Indexed Database (IndexedDB) is an API for storing data at client side and a proposed standard, still in the relatively early stages of development. With the IndexedDB API, developers can store data objects within the user’s browser. In this tutorial series we will explore the basics of this emerging technology by building a simple note-keeping facility for a Web page or site. Users will be able to add and delete notes, with past notes automatically displaying when the user revisits. The notes are private to the user as they are stored locally. A typical use for this utility could be on a site with informational content, such as educational material.