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Cloud & DevOps · Mini Project
Serverless Notes API with Cognito Auth
A private notes CRUD API on Lambda, secured with Cognito JWTs
1-2 weeks build
Overview
A small API where each user sees only their own notes. Users sign up and log in through a Cognito user pool, API Gateway checks the JWT before any Lambda runs, and handlers read the user ID from the token claims to scope every DynamoDB query. Create, read, update and delete are covered with input validation and tests. The stack is one SAM template and fits the AWS free tier.
What makes it stand up
- 01Sign-up, login and token refresh through a Cognito user pool
- 02JWT authoriser on API Gateway, so bad tokens never reach Lambda
- 03Every query scoped to the caller's user ID from the token
- 04DynamoDB table keyed by user and note for efficient listing
- 05One SAM template, local invoke and a free-tier-sized deployment
Module breakdown
- 01
Auth
Cognito user pool, app client and token handling.
- 02
API
HTTP API routes with a JWT authoriser attached.
- 03
Handlers
Python Lambdas for each CRUD operation with validation.
- 04
Storage
DynamoDB key design with user ID as the partition key.
- 05
Testing
Unit tests, sam local invoke and a Postman collection.
After this, you will be able to
- Explain what a JWT carries and how the API verifies it
- Defend why ownership comes from the token, not the request body
- Demo one user failing to read another user's note
Technology stack
- AWS SAM
- AWS Lambda
- API Gateway
- DynamoDB
- Amazon Cognito
- Python
- Level
- Mini Project
- Domain
- Cloud & DevOps
- Build time
- 1-2 weeks
- Difficulty
You receive
- Complete, commented source code
- 60-90 page project report (IEEE format)
- Editable presentation deck
- Architecture, ER and UML diagrams
- Local setup and deployment guide
- Sample dataset or seed data
- Viva question bank with answers
- One 45-minute walkthrough call
- 30 days of doubt-clearing support