What happens if a node/express server gets an error/crashes in production?

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  • PM2

    Node.js Production Process Manager with a built-in Load Balancer.

  • Usually, you have something that restarts it for you. This is what a "process manager" is for, e.g. https://www.npmjs.com/package/pm2 But in most more advanced systems, this is taken care of for you differently. E.g. lambdas are restarted automatically based on how many instances are needed. If you are in container-land, there's usually a health check endpoint on your server that gets pinged by the container orchestrator, and if there's no response, it will kill and redeploy the container.

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