The name property of the IDBIndex interface contains a string which names the index.

Note: This feature is available in Web Workers


var indexName =; = indexName;


A DOMString specifying a name for the index.


There are a several exceptions which can occur when you attempt to change an index's name.


The index, or its object store, has been deleted; or the current transaction is not an upgrade transaction. You can only rename indexes during upgrade transactions; that is, when the mode is "versionchange".


The current transaction is not active.


An index is already using the specified name.


In the following example we open a transaction and an object store, then get the index lName from a simple contacts database. We then open a basic cursor on the index using IDBIndex.openCursor() — this works the same as opening a cursor directly on an IDBObjectStore using openCursor() except that the returned records are sorted based on the index, not the primary key.

The name of the index is logged to the console: it should be returned as lName.

Finally, we iterate through each record, inserting the data into an HTML table. For a complete working example, see our IndexedDB-examples demo repo (View the example live).

function displayDataByIndex() {
  tableEntry.innerHTML = '';
  var transaction = db.transaction(['contactsList'], 'readonly');
  var objectStore = transaction.objectStore('contactsList');

  var myIndex = objectStore.index('lName');

  myIndex.openCursor().onsuccess = function(event) {
    var cursor =;
    if(cursor) {
      var tableRow = document.createElement('tr');
      tableRow.innerHTML =   '<td>' + + '</td>'
                           + '<td>' + cursor.value.lName + '</td>'
                           + '<td>' + cursor.value.fName + '</td>'
                           + '<td>' + cursor.value.jTitle + '</td>'
                           + '<td>' + + '</td>'
                           + '<td>' + cursor.value.eMail + '</td>'
                           + '<td>' + + '</td>'
                           + '<td>' + cursor.value.age + '</td>';

    } else {
      console.log('Entries all displayed.');


Indexed Database API 3.0 (Indexed DB 3.0)
# ref-for-dom-idbindex-name①

Browser compatibility

BCD tables only load in the browser

See also