Test IndexedDB's webkitIDBObjectStore.deleteObjectStore(). On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". webkitIndexedDB.open('objectstore-removeobjectstore') db = event.target.result db.setVersion('new version') trans = event.target.result PASS trans !== null is true Deleted all object stores. store = db.createObjectStore('storeName', null) store.createIndex('indexName', '') PASS store.indexNames.contains('indexName') is true store.add('value', 'key') db.transaction({mode: webkitIDBTransaction.READ_WRITE}) store = transaction.objectStore('storeName') store.get('key') PASS event.target.result is "value" db.setVersion('new version') trans = event.target.result PASS trans !== null is true db.deleteObjectStore('storeName') db.createObjectStore('storeName', null) db.transaction({mode: webkitIDBTransaction.READ_WRITE}) store = transaction.objectStore('storeName') store.get('key') PASS event.target.result is undefined PASS event.target.source.indexNames.contains('indexName') is false PASS successfullyParsed is true TEST COMPLETE