When a JavaScript error is not properly handled, an uncaughtException is emitted. These suggest the programmer has made an error, and they should be treated with the utmost priority.
The correct use of uncaughtException is to perform synchronous cleanup of allocated resources (e.g. file descriptors, handles, etc) before shutting down the process. It is not safe to resume normal operation after uncaughtException because system becomes corrupted. The best way is to let the application crash, log the error and then restart the process automatically using nodemon or pm2.
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