Why is the JWT cookie not being set in the browser?
Ensure the frontend uses withCredentials: true in Axios, the backend sets credentials: true in CORS, and cookie options include httpOnly: true, sameSite: 'lax', and secure: true only in production (HTTPS). sameSite: 'none' requires secure: true.
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More FAQs in DevTinder Common Bugs and Solutions Debugging Guide for Node.js Projects
Check if MongoDB is running (mongosh for local), verify the MONGODB_URI in .env, ensure Atlas IP whitelist includes your IP, and check that the database name is in the connection string.
Configure CORS on the backend Socket.io server with the frontend origin and credentials: true. On the frontend, use withCredentials: true and pass the token in auth. In production, configure Nginx with Upgrade and Connection headers for WebSocket support.
In the global error handler, check if err.code === 11000. Extract the field name from err.keyPattern and return a 409 Conflict status with a descriptive message like 'Duplicate value for email'.
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