Test IndexedDB's createObjectStore's various options On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". dbname = "create-object-store-options.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) db.createObjectStore('a', {keyPath: 'a'}) db.createObjectStore('b') db.createObjectStore('c', {autoIncrement: true}); trans = db.transaction(['a', 'b'], 'readwrite') PASS trans.mode is "readwrite" trans.objectStore('a').put({'a': 0}) Expecting TypeError exception from db.createObjectStore('d', 'bar'); PASS Exception was thrown. PASS db.createObjectStore('d', 'bar'); threw TypeError: Failed to execute 'createObjectStore' on 'IDBDatabase': The provided value is not of type 'IDBObjectStoreParameters'. Expecting TypeError exception from db.createObjectStore('e', false); PASS Exception was thrown. PASS db.createObjectStore('e', false); threw TypeError: Failed to execute 'createObjectStore' on 'IDBDatabase': The provided value is not of type 'IDBObjectStoreParameters'. trans.objectStore('b').put({'a': 0}, 0) trans.objectStore('a').get(0) PASS event.target.result.a is {a: 0} trans.objectStore('b').get(0) PASS event.target.result.a is {a: 0} PASS successfullyParsed is true TEST COMPLETE