We all know that securing your database from malicious or misguided clients is critical. And with Security Rules for Cloud Firestore, you can create a very powerful access control system with simple matching syntax and logic. Until now, however, testing your rules was difficult. You couldn’t test your rules before deploying them, and running arbitrary tests against these rules (to ensure they work
![Announcing the Firestore Security Rules Simulator!](https://cdn-ak-scissors.b.st-hatena.com/image/square/190df45ec2a39064764c62ac5c00830d5a59979c/height=288;version=1;width=512/https%3A%2F%2Ffirebase.blog%2Fimg%2Fog.png)