A production process manager for Node.js/Bun applications with built-in load balancing, zero-downtime reloads, and host monitoring.
PM2 is a production process manager for Node.js and Bun applications that keeps applications alive forever, facilitates zero-downtime reloads, and includes a built-in load balancer. It solves the problem of managing and monitoring applications in production environments by providing tools for process management, clustering, log handling, and startup script generation.
Node.js and Bun developers and DevOps engineers who need to deploy, manage, and monitor applications in production with high availability and performance.
Developers choose PM2 for its robust clustering capabilities, zero-downtime reloads, and comprehensive monitoring features, which simplify production deployment and ensure application reliability without complex setup.
Node.js Production Process Manager with a built-in Load Balancer.
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PM2's cluster mode automatically starts multiple Node.js instances and distributes HTTP/TCP/UDP traffic, improving performance and reliability as highlighted in the README's cluster mode section.
The hot reload feature allows seamless application updates without interruption, ensuring high availability for production deployments, as demonstrated by the pm2 reload command.
Supports multiple log formats (standard, raw, JSON) and rotation via the pm2-logrotate module, with commands like pm2 logs for easy access and monitoring.
Automatically creates and configures startup scripts for systemd, upstart, and other init systems, keeping processes alive after server restarts with pm2 startup and pm2 save.
The GNU Affero GPL 3.0 license may require sharing source code modifications, which can be restrictive for proprietary or closed-source commercial projects, as noted in the license section.
Log rotation isn't built-in by default; users must manually install the pm2-logrotate module, adding complexity and an extra step for production readiness.
Advanced monitoring features are tied to PM2+, a paid service promoted in the README, which could lead to vendor lock-in for teams needing full dashboard capabilities.