A spellchecker in CoffeeScript/JavaScript based on Hunspell.

You can use spellchecker.js in browser and Node.js/CommonJS environments. spellchecker.js requires a hunspell style dictionary, including the .dic and .aff files. After reading them, you create a SpellChecker instance. SpellCheckers have two major methods: check and suggest for checking if a word is correctly spelled, and for making spelling suggestions for a misspelled word. Here's an example:

fs = require 'fs'
SpellChecker = require './spellchecker'

# load the dictionary files
aff = fs.readFileSync('./en-us/en-us.aff', 'utf8')
dic = fs.readFileSync('./en-us/en-us.dic', 'utf8')

# create a SpellChecker
checker = new SpellChecker(aff, dic)

# check if a word is spelled correctly
checker.check('spelling') # true
checker.check('speling')  # false

# get spelling suggestions
checker.suggest('speling') # ['spelling', 'spline']
checker.suggest('lisence') # ['silence', 'license']

Performance of checking words is generally very good, and suggestions are often fast as well depending on how badly the word is spelled. Performance improvements are always welcome, however! :)

spellchecker.js is released under the MIT license.