In an Expo app, when you send a FormData object to the server, the server might receive it as _parts if the server is parsing the incoming request data using a specific library or middleware. The _parts field usually contains an array of key-value pairs representing the form data.

When you use FormData in an Expo app, it's a common practice to send the data using the fetch API or a similar networking library. The server might then use a library like Express (for Node.js) to parse the incoming data.

Here's an example of how you might send FormData from an Expo app using the fetch API:

import React, { useState } from 'react'; import { View, Button, TextInput } from 'react-native'; export default function App() { const [username, setUsername] = useState(''); const [password, setPassword] = useState(''); const handleSubmit = async () => { const formData = new FormData(); formData.append('username', username); formData.append('password', password); try { const response = await fetch('', { method: 'POST', body: formData, }); if (response.ok) { // Handle successful response console.log('Login successful!'); } else { // Handle error response console.log('Login failed!'); } } catch (error) { // Handle fetch error console.error('Error:', error); } }; return ( <View> <TextInput placeholder="Username" value={username} onChangeText={setUsername} /> <TextInput placeholder="Password" value={password} onChangeText={setPassword} secureTextEntry /> <Button title="Login" onPress={handleSubmit} /> </View> ); }

On the server-side (e.g., using Node.js and Express), you can use the body-parser middleware to parse the incoming FormData. Here's an example of how you might handle the request on the server:

const express = require('express'); const bodyParser = require('body-parser'); const app = express(); app.use(bodyParser.urlencoded({ extended: false })); app.use(bodyParser.json());'/api/login', (req, res) => { const { username, password } = req.body; // Handle login logic here console.log('Received username:', username); console.log('Received password:', password); res.sendStatus(200); }); const PORT = 5000; app.listen(PORT, () => { console.log(`Server is running on port ${PORT}`); });

By setting up the server with the appropriate middleware, you should be able to receive the _parts field and access the form data fields (in this example, username and password) correctly on the server-side. Remember to adjust the server code based on your specific server framework and requirements.

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