Install Swagger in Nestjs

1. npm install @nestjs/swagger swagger-ui-express
   in main.ts

import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';

const options = new DocumentBuilder()
    .setTitle('API ***')
    .setDescription('API ***')
    .setVersion('7.1.8')
    .addBearerAuth() 
    .addTag('api')
    .build();

  const document = SwaggerModule.createDocument(app, options);
  SwaggerModule.setup('docs', app, document, {
    swaggerOptions: {
      persistAuthorization: true,
    },
  });

Decorator In controller : ApiBearerAuth, ApiTags

Decorator In DTO: ApiProperty

2. set password for use swagger page

npm install express-basic-auth

in main.ts

   app.use(
    // Paths you want to protect with basic auth
    '/docs*',
    basicAuth({
      challenge: true,
      users: {
        swaggerAdmin: '*****',
      },
    }),
  );

Enjoy