React + Firebase Security Blueprint

To secure a React + Firebase SPA, you need to: (1) replace test-mode Firestore rules with production security rules, (2) configure Storage rules for secure file uploads, (3) implement proper Firebase Auth state management, (4) add production domains to Firebase Auth authorized domains, and (5) test rules thoroughly with the Firebase Emulator. This blueprint covers client-only Firebase security patterns.

TL;DR

React SPAs with Firebase depend on Firestore Security Rules for protection. Key tasks: replace test-mode rules with production rules, configure Storage rules, use Firebase Auth with proper state management, and remember that client-side route protection is UX-only-rules are your security.

Firestore Rules Firebase

firestore.rules

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /users/{userId} {
      allow read, update: if request.auth != null
        && request.auth.uid == userId;
    }
    match /posts/{postId} {
      allow read: if true;
      allow write: if request.auth != null
        && request.resource.data.authorId == request.auth.uid;
    }
  }
}

Rules are your security. In an SPA, there's no server. Your Firestore rules are the only thing preventing unauthorized access.