Creating your first NestJS application

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What’s NestJS?

When to use NestJS?

Why use NestJS?

Let’s start writing code

Ehm 😅
npm i -g @nestjs/cli
nest new TodoBackend
NestJS bootstrap logs
nest generate module todo
nest generate class todo/entities/Todo --no-spec
npm i @nestjs/typeorm typeorm sqlite3
nest generate service todo/services/todo
nest generate service todo/services/TodoMapper
nest generate controller todo/controllers/todo
public add(@Body() todo: AddTodoDto): Promise<TodoDto> {
npm i class-transformer class-validator
npm run start
npm run start:debug

Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP headers to tell browsers to give a web application running at one origin, access to selected resources from a different origin. […] For security reasons, browsers restrict cross-origin HTTP requests initiated from scripts. For example, XmlHttpRequest and the Fetch API follow the same-origin policy.




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