This snippet shows how to use IndexedDB

create-object-store-indexeddb.js

// Offline Web Applications course on Udacity https://classroom.udacity.com/courses/ud899

//idb is a plugin that's available to make it easier to work with IndexedDB

//This should all go in a new file, called index.js, in a sub-directory called index-db, or something of the like

//Open a new database, giving it a name, version number and a callback function
var dbPromise = idb.open('test-db', 1, function(upgradeDb) {
  var keyValStore = upgradeDb.createObjectStore('keyval');
  keyValStore.put('world', 'hello'); //Put the value 'world' into key 'hello' (key/value is seeminlgy back-to-front)
});