Senior Backend (Nodejs ) Interview Questions #codinginterview #javascript #nodejs

Senior Backend Developer (Node.js) Interview Questions, organized by topic

Core Node.js Concepts

Explain the Node.js event loop and how it works.

What is the difference between process.nextTick(), setImmediate(), and setTimeout()?

How does Node.js handle asynchronous operations?

What is the role of the libuv library in Node.js?

Explain the difference between CommonJS and ES Modules in Node.js.

What is clustering in Node.js and when should you use it?

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API Design & RESTful Services

How do you design scalable RESTful APIs?

What are the key principles of REST architecture?

How do you handle API versioning?

How would you implement rate limiting in an API?

Explain the importance of idempotency in HTTP methods.

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Authentication & Security

How do you implement authentication and authorization in Node.js?

What is the difference between JWT and session-based authentication?

How do you protect Node.js apps from common security threats (e.g., XSS, CSRF, SQL injection)?

What is helmet.js and how does it improve security?

How do you securely store and manage API keys and secrets?

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