Ecosmob Technologies Junior Software Developer Interview Questions, Process, and Tips

JWT tokens are used for authentication and authorization in ReactJS applications.

• JWT stands for JSON Web Token

• Tokens are generated on the server and sent to the client

• Tokens contain encoded information about the user and their permissions

• Tokens are stored in local storage or cookies

• Tokens are sent with each request to the server for authentication and authorization

Redux is a state management library for JavaScript applications.

• Redux helps manage the state of an application in a predictable way

• It provides a central store for all the application's state

• Actions are dispatched to update the store, and components can subscribe to changes in the store

• Redux can be used with React, Angular, and other JavaScript frameworks

Lookup in MongoDB is used to perform a join between two collections.

• Lookup is used to combine data from multiple collections in a single query.

• It is similar to a SQL join operation.

• Lookup requires a local field in the input collection and a foreign field in the from collection.

• Example: db.orders.aggregate([{ $lookup: { from: 'products', localField: 'productId', foreignField: '_id', as: 'productDetails' } }])

Docker is a platform that allows you to package, distribute, and run applications in isolated containers.

• Docker containers are lightweight, portable, and self-sufficient environments that include everything needed to run an application.

• Docker uses containerization technology to create and manage containers, which can be easily deployed across different environments.

• Docker simplifies the process of building, shipping, a...read more

Yes, I have deployed multiple applications in AWS.

• Deployed a web application using AWS Elastic Beanstalk

• Utilized AWS Lambda for serverless application deployment

• Managed databases using Amazon RDS

• Implemented CI/CD pipelines with AWS CodePipeline

Event loop is a mechanism that allows for asynchronous programming by handling and executing events in a loop.

• Event loop is a part of the runtime environment in JavaScript.

• It manages the execution of multiple tasks by putting them in a queue and processing them one by one.

• Event loop allows for non-blocking I/O operations, making the code more efficient and responsive.

• Example: setTimeout() function in JavaScript uses th...read more