Dimiour Node JS Developer Interview Questions and Answers

Q1. What is the reason data didnt reached backend
Ans. 
Possible reasons for data not reaching backend include network issues, incorrect API endpoints, server errors, and client-side validation errors.
• Network connectivity issues

• Incorrect API endpoints

• Server errors

• Client-side validation errors
Answered by AI
Add your answer
Q2. How to scale app for more users
Ans. 
To scale an app for more users, consider optimizing code, using caching, load balancing, and horizontal scaling.
• Optimize code for better performance

• Implement caching to reduce database load

• Use load balancing to distribute traffic evenly

• Consider horizontal scaling by adding more servers

• Use microservices architecture for better scalability
Answered by AI
Add your answer

Q1. All basic question related to node.js like event loop,
Add your answer
Q2. What is event loop?
Ans. 
Event loop is a mechanism in node.js that allows non-blocking I/O operations by handling asynchronous tasks efficiently.
• Event loop is responsible for handling asynchronous operations in node.js.

• It allows node.js to perform non-blocking I/O operations by delegating tasks to the operating system.

• Event loop continuously checks the event queue for new tasks and executes them in a loop.

• It helps in preventing the blocking of...read more
Answered by AI
Add your answer

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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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,
Answered by AI
Add your answer

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
Answered by AI
Add your answer

Q1. Wht do you know about your company
Ans. *Do a proper research about the company *Read online about the company's latest Abdates *understand it's business *role thoroughly the job description
Answered by Sobha Reddy
Add your answer
Q2. Why should we hear you?
Add your answer
Q3. With this tricky interview questions amd answer the employer wants to see your ability to pitch your skills and conversing power.
Add your answer

Q1. What are your strengths and weaknesses?
Add your answer
Q2. Tell me about self details
Ans. First i would like to for giving me this wonderful opportunity my self sobha i am from kadapa i have completed graduate in BSC biotechnology in vaishnavi degree college in rajampet. Percentage is 80%. I have 5 members are my family. I do have certificate in various department of clinical research amd clinical trials. My strength or quick Lerner dedicated towards assessment i have good exposure in clinical data mana
Answered by Sobha Reddy
Add your answer
Q3. What is Pharmacovilance
Add your answer
Q4. Pharmacoviglance is a science is related to detection assessment understanding prevention of adverse events.
Add your answer
Q5. What clinical research?
Ans. 
I'm sorry, but the question is not related to the job position of Node JS Developer.
• The question is not relevant to the job position.

• It is important to stay focused on the job requirements.

• If you are unsure about a question, it is okay to ask for clarification.
Answered by AI
Add your answer
Q6. Clinical research is a branch of health care science that determines the safety and effectiveness of medications devises diagnostic products treatment regiment intended from human use.
Add your answer

Q1. Covered all java concepts
Add your answer
Q2. Basics of spring boot
Add your answer

Q1. Stream based questions, sql queries to find correct output
Add your answer

Q1. Expected salary, basic hr questions, strength and weakness
Add your answer

5 questions ( 3 coding ).. and 2 objective MCQ

Q1. 2 or 3 coding questions based on conceptual only ( not need to write code )
Add your answer

Q1. Normal question like why do you want to join company and some other normal question that's it
Add your answer

Round duration - 90 minutes
Round difficulty - Medium

Timing -12pm to 1:30pm
Test environment was good and we should keep in our mind about our net speed.

Q1. 
Reverse Array Elements
Given an array containing 'N' elements, the task is to reverse the order of all array elements and display the reversed array.
Explanation:
The elements of the given array need to...read more
Ans. Brute Force approach
• Initialise start and end indices with start = 0, end = N-1 where N is the total number of elements in array.
• We then run a loop while start < end and swap arr[start] with arr[end].
• Finally, we increment start and decrement end variable
Space Complexity: O(1)Explanation: Time Complexity: O(1)Explanation:
Answered Anonymously
Add your answer
Q2. 
Tiling Problem Statement
Given a board with 2 rows and N columns, and an infinite supply of 2x1 tiles, determine the number of distinct ways to completely cover the board using these tiles.
You can place...read more
Ans. Recursion And Memoization (Runtime error)
Try to place the tile to fill the unit column and calculate the number of ways from smaller sub-problems. Then use memoization to convert O(2^N) solution to an O(N) solution.
1. At any point we are at ‘idx’ column then we can place our tile in two ways to fill this column.
   1. Option 1 -  1 Horizontal Tile
We can place in this way where we have ‘idx-1’ column filled.
    &nb...read more
Answered Anonymously
View 1 more answer

Round duration - 60 Minutes
Round difficulty - Easy

Timing was 3pm to 4 pm
environment was easy familier and interviwer was also in good mood ,first he ask me about general things then he come on OS/DBMS .

Round duration - 30 Minutes
Round difficulty - Easy

timing - 10am to 10:30am
environment was very familier and interviewer was with good sence of humor