How to only allow one admin user to write Firebase Database?

Question

I am trying to set up a Firebase database that only I can write. So no user will have permission to write anything. But everyone will be able to read it.

However, I could not set up the rules for it. I have one admin user that I created using Email/Password login, and I know its UID. Let's say my UID is: dJrGShfgfd2

I tried these two methods, but they didn't allow me to write to database.

{
  "rules": {
    "events": {
      ".read": true,
      ".write": "auth.uid === 'dJrGShfgfd2'"
    }
  }
}

.

{
  "rules": {
    "users": {
      "$user_id": {
        ".read" : true,
        ".write": "$user_id === 'dJrGShfgfd2'"
      }
    }
  }
}

So how do I allow only one user with a specific UID to write anything to database?

Answer 1

This should work:

{
  "rules": {
    ".read": true,
    ".write": "auth.uid === 'dJrGShfgfd2'"
  }
}

Everyone in the world will be able to read the data, but only the user with UID dJrGShfgfd2 (and processes with administrative access) can write the data.