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    This article is in need of a technical review.

    The upperOpen property of the IDBKeyRange interface returns a boolean indicating whether the upper-bound value is included in the key range.




    A boolean:

    Value Indication
    true The upper-bound value is not included in the key range.
    false The upper-bound value is included in the key range.


    The following example illustrates how you'd use a key range. Here we declare keyRangeValue = IDBKeyRange.upperBound("F", "W", true, true); — a range that includes everything between "F" and "W" but not including them — since both the upper and lower bounds have been declared as open (true). 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.

    After declaring the key range, we log its upperOpen property value to the console, which should appear as "true": the upper bound is open, so won't be included in the range.

    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.bound("F", "W", true, true);
      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.');


    Specification Status Comment
    Indexed Database API
    The definition of 'upperOpen' 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,