Liveness and readiness sound similar but answer completely different questions in a Node.js service.
Liveness asks if the process is alive; readiness asks if it can safely handle new work. This guide breaks
down that distinction with practical code examples. The guide is written for backend engineers who care
about deployment safety. It includes concrete code you can adapt directly into an Express or Fastify service.
The advice applies equally well to Next.js API routes running on Node.js. Includes real code, not just theory.
Endurance Softwares covers the full pattern with code samples. https://www.endurancesoftwares.com/blog/
nodejs-health-checks-readiness-liveness-dependency-health-2026
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