multer 中间件无法识别请求体

Question

const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, "public/images");
  },
  filename: (req, file, cb) => {
    console.log(req.body); // <- This will output null object
    cb(null, file.originalname);
  },
});

const upload = multer({ storage });
app.post("/api/upload", upload.single("file"), (req, res) => {
  try {
    return res.status(200).json(req.body);
  } catch (err) {
    console.log(err);
  }
});

邮递员要求：

控制台输出：

>>>>>>>>>>>>>SERVER STARTED<<<<<<<<<<<<<
(node:3741192) [MONGODB DRIVER] Warning: Top-level use of w, wtimeout, j, and fsync is deprecated. Use writeConcern instead.
(node:3741192) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
Connected to MongoDB
[Object: null prototype] {}
::1 - - [08/Jun/2021:12:11:21 +0000] "POST /api/upload HTTP/1.1" 200 23

我的问题是：

  filename: (req, file, cb) => {
    console.log(req.body); // <- This will output null object
    cb(null, file.originalname);
  },

req.body 是一个空对象。但它不应该？在邮递员请求中，我包含了一个 name 属性.

Answer 1

来自multer documentation：

Note that req.body might not have been fully populated yet. It depends on the order that the client transmits fields and files to the server.

因此，更改邮递员表格中的顺序并将 name 放在 file 之前（您可以简单地 drag/drop 该行）将解决问题。

multer 中间件无法识别请求体

multer middleware does not recognize body of req

javascript

file-upload

node.js

multer