FastAPI Login System with Google OAuth & JWT | Python Auth Microservice Tutorial

Опубликовано: 05 Июнь 2026
на канале: CodingBySagar

409

In this video, we build a standalone login system using Python FastAPI. This is Part 3 of the CreatorCopilot series, where we create a dedicated Auth Microservice that can verify Google login tokens, create or fetch users from the database, and generate JWT access and refresh tokens.

In the previous part, we completed Google login on the Next.js frontend using Auth.js. In this part, we move authentication logic to a backend auth service using FastAPI, SQLAlchemy, PostgreSQL-ready configuration, Pydantic schemas, Google OAuth token verification, and JWT authentication.

This video is useful if you are building a Python login system, FastAPI authentication API, Google OAuth backend, JWT auth system, or a microservice-based authentication flow similar to what you might build with Django, Flask, or FastAPI.

What you will learn:
How to create a standalone FastAPI auth service
How to structure a Python authentication microservice
How to configure environment variables in FastAPI
How to connect SQLAlchemy with a database
How to create a user model
How to define request and response schemas using Pydantic
How to verify Google ID tokens in Python
How to generate JWT access and refresh tokens
How to create Google login and token refresh endpoints
How to run the FastAPI auth service standalone using Uvicorn

Timestamps:
00:00 Introduction & Recap of Frontend Auth
00:33 Auth Service Architecture & Workflow
01:22 Initialising the FastAPI Service & Folder Structure
02:50 Setting up Dependencies (requirements.txt)
04:31 Configuring Environment Variables (core/config.py)
07:37 Database Setup with SQLAlchemy (core/database.py)
09:00 Creating the User Model (db/user_model.py)
10:04 Adding Pydantic Schemas (schemas/auth_schemas.py)
10:44 Setting up Routes & Security Helpers (security.py)
11:30 Explaining the Google Login Route & Payload Decoding
14:24 Handling the Token Refresh Route
15:42 Updating main.py (Lifespan & CORS Middleware)
17:12 Creating and Activating a Virtual Environment
18:27 Installing Packages
19:03 Running and Testing the FastAPI App
19:44 Outro & Next Steps

Commands used:
uvicorn app.main:app --reload --host 127.0.0.1 --port 8001

Tech Stack:
Python
FastAPI
SQLAlchemy
Pydantic
PostgreSQL
Google OAuth
JWT
python-jose
Uvicorn

This is a practical backend authentication tutorial for developers who want to build a real login system instead of only using frontend authentication. The same concepts can also help if you are coming from Django login systems, Flask authentication tutorials, or building a microservice-based backend architecture.

Next video:
We will Dockerize this FastAPI auth service, connect it with PostgreSQL using Docker Compose, and understand how microservices communicate inside Docker networks.
GitHub / Source Code: https://github.com/sagarsangwan/code-...
Diagrams - https://drive.google.com/file/d/1tc4X...
https://drive.google.com/file/d/1EKUh...

CreatorCopilot Series:
• Full Stack AI SaaS: Django API Gateway, Do...

#FastAPI #Python #JWT #GoogleOAuth #Authentication #BackendDevelopment #Microservices #PythonTutorial #sagarsangwan

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