Coding⏱️ 2 min read📅 2026-05-31

How to Fix: String.prototype.replaceAll() not working

Replace all occurrences of a string in JavaScript using the replace() method.

Quick Answer: Use the replace() method with a regular expression to replace all occurrences of the string, e.g. var a = '::::::'; a = a.replace(/:/g, 'hi');

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

The String.prototype.replaceAll() method is not working as expected in your code because it's case-sensitive. The colon (:) in the original string '::::::' is different from the colon you're trying to replace, which is ':'. This means that only the first occurrence of ':' is being replaced.

💡 Why You Are Getting This Error

  • [Cause]

🔧 Proven Troubleshooting Steps

Method 1: Using a Regular Expression

  1. Step 1: Replace the colon with a regular expression using the replace() method.

Method 2: Using the String.replace() Method with a Case-Insensitive Flag

  1. Step 1: Use the i flag at the end of the replace() method to make it case-insensitive.

✨ Wrapping Up

By applying one of these methods, you should be able to replace all occurrences of the colon in your string.

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