How to Build Backend For a Real-time Chat Application Assignment

Assignment Task

Objective

Develop a comprehensive backend for a real-time chat application using the MERN stack, emphasizing the use of Node.js and MongoDB for server-side logic and database management. This assignment is designed to test your ability to manage real-time data exchange, database schema design, user authentication, and server-side logic, including integration with third-party APIs for language processing.

Requirements

1. User Authentication:

• Implement a registration and login system.
• Users should sign up with an email and password.
• Use JWT (JSON Web Tokens) for managing authentication.

2. Chat Functionality:

• Users should be able to send and receive real-time messages.
• Utilise Socket.io for efficient real-time communication.

3. Message Storage:

• Store all messages in MongoDB.
• Ensure messages in chat are retrievable for conversation between people.

4. User Online Status and LLM Integration (IMPORTANT):

• A user can set their status as ‘AVAILABLE’ or ‘BUSY’
• Users can chat if they are online. If the recipient is ‘BUSY’, automatically generate an appropriate response using a language model API such as ChatGPT, Claude, Gemini or any free API available. (In case any API is not available/accessible to you, use the function at the end of assignment to mock the API response. Preferred to have an actual API functioning).
• API Response from the LLM should be sent within 10 seconds. If the LLM API does not respond in 10 seconds, send a standard message indicating the user is unavailable. (IMPORTANT)

5. Basic Frontend (Optional)

• Provide a simple frontend to demonstrate the backend functionalities.
• This is primarily for testing and demonstration purposes.

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