WITS Innovation Lab Node JS Developer Interview Questions and Answers

Q1. Javascript simple questions
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Q2. What are Promise
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Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained together using .then() method.

• They help in avoiding callback hell and writing cleaner asynchronous code.
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Q1. What is Prototype
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Prototype is an object that is associated with every functions and objects by default in JavaScript.
• Prototype is used to add new properties or methods to existing objects or functions.

• It allows objects to inherit properties and methods from other objects.

• Changing the prototype of an object affects all instances of that object.
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Q2. What's middle ware
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Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and interact with each other.
• Middleware is used to handle tasks such as authentication, logging, error handling, and more in web applications.

• It can modify incoming requests, outgoing responses, or both.

• Examples of middleware in Node.js include Express.js middleware like body-parser and morgan.
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