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Why is my Node.js app crashing with unhandled promise rejections?

Unhandled promise rejections happen when a rejected promise is not caught. You can handle this by adding `.catch()` to all promises or using `async/await` with `try/catch`.

In Node.js, unhandled promise rejections occur when a promise is rejected but no .catch() block or try/catch is used to handle the error. This can cause your application to crash, especially in Node.js versions where unhandled rejections are treated as fatal exceptions. To prevent this, you should always ensure that every promise has an error handler. If you are using async/await, wrap your code in try/catch blocks to handle rejections. For promise chains, always append a .catch() to the end of the chain. You can also use global error handling mechanisms like process.on('unhandledRejection', ...) to catch unhandled promise rejections and log or handle them appropriately, though it’s recommended to catch errors at the source. By consistently handling rejected promises, you can prevent crashes and ensure your app behaves predictably in error scenarios.

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