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

Note: This feature is available in Web Workers

Instance methods

The current method to request opening a connection to a database.


A method to request the deletion of a database.


A method that compares two keys and returns a result indicating which one is greater in value.


A method that returns a list of all available databases, including their names and versions.


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 our To-do Notifications app (view example live).


// Let us open version 4 of our database
const DBOpenRequest ="toDoList", 4);

// these two event handlers act on the database being opened successfully, or not
DBOpenRequest.onerror = (event) => {
  console.error("Error loading database.");

DBOpenRequest.onsuccess = (event) => {"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;


Indexed Database API 3.0
# factory-interface

Browser compatibility

BCD tables only load in the browser

See also