Node.js-使用multer上传文件，并使用Sendgrid

Question

const multer  = require('multer');
const storage = multer.memoryStorage();
const upload = multer({ storage: storage }).single('attachment');

// sgMail intialization

exports.sendMail = (req, res) => {
  upload(req, res, err => {
    if(!err) {
      const fileInfo = req.file;
      const msg = {
        to: 'toemail@gmail.com',
        from: 'fromemail@gmail.com',
        subject: 'Welcome!',
        html: `<p>Some text description</p>`,
        attachments: [
          {
            content: fileInfo.buffer.toString('base64'),
            filename: fileInfo.key,
            type: 'text/plain',
            disposition: 'attachment'
          },
        ],
      };
      sgMail.send(msg)
        .then(() => {
          res.json({data: 'success});
        })
        .catch((err) => {
          res.json({data: 'error'});
        });
     }
  });
}

错误：“ fileInfo”未定义，因此出现以下错误：

TypeError: Cannot read property 'buffer' of undefined

查询：

1. 未设置Content-Type标头。如果需要，值是多少？
2. multer实施有问题

Answer 1

const fileInfo = req.file;应该为const fileInfo = req.files;（复数）。

输出req.files的内容，因为您很可能必须以上传的数组索引或键名作为目标。