How do I implement SSE for streaming AI chat messages like ChatGPT in Next.js?

Use a Route Handler with ReadableStream: enqueue JSON-wrapped tokens via TextEncoder, set text/event-stream header. Client uses EventSource to listen.

What's the difference between SSE and WebSockets for AI streaming?

SSE is unidirectional HTTP (perfect for server-push), scales easily without sticky sessions. WebSockets bidirectional but complicates auth, scaling.

Can SSE stream responses from real models like GPT-4?

Absolutely—proxy OpenAI's streaming endpoint through your SSE handler, transforming chunks on-the-fly for custom UIs.

🗄️ Databases & Backend

Unlock ChatGPT-Style Streaming: SSE Magic in Next.js

Picture this: your prompt hits the AI, and words flood in, alive, token by token. That's the streaming sorcery of ChatGPT—now yours to wield with SSE in Next.js.

DevTools Feed Apr 03, 2026 4 min read 11 views

Real-time AI chat interface streaming responses token-by-token in a Next.js app, mimicking ChatGPT

⚡ Key Takeaways

SSE enables ChatGPT-like streaming via simple HTTP chunked encoding—no WebSockets needed. 𝕏
Next.js Route Handlers make implementation a breeze with ReadableStream. 𝕏
Scales effortlessly, powers the future of live AI interfaces like collaborative agents. 𝕏

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#AI chat streaming #AI streaming #ChatGPT #Next.js #Next.js API routes #SSE #SSE streaming #Server-Sent Events

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