Firestore data can be secured using Firebase Security Rules. These rules provide granular control over who has read and write access to documents in your database. They are written in an expressive syntax that allows you to match on paths, validate incoming data, and use built-in functions to enforce complex authorization logic.
To start with, ensure all Firestore databases have default security rules set up during creation. This prevents unauthorized access from the outset. Then, define custom rules based on your application’s requirements. For instance, you may want to restrict certain collections to authenticated users only or limit modifications to document owners.
Remember to test these rules thoroughly before deploying them to production. The Firebase Emulator Suite is a useful tool for this purpose as it allows local testing of security rules.
Lastly, keep your security rules updated as your application evolves. Regularly review and refine them to maintain optimal security levels.
