Firebase - Security

Security in Firebase is handled by setting the JSON like object inside the security rules. Security rules can be found when we click on Database inside the side menu and then RULES in tab bar.

In this chapter, we will go through a couple of simple examples to show you how to secure the Firebase data.

Read and Write

The following code snippet defined inside the Firebase security rules will allow writing access to /users/'$uid'/ for the authenticated user with the same uid, but everyone could read it.

Example

Let us consider the following example.

{
   "rules": {
      "users": {
         
         "$uid": {
            ".write": "$uid === auth.uid",
            ".read": true
         }
         
      }
   }
}		
			

Validate

We can enforce data to string by using the following example.

Example

{
   "rules": {
      
      "foo": {
         ".validate": "newData.isString()"
      }
      
   }
}		
			

This chapter only grabbed the surface of Firebase security rules. The important thing is to understand how these rules work, so you can combine it inside the app.