How to Fix CSRF Error in React Native

If you've encountered a CSRF Error while working with React Native, you're not alone. This is one of the most common issues developers face.

What Causes This Error

CSRF errors happen when your application can't verify that a form submission originated from your own site. Without proper token validation, the server rejects the request to prevent malicious cross-site attacks.

The Fix

The key is to store the CSRF token from your server and attach it to every subsequent request:

import AsyncStorage from "@react-native-async-storage/async-storage";

export async function secureFetch(url, options = {}) {
  const token = await AsyncStorage.getItem("csrfToken");
  return fetch(url, {
    ...options,
    headers: { ...options.headers, "X-CSRF-Token": token },
  });
}

// After login, store the token from server response
const res = await fetch("/api/login", { method: "POST", body });
const { csrfToken } = await res.json();
await AsyncStorage.setItem("csrfToken", csrfToken);

Common Pitfall

A common mistake is to ignore this error during development because it only surfaces under specific conditions. Always test with production-like settings to catch these issues early. If you're working in a team, document this fix in your project's troubleshooting guide so others don't hit the same wall.

Verify the Fix

After applying the fix, restart your React Native application and verify the error no longer appears in the console or logs. Test both the happy path and edge cases to be thorough. If the error persists, double-check that your changes were saved and the application fully restarted.

Prevention

Want to catch errors like this before they reach production? [Bugsly](https://bugsly.dev) provides real-time error tracking for React Native applications.