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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 1. What is Express.js?

Express.js is a web application framework for Node.js designed for building web applications and APIs.

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Ques 2. How to install Express.js?

You can install Express.js using npm (Node Package Manager) by running 'npm install express'.

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Ques 3. What is middleware in Express.js?

Middleware functions are functions that have access to the request, response, and the next function in the applicationâ€™s request-response cycle.

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Ques 4. Explain routing in Express.js.

Routing refers to how an applicationâ€™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 5. What is the purpose of app.use() in Express.js?

app.use() is used to mount middleware functions in the application. It is executed every time a request is received.

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