Webapp

A scalable User Management Service built with Node.js and Express.js, supporting CRUD operations along with email verification during user registration. The infrastructure is deployed on AWS, provisioned using Terraform.

Features

• User Management: Provides complete CRUD functionality for managing user information.
• Health Monitoring: Includes a dedicated endpoint to monitor the application’s health and its connected services.
• Secure Deployment: Ensures data protection through HTTPS using SSL certificates and customer-managed encryption keys.
• Scalability and Reliability: Achieves high availability and scalability using managed instance groups and load balancers.
• Event-Driven Architecture: Leverages AWS SNS and lambda Functions to send verification emails through Mailgun.

Architecture Diagram

Technologies used:

• Programming Language: JavaScript
• Relational Database: PostgreSQL
• Backend Framework: Node.js, Express.js
• ORM Framework: Sequelize

To run the packer build command

Create variables.pkrvars.hcl file with the following fields:

aws_profile    = ""
vpc_default    = ""
subnet_default = ""
artifact_path  = ""
ami_name       = ""
instance_type  = ""
region         = ""

db_user     = ""
db_password = "" 
db_name     = ""

source_ami_id   = ""
demo_account_id = ""

To build and run the application locally

1. Generate npm packages

npm install

2. Add .env file

PORT=
DB_HOST=
DB_PORT=
DB_USER=
DB_PASSWORD=
DB_DATABASE=
DB_POOL_MAX=
DB_POOL_MIN=
DB_POOL_ACQUIRE=
DB_POOL_IDLE=
BCRYPT_SALT_ROUNDS=
TOKEN_EXPIRATION_TIME=
CLOUDWATCH_LOG_GROUP=
CLOUDWATCH_LOG_STREAM=
AWS_REGION=
ENVIRONMENT=
S3_BUCKET_NAME=
AWS_PROFILE=
SNS_TOPIC_ARN=

3. To Run the Application

npm run start

4. To Debug the Application

npm run dev

5. To Run tests for the Application

npm run test

To Setup Infra with Terraform

• refer the tf-aws-infra repo - link to IaC repo

References

1. Creating users and managing psql
2. Sequelize
3. Cache-Control
4. HTTP Status Codes