EasyHai Online Backend Developer Interview Questions and Answers

Make a CRUD app using Node.js with MongoDB

Q1. What is REPL in Node.js
Ans. 
REPL stands for Read-Eval-Print Loop. It is an interactive programming environment in Node.js.
• REPL allows you to enter commands and immediately see the results.

• It is useful for testing code snippets, debugging, and exploring Node.js features.

• You can access the REPL by running the 'node' command in the terminal.

• Commands like .help, .break, .clear, and .exit are available in the REPL.

• Example: Entering '2 + 2' in the REPL
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Q2. What is JWT and its use?
Ans. 
JWT stands for JSON Web Token. It is a compact, URL-safe means of representing claims between two parties.
• JWT is commonly used for authentication and authorization purposes in web applications.

• It is a self-contained token that contains information about the user and their permissions.

• JWTs are digitally signed, ensuring their integrity and authenticity.

• The token can be easily decoded and verified by the server without t...read more
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Q3. Difference between git and github?
Ans. 
Git is a version control system that allows tracking changes in files, while GitHub is a web-based platform for hosting Git repositories.
• Git is a distributed version control system that allows multiple developers to collaborate on a project.

• GitHub is a web-based platform that provides hosting for Git repositories and offers additional features like issue tracking and pull requests.

• Git is primarily used for local develo...read more
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