The get() method of the IDBObjectStore interface returns an IDBRequest object, and, in a separate thread, returns the object selected by the specified key. This is for retrieving specific records from an object store.

If a value is successfully found, then a structured clone of it is created and set as the result of the request object.

key

The key or key range that identifies the record to be retrieved.

An IDBRequest object on which subsequent events related to this operation are fired.

If the operation is successful, the value of the request's result property is the value of the first record matching the given key or key range.

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

TransactionInactiveError DOMException

Thrown if this IDBObjectStore's transaction is inactive.

DataError DOMException

Thrown if key or key range provided contains an invalid key.

InvalidStateError DOMException

Thrown if the IDBObjectStore has been deleted or removed.

In the following code snippet, we open a read/write transaction on our database and get one specific record from object store using get() — a sample record with the key "Walk dog". Once this data object is retrieved, you could then update it using normal JavaScript, then put it back into the database using a IDBObjectStore.put operation. For a full working example, see our To-do Notifications app (view example live).

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

DBOpenRequest.onsuccess = (event) => {
  note.innerHTML += "<li>Database initialized.</li>";

  // store the result of opening the database in the db variable.
  // This is used a lot below
  db = DBOpenRequest.result;

  // Run the getData() function to get the data from the database
  getData();
};

function getData() {
  // open a read/write db transaction, ready for retrieving the data
  const transaction = db.transaction(["toDoList"], "readwrite");

  // report on the success of the transaction completing, when everything is done
  transaction.oncomplete = (event) => {
    note.innerHTML += "<li>Transaction completed.</li>";
  };

  transaction.onerror = (event) => {
    note.innerHTML += `<li>Transaction not opened due to error: ${transaction.error}</li>`;
  };

  // create an object store on the transaction
  const objectStore = transaction.objectStore("toDoList");

  // Make a request to get a record by key from the object store
  const objectStoreRequest = objectStore.get("Walk dog");

  objectStoreRequest.onsuccess = (event) => {
    // report the success of our request
    note.innerHTML += "<li>Request successful.</li>";

    const myRecord = objectStoreRequest.result;
  };
}

• Using IndexedDB
• Starting transactions: IDBDatabase
• Using transactions: IDBTransaction
• Setting a range of keys: IDBKeyRange
• Retrieving and making changes to your data: IDBObjectStore
• Using cursors: IDBCursor
• Reference example: To-do Notifications (View the example live).