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    This article is in need of a technical review.

    The onupgradeneeded property of the IDBOpenDBRequest interface is the event handler for the upgradeneeded event, triggered when a database of a bigger version number than the existing stored database is loaded.

    Inside the event handler function you can include code to upgrade the database structure, as shown in the example below.


    var request ="toDoList", 4);
    request.onupgradeneeded = function(event) { ... };


    In the following example you can see the onupgradeneeded handler being used to update the database structure if a database with a higher version number is loaded. For a full working example, see our To-do Notifications app (view example live.)

    var db;
    // Let us open our database
    var DBOpenRequest ="toDoList", 4);
    // these two event handlers act on the database being opened successfully, or not
    DBOpenRequest.onerror = function(event) {
      note.innerHTML += '<li>Error loading database.</li>';
    DBOpenRequest.onsuccess = function(event) {
      note.innerHTML += '<li>Database initialised.</li>';
      // store the result of opening the database in the db variable. This is used a lot below
      db = DBOpenRequest.result;
      // Run the displayData() function to populate the task list with all the to-do list data already in the IDB
    // This event handles the event whereby a new version of the database needs to be created
    // Either one has not been created before, or a new version number has been submitted via the
    // line above
    //it is only implemented in recent browsers
    DBOpenRequest.onupgradeneeded = function(event) {
      var db =;
      db.onerror = function(event) {
        note.innerHTML += '<li>Error loading database.</li>';
      // Create an objectStore for this database   
      var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });
      // define what data items the objectStore will contain
      objectStore.createIndex("hours", "hours", { unique: false });
      objectStore.createIndex("minutes", "minutes", { unique: false });
      objectStore.createIndex("day", "day", { unique: false });
      objectStore.createIndex("month", "month", { unique: false });
      objectStore.createIndex("year", "year", { unique: false });
      objectStore.createIndex("notified", "notified", { unique: false });


    Specification Status Comment
    Indexed Database API
    The definition of 'onupgradeneeded' in that specification.
    Candidate Recommendation  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 23webkit
    10 moz
    16.0 (16.0)
    10, partial 15 7.1
    Feature Android Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support 4.4 22.0 (22.0) 1.0.1 10 22 Not supported

    See also

    Document Tags and Contributors

    Contributors to this page: fscholz, chrisdavidmills
    Last updated by: fscholz,