Node.js Interview Questions Your Guide to Success
Node.js, a powerful JavaScript runtime, is crucial for building scalable server-side applications, making it an essential skill for backend developers and DevOps engineers. Jobpe offers a curated collection of Node.js interview questions, real-world scenarios, and expert guidance to help you excel in your next technical interview.
nodejs
- Backend
What is Node.js and how does it differ from traditional server-side platforms?
Node.js is a runtime environment that allows running JavaScript on the server. It uses an event-driven, non-blocking...
Explain the event loop in Node.js.
The event loop is a mechanism that handles asynchronous callbacks and allows Node.js to perform non-blocking operations.
What are streams in Node.js and why are they useful?
Streams are objects that let you read or write data piece-by-piece, which helps handle large data efficiently.
Describe how modules work in Node.js.
Modules encapsulate code and functionality. Node.js uses CommonJS modules where each file is treated as a module.
How do you handle errors in asynchronous Node.js code?
Errors in asynchronous code are handled using callbacks with error arguments, promises with catch blocks, or...
What is the purpose of the package.json file?
package.json manages project metadata and dependencies for Node.js applications.
Explain middleware in the context of Express.js.
Middleware functions process requests and responses in Express.js, enabling features like logging, authentication,...
What are buffers in Node.js?
Buffers handle raw binary data, allowing Node.js to interact with streams and perform I/O operations efficiently.
How can you improve performance in a Node.js application?
Performance can be improved by optimizing asynchronous operations, using clustering, caching, and minimizing blocking code.
What security best practices should be followed in Node.js apps?
Use input validation, sanitize data, manage dependencies carefully, and avoid exposing sensitive information.
Backend
What is Node.js and how does it differ from traditional server-side platforms?
Node.js is a runtime environment that allows running JavaScript on the server. It uses an event-driven, non-blocking I/O model making it lightweight and efficient.
Explain the event loop in Node.js.
The event loop is a mechanism that handles asynchronous callbacks and allows Node.js to perform non-blocking operations.
What are streams in Node.js and why are they useful?
Streams are objects that let you read or write data piece-by-piece, which helps handle large data efficiently.
Describe how modules work in Node.js.
Modules encapsulate code and functionality. Node.js uses CommonJS modules where each file is treated as a module.
How do you handle errors in asynchronous Node.js code?
Errors in asynchronous code are handled using callbacks with error arguments, promises with catch blocks, or async/await with try-catch.
What is the purpose of the package.json file?
package.json manages project metadata and dependencies for Node.js applications.
Explain middleware in the context of Express.js.
Middleware functions process requests and responses in Express.js, enabling features like logging, authentication, and routing.
What are buffers in Node.js?
Buffers handle raw binary data, allowing Node.js to interact with streams and perform I/O operations efficiently.
How can you improve performance in a Node.js application?
Performance can be improved by optimizing asynchronous operations, using clustering, caching, and minimizing blocking code.
What security best practices should be followed in Node.js apps?
Use input validation, sanitize data, manage dependencies carefully, and avoid exposing sensitive information.
