# Custom Decorators — NestJS

Source: https://www.geekswithgeeks.com/en/nestjs/nestjs-custom-decorators

> Create your own decorators for reusable parameter or class-level logic.

## Parameter decorator

Extract specific values from the request using a custom decorator.

```typescript
import { createParamDecorator, ExecutionContext } from '@nestjs/common';

export const User = createParamDecorator(
  (data: unknown, ctx: ExecutionContext) => {
    const request = ctx.switchToHttp().getRequest();
    return request.user;
  }
);

// usage
@Get('profile')
getProfile(@User() user) {
  return user;
}
```

## Method decorator

Mark methods with custom logic—e.g. `@Public()` to skip guards, or `@Roles()` for role-based access.

```typescript
export const Public = () => SetMetadata('isPublic', true);
export const Roles = (...roles: string[]) => SetMetadata('roles', roles);

@Public()
@Get('health')
health() {
  return { status: 'ok' };
}
```