docs.nestjs.com/content/faq/multiple-servers.md

HTTPS

To create an application that uses the HTTPS protocol, set the httpsOptions property in the options object passed to the create() method of the NestFactory class:

const httpsOptions = {
  key: fs.readFileSync('./secrets/private-key.pem'),
  cert: fs.readFileSync('./secrets/public-certificate.pem'),
};
const app = await NestFactory.create(AppModule, {
  httpsOptions,
});
await app.listen(process.env.PORT ?? 3000);

If you use the FastifyAdapter, create the application as follows:

const app = await NestFactory.create<NestFastifyApplication>(
  AppModule,
  new FastifyAdapter({ https: httpsOptions }),
);

Multiple simultaneous servers

The following recipe shows how to instantiate a Nest application that listens on multiple ports (for example, on a non-HTTPS port and an HTTPS port) simultaneously.

const httpsOptions = {
  key: fs.readFileSync('./secrets/private-key.pem'),
  cert: fs.readFileSync('./secrets/public-certificate.pem'),
};

const server = express();
const app = await NestFactory.create(AppModule, new ExpressAdapter(server));
await app.init();

const httpServer = http.createServer(server).listen(3000);
const httpsServer = https.createServer(httpsOptions, server).listen(443);

Because we called http.createServer / https.createServer ourselves, NestJS doesn't close them when calling app.close / on termination signal. We need to do this ourselves:

@Injectable()
export class ShutdownObserver implements OnApplicationShutdown {
  private httpServers: http.Server[] = [];

  public addHttpServer(server: http.Server): void {
    this.httpServers.push(server);
  }

  public async onApplicationShutdown(): Promise<void> {
    await Promise.all(
      this.httpServers.map(
        (server) =>
          new Promise((resolve, reject) => {
            server.close((error) => {
              if (error) {
                reject(error);
              } else {
                resolve(null);
              }
            });
          }),
      ),
    );
  }
}

const shutdownObserver = app.get(ShutdownObserver);
shutdownObserver.addHttpServer(httpServer);
shutdownObserver.addHttpServer(httpsServer);

info Hint The ExpressAdapter is imported from the @nestjs/platform-express package. The http and https packages are native Node.js packages.

Warning

This recipe does not work with GraphQL Subscriptions.