Software⏱️ 2 min read📅 2026-05-31

How to Fix: Error Message: MongoError: bad auth Authentication failed through URI string

Learn how to fix: Error Message: MongoError: bad auth Authentication failed through URI string.

Quick Answer: Try checking your system settings or restarting.

The error message 'MongoError: bad auth Authentication failed through URI string' indicates that the authentication credentials provided in the connection string are incorrect or malformed. This could be due to a few reasons such as:

💡 Why You Are Getting This Error

  • The password is incorrect or contains special characters that are not allowed in the connection string.
  • The username or password is missing from the connection string.

🔧 Proven Troubleshooting Steps

Method 1: Verify Connection String

  1. Step 1: Check the connection string for any typos or incorrect characters.

Method 2: Use Mongoose Options

  1. Step 1: Use the `authSource` option to specify the authentication source.
  2. Step 2: Set the `authDatabase` option to match the database you are trying to connect to.

🎯 Final Words

To resolve this issue, ensure that your connection string is correct and contains the required authentication credentials. If you are still experiencing issues, try using the `authSource` option to specify the authentication source and set the `authDatabase` option to match the database you are trying to connect to.

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