User profile data in Firebase - Mini Project: Build & Apply

User profile data

📖 Scenario: You are building a simple user profile storage system using Firebase Realtime Database. Each user has a unique ID, a name, and an email address.

🎯 Goal: Create a Firebase Realtime Database structure to store user profiles, add a configuration variable for the default user role, write the logic to add a new user profile, and finalize the database rules to secure the data.

📋 What You'll Learn

Create a dictionary called users with two user profiles with exact IDs and data

Add a variable called defaultRole set to "user"

Write a function called addUserProfile that takes userId, name, and email and adds a new user with the defaultRole

Add Firebase Realtime Database rules to allow authenticated users to read and write their own profile only

💡 Why This Matters

🌍 Real World

Storing and managing user profiles securely is essential for many apps and websites. Firebase Realtime Database is a popular backend service for this.

💼 Career

Understanding how to structure user data and secure it with Firebase rules is a key skill for cloud developers and backend engineers.

1

Create initial user profiles

Create a dictionary called users with these exact entries: "user1" with {"name": "Alice", "email": "[e-mail]"} and "user2" with {"name": "Bob", "email": "[e-mail]"}.

Firebase

# Your code here

Need a hint?

Use a dictionary with user IDs as keys and dictionaries with name and email as values.

2

Add default user role configuration

Add a variable called defaultRole and set it to the string "user".

Firebase

users = {
    "user1": {"name": "Alice", "email": "[e-mail]"},
    "user2": {"name": "Bob", "email": "[e-mail]"}
}
# Your code here

Need a hint?

Just create a variable with the exact name and value.

3

Write function to add user profile

Write a function called addUserProfile that takes parameters userId, name, and email. Inside the function, add a new entry to the users dictionary with the given userId and a dictionary containing name, email, and role set to defaultRole.

Firebase

users = {
    "user1": {"name": "Alice", "email": "[e-mail]"},
    "user2": {"name": "Bob", "email": "[e-mail]"}
}
defaultRole = "user"
# Your code here

Need a hint?

Define a function with the exact name and parameters, then assign the new user dictionary to users[userId].

4

Add Firebase Realtime Database security rules

Add Firebase Realtime Database rules as a JSON string variable called databaseRules that allows authenticated users to read and write only their own profile under /users/<userId>. Use auth != null and auth.uid == userId conditions.

Firebase

users = {
    "user1": {"name": "Alice", "email": "[e-mail]"},
    "user2": {"name": "Bob", "email": "[e-mail]"}
}
defaultRole = "user"

def addUserProfile(userId, name, email):
    users[userId] = {"name": name, "email": email, "role": defaultRole}
# Your code here

Need a hint?

Use a JSON string with rules for /users/$userId path and conditions for read and write.