Multer req.file 未定义 - 使用 Node/Express 将图像上传到 s3

Question

我知道这个问题已经被问了很多，我已经尝试了几乎所有的答案来试图得到这个运行但我一直对 req.file.

未定义

代码如下：

services.imageUpload.js

const aws = require("aws-sdk");
const multer = require("multer");
const multerS3 = require("multer-s3");

aws.config.update({
  secretAccessKey: "XXXXXXXXXXXXX",
  accessKeyId: "XXXXXXXXXXXX",
  region: "XXXXXXX",
});
const s3 = new aws.S3();

const upload = multer({
  storage: multerS3({
    s3: s3,
    bucket: "XXXXXXXXX",
    metadata: function (req, file, cb) {
      cb(null, { fieldName: "TESTING_META_DATA" });
    },
    key: function (req, file, cb) {
      cb(null, req.s3key);
    },
  }),
});

module.exports = upload;

routes.imageUpload.js

const express = require("express");
const router = express.Router();
const upload = require("../services/imageUpload");

const singleUpload = upload.single("image");

router.post("/", function (req, res) {
  singleUpload(req, res, function (err) {
    return res.json({ request: req.file.location });
  });
});

module.exports = router;

index.js

const express = require("express");
const app = express();
const cors = require("cors");
const imageUpload = require("./routes/imageUpload");

//Middleware
app.use(cors());
app.use(express.json());

//Image upload
app.use("/upload-image", imageUpload);

app.listen(5000, () => {
    console.log("server is running on port 5000");
});

非常感谢您的帮助！相当令人沮丧。目前正在使用邮递员测试 API 并发送一个 POST 请求作为表单数据，键为“image”，值为上传的图像文件。

Answer 1

在你的index.js你可以带

const upload = require("../services/imageUpload");

在最上面，然后在这里初始化multer中间件

//Middleware
app.use(cors());
app.use(express.json());
app.use(upload.single("image"))

然后在routes.imageUpload.js你可以这样读取上传的文件

router.post("/", function (req, res) {
    let fileDetails = req.files
    console.log(fileDetails )
    .
    .
    .
});

或者如果您只需要 routes.imageUpload.js 中的上传器，您可以像这样使用中间件，

const express = require("express");
const router = express.Router();
const upload = require("../services/imageUpload");

const singleUpload = upload.single("image");

router.post("/",[singleUpload],function (req, res) {
    let fileDetails = req.files
    console.log(fileDetails )
    .
    .
    .
});

Multer req.file 未定义 - 使用 Node/Express 将图像上传到 s3

Multer req.file is undefined - using with Node/Express for image upload to s3

amazon-s3

node.js

express

multer

multer-s3