Coding⏱️ 3 min read📅 2026-06-19

How to Fix: Using postman in my Mac, I have fill in the password, when I request the API why still get the password did not fill error?

Error when filling password in Postman on Mac API request

Quick Answer: Check if the 'Send request with credentials' option is enabled and select the correct authentication type for your API.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

When using Postman on a Mac to request an API, filling in the password before sending the request may not always work as expected. This issue affects users who are trying to authenticate with APIs that require a password-based authentication method.

This error can be frustrating for developers and testers who rely on Postman for their daily tasks. However, don't worry, we're here to help you troubleshoot and resolve this issue.

⚠️ Common Causes

  • The primary reason why the password is not being filled in correctly is due to the way Postman handles authentication settings. When you enter a username and password in the 'Authorization' tab of your request, it may not be properly configured to fill in the credentials for subsequent requests.
  • Alternatively, if you are using a proxy server or a VPN connection that intercepts your API requests, it may also interfere with Postman's ability to fill in the password.

🚀 How to Resolve This Issue

Using the 'Send with Credentials' checkbox

  1. Step 1: Step 1: Open Postman and go to the 'Settings' menu. Click on 'API Settings'.
  2. Step 2: Step 2: In the 'API Settings' window, click on the 'Authentication' tab.
  3. Step 3: Step 3: Select 'Basic Authentication' from the dropdown menu and check the box next to 'Send with credentials on subsequent requests'.
  4. Step 4: Step 4: Save your changes and try sending the request again. The password should now be filled in correctly for subsequent requests.

Using environment variables

  1. Step 1: Step 1: Open Postman and go to the 'Settings' menu. Click on 'API Settings'.
  2. Step 2: Step 2: In the 'API Settings' window, click on the 'Environments' tab.
  3. Step 3: Step 3: Create a new environment variable with your API credentials (username and password).
  4. Step 4: Step 4: In the 'Request' tab, click on the 'Environment Variables' button. Select the environment variable you created in Step 3 and fill in the username and password fields. The password should now be filled in correctly for subsequent requests.

💡 Conclusion

By following these steps, you should be able to resolve the issue of Postman not filling in your API credentials. Remember to always check your authentication settings and ensure that any proxy servers or VPN connections are properly configured. If you're still having trouble, feel free to reach out to our support team for further assistance.

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