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    This article is in need of a technical review.

    The upperBound() method of the IDBKeyRange interface creates a new upper-bound key range.

    By default, it includes the upper endpoint value and is closed.


    myKeyRange = IDBKeyRange.upperBound("Z", true);


    IDBKeyRange: The newly created key range.


    This method may raise a DOMException with a DOMError of the following type:

    Exception Description

    The value parameter passed was not a valid key.


    The following example illustrates how you'd use a lower bound key range. Here we declare keyRangeValue = IDBKeyRange.upperBound("M", true); — a range that includes the value "M" and everything before it. We open a transaction (using IDBTransaction) and an object store, and open a Cursor with IDBObjectStore.openCursor, declaring keyRangeValue as its optional key range value. This means that the cursor will only retrieve the record with the key value "M" and all that come before it. If we used IDBKeyRange.upperBound("M", true);, then the range would not include "M"; only the values before it.

    Note: For a more complete example allowing you to experiment with key range, have a look at our IDBKeyRange-example repo (view the example live too.)

    function displayData() {
      var keyRangeValue = IDBKeyRange.upperBound("F");
      var transaction = db.transaction(['fThings'], 'readonly');
      var objectStore = transaction.objectStore('fThings');
      objectStore.openCursor(keyRangeValue).onsuccess = function(event) {
        var cursor =;
          if(cursor) {
            var listItem = document.createElement('li');
            listItem.innerHTML = '<strong>' + cursor.value.fThing + '</strong>, ' + cursor.value.fRating;
          } else {
            console.log('Entries all displayed.');


    The value of the upper bound of the range.
    Optional. If false (default value), the range includes the lower-bound value.


    Specification Status Comment
    Indexed Database API
    The definition of 'upperBound()' 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,