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WithoutBook LIVE Mock Interviews Express.js Related interview subjects: 19

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Ques 3

Explain the purpose of the 'multer' middleware in Express.js.

'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.
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Ques 5

Explain the purpose of the 'express-validator' library in Express.js.

'express-validator' is a set of Express.js middlewares that wraps validator.js validator and sanitizer functions, providing validation and sanitation of user input.
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Ques 6

How can you implement rate limiting in Express.js?

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.
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Ques 7

What is the purpose of the 'compression' middleware in Express.js?

'compression' is a middleware that compresses the response body for requests that traverse through it, reducing the size of the response and improving performance.
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Ques 8

Explain the concept of 'Promise' in the context of asynchronous operations in Express.js.

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