IDBDatabase.createObjectStore()

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

Syntax

IDBDatabase.createObjectStore(name);
IDBDatabase.createObjectStore(name, options);

Parameters

name

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.

Returns

A new IDBObjectStore.

Exceptions

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.

Example

// Let us open our database
var request = window.indexedDB.open("toDoList", 4);

// This handler is called when a new version of the database
// is created, either when one has not been created before
// or when a new version number is submitted by calling
// window.indexedDB.open().
// This handler is only supported in recent browsers.
request.onupgradeneeded = function(event) {
  var db = event.target.result;

  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>";
};

Specifications

Specification
Indexed Database API 3.0 (Indexed DB 3.0) # ref-for-dom-idbdatabase-createobjectstore①

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`createObjectStore`	23	12	10	10	15	7	≤37	25	22	14	8	1.5