Swagger utils

• Do better documentation of API with with clearly arranged yaml files instead of one big file
• Add swagger UI to your backend for simple documentation reading

Instalation

Install package to our dependencies from NPM.

yarn add @qest/swagger-utils

or

npm install @qest/swagger-utils

Swagger generator

It generates swagger yaml or json from partials yaml files which is merged together. You can separate documentation to folders to the code that implements functionality.

Yamls has parts of swagger yaml. You can separate routes, responses, object definitions and security definitions.

This is example for file with some route

paths:
  /API/v1/swagger:
    get:
      produces:
        - text/plain
      description: get swagger documentation of project in raw (string) format
      responses:
        200:
          description: documentation of project in raw (string) format

...other can be like this

paths:
  /API/v1/something/{id}
    get:
      responses:
        200:
          $ref: '#/responses/somethingResponse'
    delete:
      responses:
        200:
          description: delete something      

...and file with responses and object can be together.

responses:
  somethingResponse:
    description: this is response with array of someting
    schema:
      type: "object"
      properties:
        data:
          type: "array"
          items:
            $ref: '#/responses/TreeItem'
definitions:            
  Item:
    type: object
    properties:
      id:
        type: string                
      name:
        type: string        

How to configure and use generator

Swagger generator has configuration object with these properties:

Property	Type	Default	Description
descriptorInfo	Object{ title:string; version:string; description:string; }		Info object whitch title, version and base description
includePaths	string[]	['./src']	Paths of folders that will be recursively crawled to find the yamls
excludedDirsFromPaths	string[]		This paths will be excludet from crawling. but only this folders, not their subfolders
schemes	string[]		Swagger definition of schemes (http, https, ws, etc..). If it's not defined, scheme of UI will be taken in swagger UI. Only for Swagger 2.0
host	string		Swagger host of API. If it's not defined, host of UI will be taken in swagger UI
basePath	string		Swagger basepath of API
changeLogPath	string		If you have changelog txt file in your application, it can be included to description of API
swaggerVersion	2.0 or 3.0	2.0	Version of swagger documentation

Example of configuration and use:

const swaggerGenerator = new SwaggerGenerator({
    descriptorInfo: { 
        version: '1.0.0', 
        title: 'something app', 
        description: 'description of app', 
    },
    includePaths: ['./path-to-docs-folders'],
    swaggerVersion: '2.0',
});

const objectResult = swaggerGenerator.getAsObject();
const jsonResult = swaggerGenerator.getAsJson();

The resulting structure for getAsObject() will contain all of files from previous example in one object .

{
    "basePath":"/",
    "swagger":"2.0",
    "info":{
        "version":"1.0.0",
        "title":"something app",
        "description":"description of app"
    },
    "paths":{
        "/API/v1/swagger":{
            "get":{...},
        },    
        "/API/v1/something/{id}":{
            "get":{...},
            "delete":{...},
        },        
    }
    "definitions":{
        "Item":{...}
    },
    "securityDefinitions":{...},
    "tags":[]
}

Swagger express middlewares

In project are express middlewares for integraion of documentation to our project. First middleware are for swagger UI and the second for datasource.

Router()
    .get('/api/v1/swagger', swaggerDataMiddleware(swaggerGenerator))
    .use('/swagger', swaggerUiMiddleware({
            swaggerOptions: {
                url: '/api/v1/swagger',
            },
        })
    );

Configuration

Swagger Data middleware

You must have instance of swagger generator and the second parameter say how data you can (json or yaml) in response.

Swagger UI middleware

For configuration see configuration of swagger UI library