Interview Questions and Answers

View engines are used to render dynamic content. Popular view engines for Express include EJS, Pug, and Handlebars.

Session management in Express.js can be implemented using middleware like 'express-session' along with a session store.

'multer' is a middleware used for handling 'multipart/form-data,' primarily used for file uploads. It adds a 'body' object and a 'file' or 'files' object to the 'request' object.

Authentication in Express.js can be implemented using middleware like 'passport' along with relevant strategies (e.g., local strategy, OAuth).

'express-validator' is a set of Express.js middlewares that wraps validator.js validator and sanitizer functions, providing validation and sanitation of user input.

Rate limiting in Express.js can be implemented using middleware such as 'express-rate-limit' to restrict the number of requests from a client in a given time frame.

'compression' is a middleware that compresses the response body for requests that traverse through it, reducing the size of the response and improving performance.

Promises in Express.js are used to handle asynchronous operations, providing a cleaner and more readable way to structure asynchronous code.