Advanced Node Js Interview Questions

Advanced Node Js Interview Questions

Challenging Node.js Interview Questions for Experienced Developers

Advanced Node Js Interview Questions

Advanced Node.js interview questions assess candidates' in-depth understanding of the platform's advanced features and concepts. These questions delve into topics such as microservices architecture, cluster management, performance optimization, and security best practices. By evaluating candidates' knowledge in these areas, interviewers can identify individuals with the expertise to build and maintain scalable, robust, and secure Node.js applications in complex and demanding environments.

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1 - Explain event loop and how it works in Node.js.

     Node.js uses an event loop to handle asynchronous operations. When an asynchronous operation is triggered, it is added to a queue. The event loop then checks the queue and executes the next operation in line.

2) Describe how to handle errors in Node.js.

     Errors in Node.js can be handled using the `try…catch` statement. The `try` block contains the code that may throw an error, and the `catch` block contains the code that will handle the error.

3) Explain how to create a custom module in Node.js.

     Custom modules can be created in Node.js using the `module.exports` object. The `module.exports` object contains the functions and variables that will be exported from the module.

4) Describe how to use streams in Node.js.

     Streams are used in Node.js to handle large amounts of data efficiently. Streams can be used to read data from files, databases, or other sources.

5) Explain how to use child processes in Node.js.

     Child processes can be used in Node.js to execute other programs. Child processes can be used to run long running tasks or to communicate with other processes.

6) Describe how to use the Node.js debugger.

     The Node.js debugger can be used to debug JavaScript code. The debugger can be accessed using the `debugger` keyword or by attaching a debugger to the Node.js process.

7) Explain how to use web sockets in Node.js.

     WebSockets are used in Node.js to establish real time connections between clients and servers. WebSockets can be used to send and receive data between clients and servers in real time.

8) Describe how to use the Node.js REPL.

     The Node.js REPL (Read Eval Print Loop) is an interactive shell that can be used to execute JavaScript code. The REPL can be accessed by running the `node` command without any arguments.

9) Explain how to use the Node.js profiler.

     The Node.js profiler can be used to profile the performance of JavaScript code. The profiler can be used to identify bottlenecks in code and to improve performance.

10) Describe how to use the Node.js cluster module.

     The Node.js cluster module can be used to create a cluster of workers that can handle multiple requests simultaneously. The cluster module can be used to improve the performance of Node.js applications by distributing requests across multiple workers.

11 - Explain how to use the Node.js HTTP/2 module.

     The Node.js HTTP/2 module can be used to create HTTP/2 servers and clients. HTTP/2 is a newer version of HTTP that offers improved performance and features.

12) Describe how to use the Node.js TLS/SSL module.

     The Node.js TLS/SSL module can be used to create TLS/SSL servers and clients. TLS/SSL is used to secure communications between clients and servers.

13) Explain how to use the Node.js zlib module.

     The Node.js zlib module can be used to compress and decompress data. The zlib module can be used to improve the performance of Node.js applications by reducing the size of data that is transmitted over the network.

14) Describe how to use the Node.js crypto module.

     The Node.js crypto module can be used to perform cryptographic operations. The crypto module can be used to encrypt and decrypt data, generate hashes, and sign and verify digital signatures.

15) Explain how to use the Node.js fs module.

     The Node.js fs module can be used to interact with the file system. The fs module can be used to read, write, and delete files and directories.

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Node Js Interview Questions And Answer