node -v
v10.16.0

npm -v
6.9.0

$ npm install -g swagger

$ swagger project create hello-world

? Framework? (Use arrow keys)
  connect
❯ express
  hapi
  restify
  sails

$ cd cd hello-world

//依存性のあるモジュールをインストールします
$ npm install

$ swagger project start

'use strict';
/*
 'use strict' is not required but helpful for turning syntactical errors into true errors in the program flow
 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
*/

/*
 Modules make it possible to import JavaScript files into your application.  Modules are imported
 using 'require' statements that give you a reference to the module.

  It is a good idea to list the modules that your application depends on in the package.json in the project root
 */
var util = require('util');

/*
 Once you 'require' a module you can reference the things that it exports.  These are defined in module.exports.

 For a controller in a127 (which this is) you should export the functions referenced in your Swagger document by name.

 Either:
  - The HTTP Verb of the corresponding operation (get, put, post, delete, etc)
  - Or the operationId associated with the operation in your Swagger document

  In the starter/skeleton project the 'get' operation on the '/hello' path has an operationId named 'hello'.  Here,
  we specify that in the exports of this module that 'hello' maps to the function named 'hello'
 */
module.exports = {
  goodbye: goodbye
};

/*
  Functions in a127 controllers used for operations should take two parameters:

  Param 1: a handle to the request object
  Param 2: a handle to the response object
 */
function goodbye(req, res) {
  // variables defined in the Swagger document can be referenced using req.swagger.params.{parameter_name}
  var name = req.swagger.params.name.value || 'stranger';
  var goodbye = util.format('Good bay, %s!', name);

  // this sends back a JSON response which is a single string
  res.json(goodbye);
}

paths:
  /hello:
    # binds a127 app logic to a route
    x-swagger-router-controller: hello_world
    get:
      description: Returns 'Hello' to the caller
      # used as the method name of the controller
      operationId: hello
      parameters:
        - name: name
          in: query
          description: The name of the person to whom to say hello
          required: false
          type: string
      responses:
        "200":
          description: Success
          schema:
            # a pointer to a definition
            $ref: "#/definitions/HelloWorldResponse"
        # responses may fall through to errors
        default:
          description: Error
          schema:
            $ref: "#/definitions/ErrorResponse"
  /goodbye:
    # binds a127 app logic to a route
    x-swagger-router-controller: goodbye
    get:
      description: Returns 'Good Bye' to the API Caller.
      # used as the method name of the controller
      operationId: goodbye
      parameters:
        - name: name
          in: query
          description: The name of the person to whom to say hello
          required: false
          type: string
      responses:
        "200":
          description: Success
          schema:
            # a pointer to a definition
            $ref: "#/definitions/HelloWorldResponse"
        # responses may fall through to errors
        default:
          description: Error
          schema:
            $ref: "#/definitions/ErrorResponse"