IDBObjectStore: put() method
============================

The **`put()`** method of the `IDBObjectStore` interface updates a given record in a database, or inserts a new record if the given item does not already exist.

It returns an `IDBRequest` object, and, in a separate thread, creates a structured clone of the value and stores the cloned value in the object store. This is for adding new records, or updating existing records in an object store when the transaction's mode is `readwrite`. If the record is successfully stored, then a success event is fired on the returned request object with the `result` set to the key for the stored record, and the `transaction` set to the transaction in which this object store is opened.

 The put method is an *update or insert* method.
 See the `IDBObjectStore.add` method for an *insert only* method.

 Bear in mind that if you have a `IDBCursor` to the record you
 want to update, updating it with `IDBCursor.update()` is preferable to
 using `IDBObjectStore.put()`. Doing so makes it clear that an existing
 record will be updated, instead of a new record being inserted.

**Note:** This feature is available in Web Workers

Syntax
------


```js
put(item)
put(item, key)
```

### Parameters

`item`

The item you wish to update (or insert).

`key` Optional

 The primary key of the record you want to update (e.g. from
 `IDBCursor.primaryKey`).


### Return value

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 key for the new or updated record.

### Exceptions

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

`ReadOnlyError` `DOMException`

Thrown if the transaction associated with this operation is in read-only mode.

`TransactionInactiveError` `DOMException`

Thrown if this `IDBObjectStore`'s transaction is inactive.

`DataError` `DOMException`

Thrown if any of the following conditions apply:

* The object store uses in-line keys or has a key generator, and a `key` parameter was provided.
* The object store uses out-of-line keys and has no key generator, and no `key` parameter was provided.
* The object store uses in-line keys but no `key` generator, and the object store's key path does not yield a valid key.
* The `key` parameter was provided but does not contain a valid key.

`InvalidStateError` `DOMException`

Thrown if the `IDBObjectStore` has been deleted or removed.

`DataCloneError` `DOMException`

Thrown if the data being stored could not be cloned by the internal structured cloning algorithm.

Examples
--------

 The following example requests a given record title; when that request is successful
 the `onsuccess` function gets the associated record from the
 `IDBObjectStore` (made available
 as `objectStoreTitleRequest.result`), updates
 one property of the record, and then puts the updated record back into the object
 store in another request with `put()`. For a full working example, see
 our To-do Notifications app
 (view example live).


```js
const title = "Walk dog";

// Open up a transaction as usual
const objectStore = db
  .transaction(["toDoList"], "readwrite")
  .objectStore("toDoList");

// Get the to-do list object that has this title as it's title
const objectStoreTitleRequest = objectStore.get(title);

objectStoreTitleRequest.onsuccess = () => {
  // Grab the data object returned as the result
  const data = objectStoreTitleRequest.result;

  // Update the notified value in the object to "yes"
  data.notified = "yes";

  // Create another request that inserts the item back into the database
  const updateTitleRequest = objectStore.put(data);

  // Log the transaction that originated this request
  console.log(
    `The transaction that originated this request is ${updateTitleRequest.transaction}`,
  );

  // When this new request succeeds, run the displayData() function again to update the display
  updateTitleRequest.onsuccess = () => {
    displayData();
  };
};
```

Specifications
--------------

| Specification |
| --- |
| Indexed Database API 3.0 # ref-for-dom-idbobjectstore-put① |

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

See also
--------

* 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).