Learn NESTJS with Real Code Examples

Build a CRUD REST API

Implement JWT authentication

Create GraphQL resolver

Set up WebSocket chat server

Integrate a microservice with RabbitMQ

Check TypeScript compilation errors

Verify DI registration of providers

Ensure module imports are correct

Debug middleware and guard execution

Check runtime logs for exceptions

Unit-test services and modules with Jest

Integration tests for controllers

E2E testing with Supertest

Mock dependencies using DI

Test guards, pipes, and interceptors

Deploy Node.js backend to cloud (AWS, Azure, GCP)

Dockerize application

Use PM2 or Node process managers

Host REST/GraphQL APIs behind Nginx or reverse proxy

Integrate CI/CD pipelines

Nest CLI for scaffolding

Node.js runtime

TypeORM, Prisma, or Mongoose for databases

Jest for testing

Swagger integration for API documentation

Database ORM/ODM (TypeORM, Prisma, Mongoose)

GraphQL (Apollo Server)

WebSockets (Socket.io)

Messaging queues (RabbitMQ, Kafka)

Third-party APIs and authentication services

Use Nest CLI for scaffolding

Reuse modules and providers

Leverage decorators for clean code

Write tests alongside features

Use TypeScript type-checking to prevent runtime errors

Learning TypeScript and decorators

Structuring modules efficiently

Dependency Injection understanding

Testing complex services and controllers

Scaling backend architecture