Question Bank

How do you implement request logging in Express.js for production monitoring?

Express.js automatically sanitizes user input to prevent security vulnerabilities.

How do you implement request validation middleware in Express.js?

How do you implement health check endpoints for monitoring Express.js applications?

Express.js supports streaming responses using the res.write() method.

Using `res.send()` multiple times in the same route handler will send multiple responses to the client.

Error-handling middleware can recover from an error and continue processing the request by calling next() without arguments.

The order of route definitions in Express.js doesn't matter because Express matches all routes simultaneously.

What is the purpose of using process managers like PM2 with Express.js applications?

Middleware defined with `app.use()` without a path will execute for every request including static file requests.

You can mount an Express application as a sub-application within another Express application.

How do you implement proper API documentation for Express.js applications?

Express.js automatically handles uncaught promise rejections in async route handlers.

In Express.js, if you call `next('route')`, it will skip to the next route handler, bypassing remaining middleware in the current route.

How would you implement custom body parsing middleware for a content type not supported by Express.js?

What is middleware chaining and why is it important in Express.js?

How would you implement a logging middleware that tracks request processing time?

How do optional and catch-all route segments work in Express.js?

What is the purpose of the `extended` option in `express.urlencoded()` middleware?

What is the best practice for handling asynchronous errors in Express.js route handlers?