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Express.js Interview Questions and Answers

Test your skills through the online practice test: Express.js Quiz Online Practice Test

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Ques 6. Explain the difference between res.send() and res.json() in Express.js.

res.send() sends a response of various types, while res.json() specifically sends a JSON response.

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Ques 7. What is Express Router?

Express Router is a middleware that can be used to define modular routes for your application.

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Ques 8. How to handle errors in Express.js?

You can handle errors in Express.js using middleware with four parameters (err, req, res, next) or using try-catch blocks.

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Ques 9. What is the purpose of body-parser middleware?

body-parser is used to parse the incoming request bodies in a middleware before the handlers, making it easier to handle form data and JSON payloads.

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Ques 10. Explain the concept of view engines in Express.js.

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

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