发出发布请求时发生意外的字段错误？

Question

我发出发布请求时遇到意外的字段错误？这是我的节点js代码

var express = require('express');
var multer = require('multer');
var bodyParser = require('body-parser');
var cors = require('cors');
var app = express();
var PORT = process.env.PORT || 3000;
var upload = multer({ dest: 'uploads/' })


// use of body parser
app.use(bodyParser.urlencoded({
    extended: true
}));

app.use(bodyParser.json());
app.use(cors());




app.post('/upload',upload.single('avatar'), function (req, res,next) {
console.log(req.file);
console.log('hello');
res.send({data:'sss'})
});


app.listen(PORT, () => {
    console.log(`App is listening to ${PORT}`);
})

我正在使用此插件上传文件https://www.npmjs.com/package/multer 当我通过postman访问服务时，我遇到了错误

**App is listening to 3000
Error: Unexpected field
    at makeError (C:\Users\B0207296\WebstormProjects\uploadFile\node_modules\multer\lib\make-error.js:12:13)
    at wrappedFileFilter (C:\Users\B0207296\WebstormProjects\uploadFile\node_modules\multer\index.js:40:19)
    at Busboy.<anonymous> (C:\Users\B0207296\WebstormProjects\uploadFile\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 (C:\Users\B0207296\WebstormProjects\uploadFile\node_modules\busboy\lib\main.js:38:33)
    at PartStream.<anonymous> (C:\Users\B0207296\WebstormProjects\uploadFile\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> (C:\Users\B0207296\WebstormProjects\uploadFile\node_modules\dicer\lib\Dicer.js:51:16)**

邮递员图片

Answer 1

在PostMan中，将密钥重命名为avatar

编辑： multer期望上载文件的name是avatar，而不是file_test

Answer 2

我的问题是 roter 文件中的一个错误。

我有：

router.post(
   "/addArticle",
   upload.single("image"),
   upload.array("rowPics"),
   (req, res, next)=>{...some code}
)

我的目标是上传一个名为 image 的文件和多个文件作为一个名为 rowPics 的数组。但不能同时使用 upload.single 和 upload.array。为了上传具有不同名称的多个文件，我不得不像下面这样更改我的代码：

router.post(
   "/addArticle", 
   upload.fields([
      {name: "image", maxCount: 1},
      {name: "rowPics"}
   ]),
   (req, res, next)=>{...some code}
)

在 ...some code 部分，我解析了如下输入：

let image = req.files.image[0].path
let rowPics = req.files.rowPics.map(el=>el.path)

问题解决了。