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How To Implements Security in Firebase?

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

Read and Write -
{
   "rules": {
      "users": {
         "$uid": {
            ".write": "$uid === auth.uid",
            ".read": true
         }        
      }
   }
}

 Validate -
{
   "rules": {
      "todo": {
         ".validate": "yourData.isString()"
      }     
   }
}

 Stayed Informed - Firebase Tutorial for Android and IOS

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