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Authentication Using AWS Cognito (Serverless Auth)

Why Choose This Project?

Authentication is a core feature of almost every modern application. AWS Cognito allows developers to implement secure, scalable, and serverless user authentication without managing any backend servers. It supports user sign-up, sign-in, MFA, social logins (Google, Facebook), and secure access control using JWT tokens — all in a fully managed, highly available system.

This project is ideal for building secure login systems for web or mobile apps with minimal backend code.

What You Get

Fully managed user authentication system
User registration, login, password reset
Multi-Factor Authentication (MFA) and OTP
Social login via Google, Facebook, Apple
Role-based access control using user groups
Token-based secure API access (JWT + OAuth2)

Key Features

Feature	Description
User Pool	Stores user credentials and profiles
Hosted UI (Optional)	Prebuilt login/signup UI hosted by Cognito
Custom Login UI Support	Use your own frontend and integrate using SDK
OAuth2.0 & JWT	Secure access tokens issued after login
Multi-Factor Authentication	Optional SMS/email-based 2FA
Password Policy & Recovery	Enforced complexity and forgot-password workflows
Federated Identity	Sign-in with Google, Facebook, Apple
User Groups & Roles	Role-based access control
Email/Phone Verification	Auto or custom workflows
Token Refresh	Access + Refresh token handling

Technology Stack

Layer	Technology
Authentication	AWS Cognito (User Pool + Identity Pool)
Frontend	HTML / React / Vue / Android / iOS
Authorization	JWT, OAuth 2.0
API Protection	API Gateway + Cognito Authorizer
Storage (optional)	S3 (for profile images or files)
IAM Roles	For access control to AWS resources

Cloud Services Used

AWS Service	Purpose
Amazon Cognito	Core identity service (User Pool, Identity Pool)
API Gateway	To expose secured APIs
AWS Lambda	Backend for handling logic (optional)
Amazon S3	Store user files/images securely
AWS IAM	Role-based permission assignment
CloudWatch	Logs and metrics for monitoring authentication events

Working Flow

User Registration or Login
- Via Hosted UI or custom frontend using Cognito SDK
Cognito Issues JWT Token
- Access token, ID token, refresh token
Token Sent to API Gateway
- Secured endpoint verifies token using Cognito authorizer
Optional Lambda Backend
- Validated requests are passed to Lambda for business logic
Role-Based Access
- IAM roles mapped to user groups for resource-level control
Session Management
- Access token expires; refresh token used for re-authentication

Main Modules

Module	Description
User Pool Setup	Create user pools, define attributes
App Client Setup	Generate credentials for frontend
Hosted UI / SDK	Optional UI for login/signup or SDK for custom UI
Federated Login	Setup identity providers (Google, FB, etc.)
Token Validation	JWT decoding in frontend/backend
API Protection	Attach Cognito authorizer to API Gateway routes
MFA Configuration	Enforce SMS/email-based 2FA
User Group Management	Assign roles and restrict access to certain APIs

Security Features

JWT-based Authentication: Valid, signed tokens with expiration
Multi-Factor Authentication: Optional OTP for login
Encrypted Passwords: Stored securely using Cognito hashing
Token Expiry & Rotation: Short-lived access tokens, long-lived refresh tokens
OAuth2.0 Compliance: Secure grant types and redirect flows
Fine-Grained Permissions: IAM-based policies mapped to roles
Custom Verification Flows: Customize email/phone verification