Express.js部署至Vercel后CORS跨域请求失败问题求助

阿华AIGC实验室

2026-4-14

各位大佬好！我最近把自己的Express后端部署到Vercel之后，本地前端（地址是http://localhost:5173）完全没法获取后端数据，一直弹出CORS相关的报错，试了一些方法都没解决，来请教大家！

遇到的具体错误

第一个请求/reviews的报错：

Access to XMLHttpRequest at 'https://richter-restaurant-server-alzami12-al-zamis-projects.vercel.app/reviews' from origin 'http://localhost:5173' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

第二个请求/jwt的报错（预检请求失败）：

Access to XMLHttpRequest at 'https://richter-restaurant-server-alzami12-al-zamis-projects.vercel.app/jwt' from origin 'http://localhost:5173' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

我当前的CORS配置代码

我在Express里是这么配置CORS的：

app.use(cors({
    origin: 'http://localhost:5173'
}));

项目的依赖版本

这是我package.json里的依赖部分：

"dependencies": {
    "@stripe/agent-toolkit": "^0.2.0",
    "cors": "^2.8.5",
    "dotenv": "^16.4.7",
    "express": "^4.21.2",
    "firebase-admin": "^13.0.1",
    "form-data": "^4.0.1",
    "jsonwebtoken": "^9.0.2",
    "mailgun.js": "^10.2.4",
    "mongodb": "^6.12.0",
    "nodemailer": "^6.9.16",
    "stripe": "^17.5.0",
    "uuid": "^11.0.3"
  }