The answer
Explain your User, Connection, and Message schemas, the references between them, the indexes for the queries you run, and your embed vs reference decisions. Show you designed for the queries, not just for storage.
Full Stack React Project Questions Asked in Interviews
How do I explain database schema design in an interview?
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Describe the frontend, backend, database, and how they connect: React calls Express REST APIs, Express uses Mongoose to talk to MongoDB, and Socket.IO for real-time chat. Show you understand how all the pieces fit together.
Explain JWT issuance on login, storage on the frontend, middleware on protected routes that verifies the token, and token refresh. Be ready to discuss trade-offs like accessToken vs httpOnly cookies for security.
Explain Socket.IO for live chat, how the connection is managed, how you clean up on unmount, and how you window long chat lists so they stay fast. Specifics show real implementation, not just concepts.
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