WebMD Node JS Developer Interview Questions, Process, and Tips

In memory database related question where I was asked to create class to satisfy test case written already, 4 level of question were there.

Q1. How does Nodejs differentiate and handle synchronous and asynchronous task
Ans. 
Node.js uses event-driven architecture to handle asynchronous tasks while synchronous tasks are executed in a blocking manner.
• Node.js uses event loop to handle asynchronous tasks by offloading them to the system, allowing other tasks to continue without waiting.

• Synchronous tasks are executed in a blocking manner, meaning the program waits for each task to complete before moving on to the next one.

• Node.js provides non-b...read more
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Q2. How do you deploy your application
Ans. 
I deploy my application using containerization and continuous integration/continuous deployment (CI/CD) pipelines.
• Utilize Docker to containerize the application for easy deployment and scalability

• Use CI/CD pipelines such as Jenkins or GitLab CI to automate the deployment process

• Deploy to cloud platforms like AWS, Azure, or Google Cloud for reliable hosting

• Implement monitoring and logging tools like Prometheus and ELK s
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Q3. How to implement caching using rabitmq
Ans. 
Caching can be implemented using RabbitMQ by storing frequently accessed data in memory.
• Set up a RabbitMQ server to act as a message broker

• Publish data to RabbitMQ when it is fetched from the database

• Subscribe to messages in your Node.js application and store the data in memory

• Check the cache before fetching data from the database
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Q1. How to make Nodejs handle multiple thread
Ans. 
Node.js is single-threaded, but can handle multiple threads using child processes or worker threads.
• Use child processes to run multiple instances of Node.js

• Use worker threads for CPU-intensive tasks

• Leverage the cluster module to create a pool of worker processes
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Q2. Fork vs spawn and when you used this
Ans. 
Fork creates a new process while spawn launches a new process asynchronously.
• Fork is used to create child processes in Node.js, typically for running separate instances of the same application.

• Spawn is used to launch a new process asynchronously, allowing for communication between the parent and child processes.

• Fork is commonly used in cluster mode for load balancing in Node.js applications.

• Spawn is used for executing
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Q3. Senerio based db question
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