How do I implement authentication in a React Native app using fetch?

How do I implement authentication in a React Native app using fetch?

To implement authentication in a React Native app using fetch, you can follow these steps: 1. Set up your backend API for authentication. 2. Use the fetch API to send a POST request with user credentials. 3. Handle the response to check if authentication is successful. 4. Store the authentication token securely.

Can you show me a code example for the fetch request?

Sure! Here's a simple example:

fetch('https://yourapi.com/auth', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ username, password }),
})
.then(response => response.json())
.then(data => {
  if (data.token) {
    // Store the token
    AsyncStorage.setItem('token', data.token);
  } else {
    // Handle authentication error
  }
})
.catch(error => console.error('Error:', error));

What should I do with the token after I get it?

After receiving the token, you should store it securely, typically using AsyncStorage. You can then include this token in the headers of subsequent requests to authenticate the user.