IDBObjectStore: indexNames property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

Note: This feature is available inWeb Workers.

TheindexNames read-only property of theIDBObjectStore interface returns a list of the names ofindexes on objectsin this object store.

In the following code snippet, we open a read/write transaction on our database and addsome data to an object store usingadd(). After the object store has beencreated, we logobjectStore.indexNames to the console. For a full working example, seeourTo-do Notifications app(view example live).

// Let us open our databaseconst DBOpenRequest = window.indexedDB.open("toDoList", 4);DBOpenRequest.onsuccess = (event) => {  note.appendChild(document.createElement("li")).textContent =    "Database initialized.";  // store the result of opening the database in the db variable.  // This is used a lot below  db = this.result;  // Run the addData() function to add the data to the database  addData();};function addData() {  // Create a new object ready to insert into the IDB  const newItem = [    {      taskTitle: "Walk dog",      hours: 19,      minutes: 30,      day: 24,      month: "December",      year: 2013,      notified: "no",    },  ];  // open a read/write db transaction, ready for adding the data  const transaction = db.transaction(["toDoList"], "readwrite");  // report on the success of the transaction completing, when everything is done  transaction.oncomplete = (event) => {    note.appendChild(document.createElement("li")).textContent =      "Transaction completed.";  };  transaction.onerror = (event) => {    note.appendChild(document.createElement("li")).textContent =      "Transaction not opened due to error. Duplicate items not allowed.";  };  // create an object store on the transaction  const objectStore = transaction.objectStore("toDoList");  console.log(objectStore.indexNames);  // Make a request to add our newItem object to the object store  const objectStoreRequest = objectStore.add(newItem[0]);  objectStoreRequest.onsuccess = (event) => {    // report the success of our request    note.appendChild(document.createElement("li")).textContent =      "Request successful.";  };}