gistfile1.js

package.json:
{
  "dependencies": {
    "swagger-client": "2.1.2-M1"
  }
}


test.js:
var swagger = require('swagger-client');

var api = new swagger.SwaggerClient();
swagger.authorizations.add('api_key', new swagger.ApiKeyAuthorization('api_key', 'special-key', 'header'));
api.initialize({url: 'http://petstore.swagger.io/v2/swagger.json', success: function () {
  api.pet.getPetById({petId: 1}, function (data) {
    console.log(data.obj);
  })
}})

// to run:
node test.js