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Home / Interview Subjects / Express.js
WithoutBook LIVE Mock Interviews Express.js Related interview subjects: 19

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Know the top Express.js interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top Express.js interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Ques 4

Explain routing in Express.js.

Routing refers to how an application’s endpoints (URIs) respond to client requests. In Express, you can define routes to handle different HTTP methods and URL patterns.
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Ques 10

What is the purpose of the Express.js 'app.listen()' method?

The 'app.listen()' method is used to bind and listen for connections on the specified host and port. It starts the Express.js application.
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Ques 11

Explain the difference between PUT and PATCH HTTP methods in the context of Express.js.

PUT is used to update or create a resource entirely, while PATCH is used to apply partial modifications to a resource.
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Ques 18

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

'helmet' is a middleware that helps secure Express.js applications by setting various HTTP headers to prevent common web vulnerabilities.
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Ques 22

Explain the purpose of the 'express.urlencoded()' middleware.

'express.urlencoded()' is a middleware that parses incoming requests with URL-encoded payloads and is based on the 'body-parser' library.
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Experienced / Expert level questions & answers

Ques 25

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 27

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 28

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 29

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 30

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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