32 lines
877 B
Markdown
32 lines
877 B
Markdown
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# 后端服务
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Node.js + Express + TypeScript + Mongoose + OpenAI 示例。
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## 环境变量
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复制 `.env.example` 为 `.env` 并填写:
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```
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PORT=3000
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MONGODB_URI=mongodb://localhost:27017/multi_llm_chat
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OPENAI_API_KEY=sk-...
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# 可选 OpenAI base (代理): OPENAI_BASE_URL=https://api.openai.com
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DEEPSEEK_API_KEY=sk-deepseek...
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DEEPSEEK_BASE_URL=https://api.deepseek.com
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```
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## 运行
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```bash
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npm install
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npm run dev
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```
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## 接口
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- POST /api/chat { modelId, messages } => { text }
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- POST /api/chat/stream (SSE) data: <chunk> 直到 data: [DONE]
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- POST /api/conversations 保存对话
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- GET /api/conversations/:id 读取对话
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- GET /api/health 健康检查
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## 说明
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已接入 OpenAI 与 DeepSeek（DeepSeek 通过 model 名包含 "deepseek" 自动匹配，使用 OpenAI 协议 /v1/chat/completions）。可继续在 `llmService.ts` 中扩展更多 provider 逻辑。
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