Appgenix Infotech LLP Mern Stack Developer Interview Questions and Answers

Q1. What is difference between useState and useRef
Ans. 
useState is used to manage state in functional components, while useRef is used to persist values between renders.
• useState is used for managing state in functional components and triggers re-renders when the state changes.

• useRef is used to persist values between renders without triggering re-renders.

• useState returns a tuple with the current state value and a function to update it, while useRef returns a mutable ref obj...read more
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Q2. What is jwt token and difference between jwt token and bearer token
Ans. 
JWT token is a JSON web token used for authentication and authorization. Bearer token is a type of access token that is used to authenticate API requests.
• JWT token stands for JSON Web Token and is used for securely transmitting information between parties as a JSON object.

• Bearer token is a type of access token that is used to authenticate API requests.

• JWT token is self-contained and contains user information and metada...read more
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Creat a role base management for the admin and student where student will perfrom the mcq test and admin can create a mcq and get the details of student