如何修复“MulterError:意外字段"在 nodejs 快递服务器中? [英] How to fix "MulterError: Unexpected field" in a nodejs express server?

问题描述

我正在设置服务器以从客户端上传 zip 文件.服务器使用 express 和 multer 来执行此操作.上传文件时，服务器抛出MulterError: Unexpected field"错误，我无法弄清楚它是什么.

I'm setting up a server to upload zip files from the client. The server runs with express and multer to do this. When uploading a file, the server throws a "MulterError: Unexpected field" error and I cannot figuere out what is cousing it.

我尝试过使用 png 图像，效果很好.但是使用 zip 文件就行不通了.

I've tried with png images and It works just fine. But with the zip files it just doesn't work.

const multerConfig = {
    //specify diskStorage (another option is memory)
    storage: multer.diskStorage({
      //specify destination
      destination: function(req, file, next){
        next(null, './public/zip-storage');
      },

      //specify the filename to be unique
      filename: function(req, file, next){
        console.log(file);
        const ext = file.mimetype.split('/')[1];
        //set the file fieldname to a unique name containing the original name, current datetime and the extension.
        next(null, file.fieldname + '-' + Date.now() + '.'+ext);
      }
    }),

    // filter out and prevent non-image files.
    fileFilter: function(req, file, next){
          if(!file){
            next();
          }
        // only permit zip mimetypes
        const zip = file.mimetype.startsWith('application');
        if(zip){
          console.log('zip uploaded');
          next(null, true);
        }else{
          console.log("file not supported")
          errorReq = true;
          return next();
        }
    }
  };


  /* ROUTES
  **********/
  app.get('/', function(req, res){
    res.render('index.html');
  });

  var errorDetection = function(){
    if(!errorReq){
      errorReq = false;
      return('complete.html');
    } else{
      errorReq = false;
      return('errorupload.html');
    }
  }

  app.post('/upload', multer(multerConfig).single('photo'),function(req, res){
      //Here is where I could add functions to then get the url of the new photo
      //And relocate that to a cloud storage solution with a callback containing its new url
      //then ideally loading that into your database solution.   Use case - user uploading an avatar...
      res.redirect('complete.html');
  }

);

  // RUN SERVER
  app.listen(port,function(){
    console.log(`Server listening on port ${port}`);
  });

这是错误:

MulterError: Unexpected field
    at wrappedFileFilter (/home/axentiva-miguel/Documentos/ServerAPP/node_modules/multer/index.js:40:19)
    at Busboy.<anonymous> (/home/axentiva-miguel/Documentos/ServerAPP/node_modules/multer/lib/make-middleware.js:114:7)
    at emitMany (events.js:147:13)
    at Busboy.emit (events.js:224:7)
    at Busboy.emit (/home/axentiva-miguel/Documentos/ServerAPP/node_modules/busboy/lib/main.js:38:33)
    at PartStream.<anonymous> (/home/axentiva-miguel/Documentos/ServerAPP/node_modules/busboy/lib/types/multipart.js:213:13)
    at emitOne (events.js:116:13)
    at PartStream.emit (events.js:211:7)
    at HeaderParser.<anonymous> (/home/axentiva-miguel/Documentos/ServerAPP/node_modules/dicer/lib/Dicer.js:51:16)
    at emitOne (events.js:116:13)

推荐答案

在代码中

app.post('/upload', multer(multerConfig).single('photo'),function(req, res){
      //Here is where I could add functions to then get the URL of the new photo
      //And relocate that to a cloud storage solution with a callback containing its new URL
      //then ideally loading that into your database solution.   Use case - user uploading an avatar...
      res.redirect('complete.html');
  }

我将值设为 single('photo')，当在我发送的 HTML 表单中时，其中包含一个 'zip' 值.更改使代码按预期工作:)

I was putting the value single('photo'), when in the HTML form I sent, a 'zip' value in there. Changing that made the code work as expected :)

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