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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,