Swagger config in main.ts

main.ts

 const config = new DocumentBuilder()
    .setTitle('Service API')
    .setDescription('Service API')
    .setVersion('1.0')
    .addServer('/api/service')
    .addServer(`http://localhost:${port}/`)
    .addBearerAuth()
    .build();
  const document = SwaggerModule.createDocument(app, config);
  SwaggerModule.setup('swagger', app, document);
  app.use('/swagger.json', (req, res) => {
    res.send(JSON.stringify(document));
  });