IDBFactory

BaselineWidely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

* Some parts of this feature may have varying levels of support.

Note: This feature is available inWeb Workers.

TheIDBFactory interface of theIndexedDB API lets applications asynchronously access the indexed databases. The object that implements the interface iswindow.indexedDB. You open — that is, create and access — and delete a database with this object, and not directly withIDBFactory.

Instance methods

IDBFactory.open(): Requests opening aconnection to a database.
IDBFactory.deleteDatabase(): Requests the deletion of a database.
IDBFactory.cmp(): Compares two keys and returns a result indicating which one is greater in value.
IDBFactory.databases(): Returns a promise that fulfills with an array of all available databases, including their names and versions.

Example

In the following code snippet, we make a request to open a database, and include handlers for the success and error cases. For a full working example, see ourTo-do Notifications app (view example live).

// Let us open version 4 of our databaseconst DBOpenRequest = window.indexedDB.open("toDoList", 4);// these two event handlers act on the database being opened successfully, or notDBOpenRequest.onerror = (event) => {  console.error("Error loading database.");};DBOpenRequest.onsuccess = (event) => {  console.info("Database initialized.");  // store the result of opening the database in the db variable. This is used a lot later on, for opening transactions and suchlike.  db = DBOpenRequest.result;};