The createObjectStore() method of the IDBDatabase interface creates and returns a new object store or index.

The method takes the name of the store as well as a parameter object that lets you define important optional properties. You can use the property to uniquely identify individual objects in the store. As the property is an identifier, it should be unique to every object, and every object should have that property.

This method can be called only within a versionchange transaction.

Note: This feature is available in Web Workers.


var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });


The newly created object store.


This method may raise a DOMException with a DOMError of one of the following types:

Exception Description
InvalidStateError Occurs if the method was not called from a versionchange transaction callback. For older WebKit browsers, you must call first.
TransactionInactiveError Occurs if a request is made on a source database that doesn't exist (e.g. has been deleted or removed.) In Firefox previous to version 41, an InvalidStateError was raised in this case as well, which was misleading; this has now been fixed (see bug 1176165.)
ConstraintError An object store with the given name (based on case-sensitive comparison) already exists in the connected database.
InvalidAccessError If autoIncrement is set to true and keyPath is either an empty string or an array containing an empty string.


// Let us open our database
 var request ="toDoList", 4);

 // This event handles the event whereby a new version of the database needs to be created
 // Either one has not been created before, or a new version number has been submitted via the
 // line above
 //it is only implemented in recent browsers
 request.onupgradeneeded = function(event) {
   var db =;

   db.onerror = function(event) {
     note.innerHTML += '<li>Error loading database.</li>';

   // Create an objectStore for this database

   var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });

   // define what data items the objectStore will contain

   objectStore.createIndex("hours", "hours", { unique: false });
   objectStore.createIndex("minutes", "minutes", { unique: false });
   objectStore.createIndex("day", "day", { unique: false });
   objectStore.createIndex("month", "month", { unique: false });
   objectStore.createIndex("year", "year", { unique: false });

   objectStore.createIndex("notified", "notified", { unique: false });

   note.innerHTML += '<li>Object store created.</li>';


The name of the new object store to be created. Note that it is possible to create an object store with an empty name.
optionalParameters Optional

An options object whose attributes are optional parameters to the method. It includes the following properties:

Attribute Description
keyPath The key path to be used by the new object store. If empty or not specified, the object store is created without a key path and uses out-of-line keys. You can also pass in an array as a keyPath.
autoIncrement If true, the object store has a key generator. Defaults to false.

Unknown parameters are ignored.


Specification Status Comment
Indexed Database API
The definition of 'createObjectStore()' in that specification.
Editor's Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 23webkit
10 moz
16.0 (16.0)
10, partial 15 7.1
Available in workers (Yes) 37.0 (37.0) ? (Yes) ?
Feature Android Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support 4.4 22.0 (22.0) 1.0.1 10 22 8
Available in workers (Yes) 37.0 (37.0) (Yes) ? (Yes) ?

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API createObjectStore Database IDBDatabase IndexedDB Method Reference Référence Storage storage