You need to build a middleware that performs multiple operations asynchronously before passing control to the next middleware. How can you ensure that your middleware handles errors effectively and does not hang the application?

  • Implement error handling within the middleware using try-catch blocks and call the next middleware with an error parameter if an error occurs. Use next(err) to propagate the error to Express's default error handler.
  • Avoid error handling in middleware to improve performance, rely on Express's default error handling, and use a timeout to prevent the middleware from hanging indefinitely.
  • Use callbacks instead of promises or async/await for asynchronous operations within the middleware to avoid potential errors, and rely on external tools to monitor and handle errors.
  • Use the process.exit() method to terminate the application if an error occurs within the middleware to prevent it from hanging.
To ensure that a middleware handles errors effectively and does not hang the application, it's best practice to implement error handling within the middleware itself using try-catch blocks and call next(err) to propagate the error to Express's default error handler. Option 2 is not recommended as it bypasses proper error handling, and options 3 and 4 are unconventional and may cause issues.
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