Next.js Realtime Handbook FAQs

Question 1

Should real-time connection handlers run on Node.js or Edge runtimes?

Accepted Answer

Standard Node.js runtimes are strongly preferred for long-lived persistent connections. Edge runtimes typically enforce strict execution time limits and are poorly suited for connection fan-out or persistent state.

Question 2

How does this skill handle WebSocket authentication in Next.js?

Accepted Answer

Since browser WebSocket APIs do not reliably send custom headers or cookies on cross-origin handshakes, the handbook advocates minting a short-lived ticket via an authenticated HTTP Route Handler before initiating the socket connection.

Question 3

How does the skill address scaling real-time connections across multiple servers?

Accepted Answer

The handbook outlines horizontal scaling architectures using shared pub/sub layers like Redis or message brokers to ensure events are properly fanned out across all instances to reach connected clients.

Question 4

When should I choose Server-Sent Events (SSE) over WebSockets in Next.js?

Accepted Answer

Use SSE when you only need unidirectional server-to-client updates such as notifications, live log streams, and status indicators. Choose WebSockets when your feature demands low-latency, bidirectional message exchange such as collaborative whiteboards or interactive chat.

Next.js Realtime Handbook

Key Features

Use Cases

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