Setup

After installing the package, create a new file api_spec_config.json in the folder that contains your package.json file. The contents of the new file should be as follows:

{
    "specfile":"./src/constants/APISpec.json",
    "updateSpecs":true
}

specfile specifies the location of the file in which the updated documentation is to be written.

updateSpecs specifies if the documentation is to be updated on new API calls.

Local Specification

Use the exported middleware APIDocMiddleware before the controllers whose transactions you wish to capture for documentation.

@JsonController('/route')
@UseBefore(APIDocMiddleware)
export class MyRoutesController{
    ...
}

Global Specification

Specify middlewares: [APIDocMiddleware] in createExpressServer

Swagger Integration

And here's the setup in the app.ts file:

import swaggerUi from 'swagger-ui-express';
import { readFileSync } from "fs";
import { APIDocMiddleware } from "doc-catcher";
const app: express.Application = createExpressServer({
    cors: {
        origin: ...,
        methods: "GET,POST,PUT,PATCH,DELETE",
        credentials: true
    },
    controllers: [__dirname + "/controllers/**"],
    /*
    just for global integration:
    middlewares: [APIDocMiddleware]
    */
});
if (nodeEnvironment !== "production") {
    app.use('/docs', swaggerUi.serve, swaggerUi.setup(
        JSON.parse(
        readFileSync(
        APIDocMiddleware.specPath,
        { encoding: 'utf-8', flag: 'r' }
        )
        )
    ))
}
export default app;

Testing and Setup

The contents of the APISpec.json when it's created

{
  "openapi": "3.0.1",
  "info": {
    "version": "1.0.0",
    "title": "REST API for 'the repository to replace all repositories'",
    "description": "This is the REST API for my repository. It isn't entirely useless."
  },
  "servers": [],
  "tags": [],
  "paths": {}
}