Day 52: How to build a Split-Screen Login & Parse JWTs in AWS Lambda 🔐

📰 Dev.to · Eric Rodríguez

Learn to build a custom split-screen login and parse JWTs in AWS Lambda for a more modern and secure authentication experience

intermediate Published 8 Apr 2026
Action Steps
  1. Build a custom login screen using HTML, CSS, and JavaScript to replace the default Amazon Cognito login screen
  2. Configure AWS Cognito to use a custom login screen
  3. Parse JWTs in AWS Lambda using Node.js to authenticate and authorize users
  4. Test the custom login flow and JWT parsing using Postman or a similar tool
  5. Deploy the custom login screen and AWS Lambda function to a production environment
Who Needs to Know This

This tutorial benefits frontend and backend developers, as well as DevOps engineers, who want to improve the authentication flow and security of their AWS-based applications

Key Insight

💡 Using a custom login screen and parsing JWTs in AWS Lambda can improve the security and user experience of your AWS-based application

Share This
🔐 Customize your AWS Cognito login screen and parse JWTs in AWS Lambda for a more secure authentication experience 💻

Key Takeaways

Learn to build a custom split-screen login and parse JWTs in AWS Lambda for a more modern and secure authentication experience

Full Article

I hated the default Amazon Cognito login screen. It looked like a dashboard from 2015. Today, I...
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