Learn NESTJS with Real Code Examples

Install Node.js and npm

Install Nest CLI: `npm i -g @nestjs/cli`

Create project: `nest new project-name`

Install dependencies and start development server

Run `npm run start:dev` for hot reload

Install Node.js and npm

Install Nest CLI

Create project and install dependencies

Set up TypeScript compiler

Run development server and hot reload

nest-cli.json - CLI config

tsconfig.json - TypeScript config

package.json - dependencies and scripts

src/main.ts - bootstrap file

src/app.module.ts - root module

nest new project-name

nest generate module users

nest generate controller users

nest generate service users

nest build/start

Use i18n packages for localization of messages

Translate error messages and logs

Format dates/numbers based on locale

Support multi-language APIs

Externalize all user-facing strings

Ensure APIs are consistent and well-documented

Handle errors gracefully with HTTP status codes

Provide clear and structured responses

Enable CORS and authentication where required

Follow API design best practices

Not applicable; backend framework

Serve static assets if needed

Integrate with templating engines if required

API responses structured in JSON

Optionally render server-side templates (e.g., Handlebars, Pug)

Stateless HTTP request handling

Service-level shared state via DI

Use database or cache for persistent state

Message queues for event-driven state

Avoid in-memory mutable global state

Integrate with relational/non-relational DB

Use ORMs like TypeORM or Prisma

Validate and transform input via Pipes

Serialize/deserialize JSON for APIs

Caching via Redis or in-memory services