KC-APP-Server/src/main.ts

import { NestFactory } from '@nestjs/core';
import { ValidationPipe } from '@nestjs/common';
import { WsAdapter } from '@nestjs/platform-ws';
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  app.setGlobalPrefix('api');
  app.useGlobalPipes(new ValidationPipe({ whitelist: true, transform: true }));
  app.enableCors();
  app.useWebSocketAdapter(new WsAdapter(app));
  await app.listen(process.env.PORT ?? 3000);
}
bootstrap();