added Auth using mongo node and express [backend]

[Abhishek-TG18]

Pull Request Format

PR Title

Issue #1473 : Implement Authentication using MongoDB, Node.js, and Express.js [backend] solved

#

Type of PR

• Add X in the box to specify the improvement type.
• [] Bug fix
• [ x] Feature enhancement
• [ ] Documentation update
• [x ] BackendUpdate

Description

This pull request includes the implementation of the backend functionality for user authentication and management. The following features have been added:

• Signup: Users can register with their email and password. The server validates the input and stores the user information in the database.

• Sign-in: Registered users can log in by providing valid credentials.

• User Details: Once logged in, users can retrieve their account information from the database.

• Signout: Users can securely log out of their accounts.

All routes and logic have been implemented and tested with Postman. Please review and merge.

Checklist

• Add X in the box to specify.
• [X] I have performed a self-review of my code.
• x[ ] I have tested the changes thoroughly before submitting this pull request.
• [ ] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [x ] I have commented my code, particularly in hard-to-understand areas.

Information to Start the server

Feel free to ask if you have any doubt

I have tested the code using Postman API Testing here are the demo videos

https://github.com/user-attachments/assets/c75322b0-5d83-4ef3-a0ae-f4503dba8463

https://github.com/user-attachments/assets/5ed926a1-cec8-4e9c-a51f-f261a32561d3

https://github.com/user-attachments/assets/f4ab790a-96e7-4170-ba99-3d0dc16c24e5

https://github.com/user-attachments/assets/7b222d0a-aaa9-4865-90aa-c9840385a194

Thank you for reviewing my pull request!

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