What are common mistakes when writing Firestore security rules?

What are common mistakes when writing Firestore security rules?

Some common mistakes include overly permissive rules, not validating data types, and failing to account for user roles.

Can you give an example of an overly permissive rule?

Sure! A rule like allow read, write: if true; allows anyone to read and write data, which is a major security risk.

How can I validate data types in my rules?

You can use the isString(), isNumber(), and other type-checking functions in your rules to ensure data integrity.

What should I consider when defining user roles?

Consider the principle of least privilege, granting users only the permissions they need to perform their tasks.