
• unformat now only attempts to parse the number if it's not already a valid number (to save on processing). It's also aliased as acounting.parse
• Fixed an IE bug in the defaults method
• Numerous other bugfixes and little improvements

v0.2.2

• Fixed same issue as #24 in formatNumber
• accounting.min.js now uses Google Closure Compiler, shaves 0.3kb+ off previous size
• Merged branch gh-pages and master and reshuffled to save hassle

v0.2.1

• Fixed issue #24 where locally-defined settings object was being modified by formatMoney (still an issue in formatNumber, to fix)

v0.2

• Compleat (non-breaking) rewrite of the formatting system for formatMoney and formatColumn, to allow more fine-grained control of string output, still easy as pie
• Separate formats for negative and zero values now supported (optionally) via accounting.settings.currency.format
• Added isArray, isString and isObject helper methods from underscore.js for readability/maintainability

v0.1.5

• Added map() helper method based on underscore.js's _.map(), for array iteration, falls back to native Array.map if available.

v0.1.4

• Added helper method defaults to extend an object's empty properties with a defaults object
• API methods now use defaults() to give more structure to the second-parameter-object method style: parameters are normalised into an opts object inside each method
• Settings object at top of library for readibility
• formatMoney now recursively formats arrays
• Added Jasmine test suite (thx millermedeiros!) and QUnit functionality + speed tests

v0.1.3

• Refactored library codebase to use a configurable settings object for default formatting parameters, which paves the way for plugins later on.
• 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 now works recursively on nested arrays, eg accounting.formatColumn( [[1,12,123,1234], [1234,123,12,1]] ), returning back a matching array with inner columns lined up
• Another fix for rounding in formatNumber: 54324.535 now 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 now preserves semicolons
• Fixed NaN errors when no value in unformat - revisit later on

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Still not convinced? Here's a little preview of accounting.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 on the plugin homepage: http://josscrowcroft.github.com/accounting.js/