jetpack-id 
Takes a Jetpack addon manifest object and returns a properly formatted ID for the addon. Works with cfx and jpm and any Jetpack addon that uses a package.json.
Usage
var getID = require("jetpack-id");
getID({ name: "my-addon" }); // "@my-addon"
getID({ id: "tab-fixer@addon" }); // "tab-fixer@addon"
// Manifest's generated by cfx generate an ID that is invalid -- this
// should be manually changed to be compatable with AMO by appending
// a `@jetpack` at the end, and this module does NOT do that.
getID({ id: "jid1-JtUwP0fsy08AKw" }); // null
Installing
License
MPL 2.0 License, copyright (c) 2014 Jordan Santell