Firebase Tutorial — Jack Burkholder

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Full tutorial (Markdown source)

What is BaaS?

"Backend as a Service" (BaaS) is a cloud computing model that provides ready-to-use backend infrastructure.
With BaaS, developers can focus more on front-end development, since core backend functionality like databases and authentication comes prebuilt.

What is Firebase?

Firebase is a BaaS platform developed by Google.
It's known for its scalability and ease of integration across different frameworks.
Firebase offers various SDKs and tools, including a powerful real-time NoSQL database.
This tutorial focuses specifically on Firebase's Realtime Database.

How the Realtime Database works

Firebase Realtime Database is a cloud-based NoSQL database that syncs data in real time across every connected client.
Changes made by one client are instantly reflected on others, using WebSockets — a persistent, two-way communication channel between client and server.
Being NoSQL, it stores data in a schema-less, JSON-based format, which stays flexible across data types and use cases.

Firebase Realtime Database vs. PostgreSQL

Feature	Firebase Realtime Database	PostgreSQL
Type	NoSQL (JSON-based, hierarchical)	SQL (relational)
Structure	Schema-less; data stored as JSON	Structured; tables, rows, and relationships
Querying	Limited; hierarchical traversal	Full SQL querying, joins, and aggregations
Scalability	Built for real-time sync on mobile/web apps	Scales for complex queries and enterprise workloads
Transactions	Basic, with limited capabilities	ACID-compliant, for complex operations
Data consistency	Event-driven; eventual consistency	Strong consistency with transactional integrity
Offline support	Built-in offline mode for mobile apps	Needs additional configuration
Security	Rules-based, with Firebase Authentication	Fine-grained roles, permissions, and encryption
Use cases	Real-time chat, live updates, IoT	Enterprise apps, financial systems, analytics

Table generated by Microsoft Copilot.

A couple of terms

JSON is a plain-text, human- and machine-readable format used for data interchange.
Hierarchical databases are tree-like structures commonly used in web apps.

Diagram of a hierarchical database structure

Where Firebase fits

Since it's built around a real-time database, Firebase is a strong fit for:

Chat apps
Collaborative tools, like Replit
Live dashboards, like trading views
Social apps with a lot of unstructured data, where a NoSQL model helps

Getting started with Firebase

All you need to begin is a Firebase app with a Realtime Database attached.

Go to firebase.google.com
Click "Get started in console"
Create an app and follow the prompts
Under "Build" in the sidebar, choose Realtime Database and create one (use Test Mode for tutorials)

Connecting from your terminal

Install the Firebase Admin SDK: pip install firebase_admin
Create a project directory and a Python file (e.g. main.py)
Copy the template below and swap in your own credentials:

import firebase_admin

cred_obj = firebase_admin.credentials.Certificate('....path to file')
default_app = firebase_admin.initialize_app(cred_obj, {
    'databaseURL': databaseURL
})

from firebase_admin import db
ref = db.reference("/")

import json
with open("objects.json", "r") as f:
    file_contents = json.load(f)
ref.set(file_contents)

Adding objects to the database

In the code above, objects.json is opened and its contents sent to Firebase with ref.set().
Create a JSON file named objects.json with data shaped like this:

{
    "Object": {
        "Attribute1": "Beep",
        "Attribute2": "Boop"
    }
}

Run the Python script, and the objects should appear in your Firebase Realtime Database console.