How to pass multipart request from one server to another in NodeJS? - node.js

Question

I have two nodeJS servers,
Server 1 gets requests from the client and passes it to server 2 which returns a response to server 1 and it responds to the client.
The client uploads a file and it has to be passed the same way as any other rest request that I have.
I use axios on server 1 to send the data to server2 and multer on server 2 to store the file on disk.
I have an issue sending the request from server1 to server2 because the body of the request contains nothing and the request is Multipart.
How should I handle the request on Server 1 ???
router.post('/fileUpload', (req, res) => {
console.log(req.body);
res.status(200).json({ msg: "Got file" });
});

Answer 1

You can use form-data module to send multipart/form-data from nodejs application
Here is the code you can implement on Server1 to receive image file from client and send it to Server2.
const express = require("express");
const app = express();
const bodyParser = require('body-parser');
var multer = require('multer')();
const FormData = require('form-data');
const axios = require('axios');
const fs = require('fs');
app.use(bodyParser.json());
app.post('/fileUpload' , multer.single('fileFieldName'), (req , res) => {
const fileRecievedFromClient = req.file; //File Object sent in 'fileFieldName' field in multipart/form-data
console.log(req.file)
let form = new FormData();
form.append('fileFieldName', fileRecievedFromClient.buffer, fileRecievedFromClient.originalname);
axios.post('http://server2url/fileUploadToServer2', form, {
headers: {
'Content-Type': `multipart/form-data; boundary=${form._boundary}`
}
}).then((responseFromServer2) => {
res.send("SUCCESS")
}).catch((err) => {
res.send("ERROR")
})
})
const server = app.listen(3000, function () {
console.log('Server listening on port 3000');
});
Here multer is used to handle the uploaded file

Answer 2

const formData = new FormData();
formData.append('query', updateDocQuery);
formData.append('variables', JSON.stringify(this.setUpdateDocParams() || {}));
for (let i = 0; i < fileArr.length; i++) {
formData.append(`file${i}`, fileArr[i])
}
you can append your query variables and file to formData and pass formData to body