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https://github.com/rproenza86/mern-on-aws


https://github.com/rproenza86/mern-on-aws

api-gateway authorizer-serverless aws aws-cdk-typescript aws-cognito aws-s3 aws-sdk-javascript cloudfront dynamodb iac lambda-functions reactjs s3-bucket

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README 

        
# Project README - TODO Web App



## Overview

This project is a monorepo MERN stack web application designed to manage TODO tasks. It is hosted on AWS and utilizes various services and technologies for a robust, scalable application.



## Features

The application supports the following features:

- Create, retrieve, update, and delete TODO tasks.

- Real-time updates and state management on the frontend.

- Secure and scalable hosting on AWS.



## Technical Details



### Frontend



#### Technologies & Libraries

- React: A JavaScript library for building user interfaces.

- Tailwind CSS: A utility-first CSS framework for rapid UI development.

- React Context API: Used for state management across the React components.



#### Key Components

- TodoList: Displays the list of TODO tasks and handles interactions.

- GlobalContext: Manages the global state of the application, including TODO tasks and loading states.



### Backend



#### Technologies & Libraries

- Node.js: JavaScript runtime built on Chrome's V8 JavaScript engine.

- AWS Lambda: Event-driven, serverless computing service.

- AWS API Gateway: Fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs.

- Amazon Cognito: Provides user authentication and authorization.



#### Lambda Functions

- CreateTodoLambda: Handles the creation of new TODO tasks.

- GetTodosLambda: Retrieves all TODO tasks.

- UpdateTodoLambda: Updates existing TODO tasks.

- DeleteTodoLambda: Deletes TODO tasks.

- GenPresignedUrlLambda: Generates presigned URLs for S3 uploads.



### Infrastructure



#### Technologies & Frameworks

- AWS CDK: Framework for defining cloud infrastructure using familiar programming languages.

- Amazon DynamoDB: NoSQL database service that provides fast and predictable performance with seamless scalability.

- Amazon S3: Object storage service that offers industry-leading scalability, data availability, security, and performance.



#### Key Constructs

- BackendConstruct: Sets up the backend services including Lambda functions and API Gateway.

- DataBaseConstruct: Manages the DynamoDB resources.

- S3Construct: Manages the S3 buckets for static file hosting and image uploads.



#### Deployment

- S3 Bucket: Hosts the static files for the frontend.

- CloudFront: CDN service that securely delivers data, videos, applications, and APIs to customers globally.



### Security



#### Authentication & Authorization

- **Amazon Cognito**: Used for user authentication and authorization.

- **API Gateway Authorizers**: Secures API endpoints using Cognito user pools.



### Programming Techniques

- **Infrastructure as Code (IaC)**: Using AWS CDK to define and provision AWS infrastructure.

- **Serverless Architecture**: Utilizing AWS Lambda for business logic, reducing the need for server management.

- **Continuous Integration and Deployment**: Automated build and deployment pipelines enhance the development process.



## Conclusion

This project leverages modern web technologies and AWS services to deliver a scalable and maintainable TODO web application. It demonstrates effective use of serverless architecture and IaC for efficient cloud resource management.