SwaggerUI: Path shows "Default". How can I change?

I downloaded sample server program from http://editor.swagger.io. (Swagger Petstore (Simple), NodeJS)

Then I deployed into my server but the path is showed "Default". How can I change it?

This sample shows the name of paths. This is what I want to do it. http://petstore.swagger.io/#/

package.json

"dependencies": {
  "connect": "^3.2.0",
  "js-yaml": "^3.3.0",
  "swagger-tools": "0.9.*"
}

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Update

This may be related. How to change Swagger-UI "Default" Path

I'm not sure how JSON file is necessary. I'm using yaml. I may be choose .json or .yaml.

And also I'm wondering this is related to my issue..

{
  schemaValidationMessages: [
    {
      level: "error",
      message: "Can't read from file http://xxxxx/api-docs"
    }
  ]
}