Cannot send form data as 'Multipart/formdata' - node.js

Question

Cannot send form data as 'Multipart/formdata' Content type in react-native expo app.
when we send formData object in post request in react -native app, we cant get req.body of req.files from node backend
export const saveUserAddVisitor = async data => {
try {
const apiUrl = configConstants.apiUrlWithPort;
const addVisitorData = await axios.post(
`${apiUrl}/api/v1/mobile/apartment/member`,
data,
{
headers: {
Accept: 'application/json',
'Content-Type': 'multipart/form-data',
},
},
);
return addVisitorData;
} catch (err) {
return err;
}
};

Answer 1

You can try something like this which works without Axios:
export const saveUserAddVisitor = async data => {
var data = new FormData()
data.append('foo', {
...
})
try {
const apiUrl = configConstants.apiUrlWithPort;
const addVisitorData = await fetch(`${apiUrl}/api/v1/mobile/apartment/member`, {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'multipart/form-data'
},
body: data
})
return addVisitorData;
} catch {
return err;
}
}
After I gave you an example of working code for the client, but the problem may be from the server ;)

Answer 2

Your code with axios look like fine, just be sure to send FormData type, like Rémi said here https://stackoverflow.com/a/72454168/16205278
You can construct your FormData before this function and use it directly in your current code with your axios function.
Service :
import axios from "axios";
import configConstants from "./config.js";
/**
* Current function to save User Add Visitor
* #param {*} data
*/
export const saveUserAddVisitor = async (data) => {
try {
const apiUrl = configConstants.apiUrlWithPort;
const addVisitorData = await axios.post(
`${apiUrl}/api/v1/mobile/apartment/member`,
data,
{
headers: {
Accept: 'application/json',
"Content-Type": "multipart/form-data"
}
}
);
return addVisitorData;
} catch (err) {
return err;
}
};
Use :
import {saveUserAddVisitor} from "./index"
const form = new FormData();
form.append("visitor", { firstName: "Jack", lastName: "Doe" });
saveUserAddVisitor(form);
API Express :
Apparently, express can't resolve multipart-form data unless some help, according following ressource : https://codex.so/handling-any-post-data-in-express
You have to use multer middleware :
const multer = require('multer');
app.post('/', multer().none(), function (req, res, next) {
req.body;
//... some code
});