Coding⏱️ 2 min read📅 2026-05-31

How to Fix: forEach is not a function error with JavaScript array

The error occurs because the children property is not an array. It could be a DOM element or null.

Quick Answer: Check if parent.children is indeed an array before calling forEach.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

To resolve the "forEach is not a function" error when looping through an array in JavaScript, you need to ensure that the array property being accessed is indeed an array. In this case, parent.children appears to be an HTMLCollection.

🔍 Why This Happens

  • [Cause]

🚀 How to Resolve This Issue

Method 1: Using Array.from() or spread operator

  1. Step 1: Convert the HTMLCollection to an array using Array.from(parent.children).

Method 2: Using spread operator

  1. Step 1: Use the spread operator parent.children [...] to convert the HTMLCollection to an array.

🎯 Final Words

By applying one of these methods, you can successfully loop through the elements of parent.children using the forEach method.

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