Check for unhandled promise rejections, memory leaks, or incorrect error handling in your code.

Unexpected crashes in a Node.js app can stem from several underlying causes, each affecting the app’s stability and requiring targeted troubleshooting. Start by checking for unhandled promise rejections, as these are common in async-heavy code and, when unaddressed, can trigger abrupt process termination; recent Node.js versions also emit warnings for unhandled rejections, so use these logs to trace potential issues. Memory leaks are another frequent culprit—tools like Node’s built-in heap snapshots or third-party profilers can help identify objects or variables that aren’t being garbage collected, allowing you to optimize code that may be consuming excessive memory over time. Additionally, ensure that all error handling is correctly set up; lack of proper error handling for asynchronous functions or API calls can leave certain failures unaddressed, causing crashes as the app attempts to process unexpected outcomes. Regularly monitor your logs for insights into where the crashes occur, and consider setting up a process manager like PM2, which can automatically restart the app in case of failures, providing temporary relief as you work to identify and fix the root cause.