NodeList objects are collections of nodes, usually returned by properties such as Node.childNodes and methods such as document.querySelectorAll().

Although NodeList is not an Array, it is possible to iterate over it with forEach(). It can also be converted to a real Array using Array.from().

However, some older browsers have not implemented NodeList.forEach() nor Array.from(). This can be circumvented by using Array.prototype.forEach() — see this document's Example.

In some cases, the NodeList is live, which means that changes in the DOM automatically update the collection. For example, Node.childNodes is live:

var parent = document.getElementById('parent');
var child_nodes = parent.childNodes;
console.log(child_nodes.length); // let's assume "2"
console.log(child_nodes.length); // outputs "3"

In other cases, the NodeList is static, where any changes in the DOM does not affect the content of the collection. document.querySelectorAll() returns a static NodeList.

It's good to keep this distinction in mind when you choose how to iterate over the items in the NodeList, and if you should cache the list's length.


The number of nodes in the NodeList.


Returns an item in the list by its index, or null if the index is out-of-bounds.
An alternative to accessing nodeList[i] (which instead returns undefined when i is out-of-bounds). This is mostly useful for non-JavaScript languages DOM implementations.
Returns an iterator, allowing code to go through all key/value pairs contained in the collection. (In this case, the keys are numbers starting from 0 and the values are nodes.)
Executes a provided function once per NodeList element, passing the element as an argument to the function.
Returns an iterator, allowing code to go through all the keys of the key/value pairs contained in the collection. (In this case, the keys are numbers starting from 0.)
Returns an iterator allowing code to go through all values (nodes) of the key/value pairs contained in the collection.


It's possible to loop over the items in a NodeList using a for loop:

for (var i = 0; i < myNodeList.length; i++) {
  var item = myNodeList[i];

Don't use for...in or for each...in to enumerate the items in NodeLists, since they will also enumerate its length and item properties and cause errors if your script assumes it only has to deal with element objects. Also, for..in is not guaranteed to visit the properties in any particular order.

for...of loops will loop over NodeList objects correctly:

var list = document.querySelectorAll('input[type=checkbox]');
for (var checkbox of list) {
  checkbox.checked = true;

Recent browsers also support iterator methods (forEach()) as well as entries(), values(), and keys().

There is also an Internet Explorer-compatible way to use Array.prototype.forEach for iteration:

var list = document.querySelectorAll('input[type=checkbox]');
Array.prototype.forEach.call(list, function (checkbox) {
  checkbox.checked = true;


Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes Yes Yes Yes Yes Yes
length 1 12 ? ? ? ?
entries 51 16 50 No 38 10
forEach 51 16 50 No 38 10
item 1 12 ? ? ? ?
keys 51 16 50 No 38 10
values 51 16 50 No 38 10
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support Yes Yes Yes Yes Yes Yes Yes
length Yes Yes ? ? ? ? Yes
entries 51 51 ? 50 ? 10 5.0
forEach 51 51 ? 50 ? 10 5.0
item Yes Yes ? ? ? ? Yes
keys 51 51 ? 50 ? 10 5.0
values 51 51 ? 50 ? 10 5.0

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