Typo.js is a JavaScript spellchecker that uses Hunspell-style dictionaries.

To use Typo in a Chrome extension, simply include the typo.js file in your extension's background page, and then initialize the dictionary like so:

var dictionary = new Typo("en_US");

To use Typo in a standard web application you need to pass a settings object that provides a path to the folder containing the desired dictionary.

var dictionary = new Typo("en_US", false, false, { dictionaryPath: "typo/dictionaries" }),

If using in node.js, load it like so:

var Typo = require("typo-js");
var dictionary = new Typo([...]);

If you care about memory or cpu usage, you should try this method.

The above methods load the dictionary from hunspell compatible .dic and .aff files. But if you are using node.js or are using a bundler that supports require(...), you can load dictionaries for fast and memory efficient zero-copy-ish files that are precomputed using a script

To load en_US with the included precomputed dictionary files:

var Typo = require("typo-js");
var dictionary = new Typo();
dictionary.loadPrecomputed([...]); // Supports most of the same settings as the constructor

Assuming you installed this as a node module, if you have some other set of .aff and .dic files, precompute the .sst and .json files used by the above technique by running:

./node_modules/.bin/typo-precompute [en_US|other_code] [path/to/dictionaries] using your terminal in your project's root folder

NOTE: The precompute script will require a lot of memory if processing a large dictionary.

To check if a word is spelled correctly, do this:

var is_spelled_correctly = dictionary.check("mispelled");

To get suggested corrections for a misspelled word, do this:

var array_of_suggestions = dictionary.suggest("mispeling");

// array_of_suggestions == ["misspelling", "dispelling", "misdealing", "misfiling", "misruling"]

Typo.js has full support for the following Hunspell affix flags:

• PFX
• SFX
• REP
• FLAG
• COMPOUNDMIN
• COMPOUNDRULE
• ONLYINCOMPOUND
• KEEPCASE
• NOSUGGEST
• NEEDAFFIX

Note: The manifest.json file in the root directory of the project is there to simplify testing, as it allows you to load all of the files in the Typo project as a Chrome extension. It doesn't have any purpose if you're using Typo.js in your own project.

There's a live demo of Typo.js at http://www.chrisfinke.com/files/typo-demo/ and a complete Node.js example file at examples/node/index.js.

Typo.js is free software, licensed under the Modified BSD License.