swagger

                                    It is tool which give user interface to Restful Api's.
And we can speed the development process

                                    ● Swagger is an open-source software framework backed 
by a large ecosystem of tools that helps developers design, 
build, document, and consume RESTful Web services. 
● Swagger allows you to describe the structure of your APIs 
so that machines can read them. 
● The ability of APIs to describe their own structure is the 
root of all awesomeness in Swagger 
● similar to xml schema but for Json

                                    The Swagger UI is an open source project to visually render documentation for 
an API defined with the OpenAPI (Swagger) Specification

                                    $ curl -I "https://petstore.swagger.io/v2/swagger.json"HTTP/1.1 200 OKDate: Sat, 31 Jan 2015 23:05:44 GMTAccess-Control-Allow-Origin: *Access-Control-Allow-Methods: GET, POST, DELETE, PUT, PATCH, OPTIONSAccess-Control-Allow-Headers: Content-Type, api_key, AuthorizationContent-Type: application/jsonContent-Length: 0

                                    we use swagger for API documentation. :))