Serverless functions let you run code without managing servers. Pay only for execution time, scale automatically, and focus on business logic.
AWS Lambda Basics
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Vercel Serverless Functions
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Vercel Edge Functions
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Cold Start Optimization
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Environment and Secrets
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Request Validation
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Error Handling
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Middleware Pattern
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Testing Serverless Functions
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Deployment
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Best Practices
Performance:
✓ Initialize outside handler
✓ Use connection pooling
✓ Keep functions small
✓ Set appropriate timeouts
Security:
✓ Validate all inputs
✓ Use secrets manager
✓ Implement proper auth
✓ Set least-privilege IAM
Cost:
✓ Optimize memory settings
✓ Use provisioned concurrency wisely
✓ Monitor execution duration
✓ Clean up resources
Conclusion
Serverless functions simplify deployment and scaling. Focus on cold start optimization, proper error handling, and security. Test locally with tools like SAM or serverless-offline before deploying.