Deploy Without Disruption: Zero-Downtime Strategies for React and Node Applications

Zero-downtime deployments have become essential for maintaining user experience and business continuity in 2025. This guide demonstrates how to deploy new versions of React and Node applications while keeping services running, using advanced techniques including PM2 clustering for graceful worker restarts, atomic symlink swaps for React builds, and proper SIGINT handling for connection draining. By implementing these strategies, teams can eliminate deployment downtime and protect users from service interruptions.