Backend service

Technical Approach

Core

• Programming language: Typescript
• Framework: NestJS
• Formatter: Prettier
• Code quality scanner: Eslint
• Pre-commit checker: CommitLint + Husky
• API docs: Swagger UI
• ENV manager: config + dotenv
• Authentication: jsonwebtoken + bcryptjs

Testing:

• Jest
• Supertest

Logger:

• pino (Default)
• winston
• NestJS logger

Payment Gateway

• stripe

Pubsub

• NestJS SSE
• NestJS Socket.IO

Message Streaming

• NestJS Event
• NestJS RabbitMQ
• Kafka
  • NestJS Kafka (Default)
  • confluent-kafka-javascript

ORM/ODM

• TypeORM
• mongoose

Database

• PostgreSQL
• MongoDB

Install

npm ci

Start dependency containers

docker-compose up -d postgres mongo kafka-admin rabbitmq

Setup mongo in cluster mode

docker-compose exec -it mongo mongosh --eval 'rs.initiate({ _id: "mongo-set", members: [{ _id: 0, host: "mongo:27017" }]})'

Run service

npm run start:dev
npm run start:prod

Run test

npm test
npm run test:e2e
npm run test:bvt

Run DB migration

Postgres

# generate new migration file
npm run migration:typeorm:generate --db=<db> ---name=<name>

# revert migration
npm run migration:typeorm:revert --db=<db>

MongoDB

# generate new migration file
npm run migration:mongo:generate --db=<db> ---name=<name>

# run migration
npm run migration:mongo:up --db=<db>

# revert migration
npm run migration:mongo:down --db=<db> -- --last  #Undo the last applied migration
npm run migration:mongo:down --db=<db> -- --all   #Undo all applied migrations

# check migration status
npm run migration:mongo:status --db=<db>