Saving the swagger document

We have covered all of the available decorators in the Nest.js swagger module and the decorators already available in Nest.js to produce a swagger document and expose the swagger UI. This works great when your APIs are primarily used by developers in their own projects or when testing the APIs on a local development server or in a staging environment. For APIs that are primarily used for a specific front-end application, you may not wish to expose the swagger UI for the general public to be able to use. In such a case, you can still produce a swagger document for storage and use it on your own or your teams other projects.

To accomplish this, we will write a new Typescript file that can be executed as part of a build chain. We will use the fs-extras NodeJS module to make writing our file to disk much simpler.

import * as fs from 'fs-extra';

async function writeDoc() {
    const app = await NestFactory.create(AppModule);
    const document = SwaggerModule...