Build chatbots in Next.js

// app/api/chat/route.ts — runs on the server only
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.SOMNUS_API_KEY,
  baseURL: "https://gateway-production-c837.up.railway.app/v1",
});

export async function POST(req: Request) {
  const { message } = await req.json();
  const stream = await client.chat.completions.create({
    model: "claude-sonnet-5",
    messages: [{ role: "user", content: message }],
    stream: true,
  });
  const encoder = new TextEncoder();
  return new Response(new ReadableStream({
    async start(controller) {
      for await (const chunk of stream) {
        controller.enqueue(encoder.encode(chunk.choices[0]?.delta?.content ?? ""));
      }
      controller.close();
    },
  }));
}