The NodeList.length property returns the number of items in a NodeList.


An integer value representing the number of items in a NodeList.


The length property is often useful in DOM programming. It's often used to test the length of a list, to see if it exists at all. It's also commonly used as the iterator in a for loop, as in this example.

// All the paragraphs in the document
const items = document.getElementsByTagName("p");

// For each item in the list,
// append the entire element as a string of HTML
let gross = "";
for (const item of items) {
  gross += item.innerHTML;

// gross is now all the HTML for the paragraphs


DOM Standard
# ref-for-dom-nodelist-length①

Browser compatibility

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