gem “grape”

Structure files as in /api

Route

mount API::Base => '/api' 

Swagger documentation

gem ‘grape-swagger’

Clone swagger UI: github.com/wordnik/swagger-ui

Copy dist content to public/api/docs

Change this line:

window.swaggerUi = new SwaggerUi({

// url: "http://petstore.swagger.wordnik.com/api/api-docs", url: "/api/swagger_doc.json", // <---- HERE dom_id: "swagger-ui-container",

After this you can check the API documentation and test it on: localhost:3000/api/docs/