nodejs upload files to s2 aws amazon - node.js

Question

This is my current code. It does not work.
I post the image in form data.
My Questions are:
How can i see the form data in node.js (try log req.body and it is an empty object)
What does the "demo.jpg" in the code mean?
NODEJS
var aws = require('aws-sdk');
const express = require('express');
const router = express.Router();
aws.config.update({
"accessKeyId": "<MY_KEY>",
"secretAccessKey": "<MY_SECRET>"
});
router.post('/', (req, res, next) => {
console.log(res.body)
var s3 = new aws.S3();
var params = {
Bucket: "passwordapp",
Key: 'aaaaaa',
Expires: 60,
ContentType: 'jpg'
};
s3.getSignedUrl('demo.jpg', params, function(err, data) {
//console.log("err",err);
if (err) {
res.json(err)
} else {
res.json(data)
}
});
});
module.exports = router;

Answer 1

Ok got the solution from here:
https://stackoverflow.com/a/54402849/1230198
use multer
this is my WORKING code:
const express = require('express');
const router = express.Router();
const AWS = require('aws-sdk');
const multer = require('multer');
const storage = multer.memoryStorage()
const upload = multer({storage: storage});
const s3Client = new AWS.S3({
"accessKeyId": "<KEY>",
"secretAccessKey": "<SECRET>"
});
const uploadParams = {
Bucket: 'passwordapp',
Key: '', // pass key
Body: null, // pass file body
};
router.post('/', upload.single("image"),(req, res, next) => {
const params = uploadParams;
uploadParams.Key = req.file.originalname;
uploadParams.Body = req.file.buffer;
s3Client.upload(params, (err, data) => {
if (err) {
res.status(500).json({error:"Error -> " + err});
}
res.json({message: 'File uploaded successfully','filename':
req.file.originalname, 'location': data.Location});
});
});
module.exports = router;