{
	"add link": {
		"POST": "/api/add",
		"body": {
			"tinyurl": "bd",
			"fullurl": "https://www.baidu.com",
			"intro": "百度"
		}
	},
	"check unique":{
		"POST": "/api/check",
		"body": {
			"tinyurl": "bd"
		}
	},
	"login": {
		"POST": "/api/login",
		"body": {
			"username": "username",
			"password": "password"
		}
	},
	"update link": {
		"PUT": "/api/update/:id",
		"body": {
			"tinyurl": "bd",
			"fullurl": "https://www.baidu.com",
			"intro": "百度"
		}
	},
	"delete link": {
		"DELETE": "/api/delete/:id"
	},
	"get all links": {
		"GET": "/api/links"
	}
}

{
  "links": [
    {
      "_id": "589f5f7fe6908f74c73869cf",
      "tinyurl": "bd",
      "fullurl": "https://www.baidu.com",
      "intro": "百度",
      "__v": 0,
      "createAt": "2017-02-11T19:01:19.583Z"
    }
  ]
}