试图将图像上传到 nodejs api 但它 returns 出错

Question

我正在尝试将图片上传到我的 node.js 服务器，当我什么都不上传，只是将请求发送到 post 而没有图片时，它工作正常，但每当我尝试 post 图像 node.js 在控制台中显示错误

这里是 link 到 post “http://localhost:3001/databaseGym/logo” 这是我的代码来处理 post 对 link

的操作

 Router.post('/logo', upload.single('file'), (req, res) => {
    console.log("working");
    //res.json({ file: req.file });
    res.send("done");
  });

这是我在 upload.single()

中上传的代码

// Create storage engine
const storage = new GridFsStorage({
  url: url,
  file: (req, file) => {
    return new Promise((resolve, reject) => {
      crypto.randomBytes(16, (err, buf) => {
        if (err) {
          return reject(err);
        }
        const filename = buf.toString('hex') + path.extname(file.originalname);
        const fileInfo = {
          filename: filename,
          bucketName: 'logo'
        };
        resolve(fileInfo);
      });
    });
  }
});
const upload = multer({ storage });

这里是 postman 应用程序的屏幕截图，我通过它发送图像

这里是错误

MulterError: Unexpected field
    at wrappedFileFilter (D:\web dev\gym website\server_gym\node_modules\multer\index.js:40:19)
    at Busboy.<anonymous> (D:\web dev\gym website\server_gym\node_modules\multer\lib\make-middleware.js:114:7)
    at Busboy.emit (node:events:394:28)
    at Busboy.emit (D:\web dev\gym website\server_gym\node_modules\busboy\lib\main.js:38:33)
    at PartStream.<anonymous> (D:\web dev\gym website\server_gym\node_modules\busboy\lib\types\multipart.js:213:13)
    at PartStream.emit (node:events:394:28)
    at HeaderParser.<anonymous> (D:\web dev\gym website\server_gym\node_modules\dicer\lib\Dicer.js:51:16)
    at HeaderParser.emit (node:events:394:28)
    at HeaderParser._finish (D:\web dev\gym website\server_gym\node_modules\dicer\lib\HeaderParser.js:68:8)
    at SBMH.<anonymous> (D:\web dev\gym website\server_gym\node_modules\dicer\lib\HeaderParser.js:40:12)

Answer 1

您应该将 Postman 中的参数从 image 更改为 file，因为您在 POST 端点中指定了属性名称：

// you specify the `file` as the fieldname
Router.post('/logo', upload.single('file'), (req, res) => {
    console.log("working");
    //res.json({ file: req.file });
    res.send("done");
  });

来自文档：

.single(fieldname):

Accept a single file with the name fieldname. The single file will be stored in req.file.

试图将图像上传到 nodejs api 但它 returns 出错

trying to upload image to nodejs api but it returns with error

node.js

postman

multer

multer-gridfs-storage