Birlasoft Node Js Backend Developer Interview Questions, Process, and Tips

Q1. What is NodeJs and why we need to use
Ans. 
Node.js is a runtime environment that allows you to run JavaScript on the server side.
• Node.js is built on Chrome's V8 JavaScript engine.

• It is lightweight and efficient for building scalable network applications.

• Node.js uses an event-driven, non-blocking I/O model, making it ideal for real-time applications like chat apps or streaming services.
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Q2. NodeJs is single threaded but how it achieved multiple threading
Ans. 
NodeJs achieves multiple threading through event loop and asynchronous non-blocking I/O operations.
• NodeJs uses event loop to handle multiple requests efficiently without blocking the main thread.

• It utilizes asynchronous non-blocking I/O operations to perform tasks concurrently.

• NodeJs can also create child processes to handle heavy computational tasks in parallel.
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It was related to Basic HTML and Node. Some questions are from regioning.

Q1. Given three tables Employee (Which contains employees' IDS and name), Project(Which contains IDs and name), and allocation (Which contains links employee to project via their IDs).Write a query to return a...read more
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It was for 30mins and expected to use Java 8 inbuilt functions

Q1. Find pairs from list whose is equals to target
Ans. 
Find pairs from list whose sum is equal to target
• Iterate through the list and for each element, check if the target minus the element exists in a hashmap

• If it exists, add the pair to the result list

• If it doesn't exist, add the current element to the hashmap
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Q2. Multiple iNheritance
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DSA - STRING AND ARRAY QUESTION

Q1. Why should we hire you. ?
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Q2. Why you want this job.?
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Q1. What is nodejs, explain the event loop.
Ans. 
Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows developers to run JavaScript on the server-side.
• Node.js is event-driven and non-blocking I/O model.

• It uses an event loop to handle asynchronous operations.

• The event loop is a continuously running process that waits for events and executes callbacks.

• Callbacks are functions that are called when an event occurs, such as a request completing ...read more
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Q2. What is event loop ?
Ans. 
Event loop is a mechanism that allows Node.js to perform non-blocking I/O operations.
• Event loop is a single-threaded loop that constantly checks for new events in the event queue.

• It executes the callback functions associated with the events in the queue.

• It allows Node.js to handle multiple requests simultaneously without blocking the execution of other requests.

• It is responsible for managing the order of execution of t...read more
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Q3. What is the role of libuv ?
Ans. 
libuv is a multi-platform support library with a focus on asynchronous I/O.
• libuv provides event loop, thread pool, timer, and file system APIs.

• It is used by Node.js to handle I/O operations in a non-blocking way.

• libuv abstracts the differences between operating systems and provides a consistent API.

• It also supports network programming and inter-process communication.

• Examples of libuv-based applications include Node.js,
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Q1. What is the difference between cluster and thread ?
Ans. 
Cluster is a group of processes that share the same resources while thread is a lightweight process that shares the same memory.
• Cluster is used for scaling and load balancing while thread is used for improving performance.

• Cluster can run on multiple machines while thread runs within a single process.

• Cluster requires inter-process communication while thread does not.

• Examples of cluster include PM2 and Node.js cluster mo...read more
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