IDBVersionChangeEvent: newVersion property

Note: This feature is available in Web Workers.

The newVersion read-only property of the IDBVersionChangeEvent interface returns the new version number of the database.


A number that is a 64-bit integer or null if the database is being deleted.


In the following code snippet, we make a request to open a database, and include handlers for the success and error cases. These events are fired via the custom IDBVersionChangeEvent interface. For a full working example, see our To-do Notifications app (view example live).

const note = document.querySelector("ul");

// Let us open version 4 of our database
const DBOpenRequest ="toDoList", 4);

// these two event handlers act on the database being opened
DBOpenRequest.onerror = (event) => {
  note.appendChild(document.createElement("li")).textContent =
    "Error loading database.";

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 later on, for opening transactions and suchlike.
  const db = DBOpenRequest.result;


Indexed Database API 3.0
# dom-idbversionchangeevent-newversion

Browser compatibility

BCD tables only load in the browser

See also