I Built a 1-Line Observability Package for Express & Fastify Zero Dependencies, Full TypeScript

📰 Dev.to · Rahul Patel

Learn to build a 1-line observability package for Express & Fastify with zero dependencies and full TypeScript support to monitor performance and errors

intermediate Published 5 Mar 2026
Action Steps
  1. Build a 1-line observability package using TypeScript and Node.js
  2. Configure the package to monitor Express and Fastify routes
  3. Test the package to track slow routes and DB queries
  4. Apply the package to monitor error rates on specific endpoints
  5. Compare the performance of different routes using the package's metrics
Who Needs to Know This

Backend developers and DevOps engineers can benefit from this package to monitor and optimize their Express and Fastify applications

Key Insight

💡 A simple, dependency-free observability package can greatly improve the monitoring and optimization of Express and Fastify applications

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🚀 1-line observability package for Express & Fastify! 📊 Monitor performance, errors, and DB queries with zero dependencies and full TypeScript support 💻

Key Takeaways

Learn to build a 1-line observability package for Express & Fastify with zero dependencies and full TypeScript support to monitor performance and errors

Full Article

Which routes are slow? How many DB queries is this endpoint firing? What's the error rate on /orders...
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