Awesome

Simple REST API Explorer

A simple way to showcasing and exploring all endpoints of your RESTful API. Built by Bramus! - http://www.bram.us/

Edit the tad of JavaScript at the bottom of index.html

baseApiUrl: Base URL of your API. All endpoints are a subdomain/subpage of this URL. eg. http://api.website.tld/
apiDataType: The data type you expect back. Set this to json or jsonp.
apiExtraHeaders: Extra headers you want to send along with your request. Object Literal formatted. Provide an empty object if no headers need to be sent. eg. an API-Key or authentication token: {'X-API-Key':'1234567890'}
apiUrlSuffix: Extra suffix to add to each URL called. eg. an API-Key or authentication token: '&token=1234567890'

Update the <dl> in the #sidebar to hold the available endpoints of your API.

The value of the href attribute of the a element is an example call to the endpoint.
Provide a request method via a data-requestmethod attribute on the a element. Defaults to get
Provide extra data to be sent via a data-extradata attribute on the a element. Format it like you'd format a querystring.
For informational purposes, it is best to mention the request method and endpoint structure in the adjacent small element.

Only tested with APIs returning JSON or JSONP.
Custom headers don't work with JSONP. If you do need both JSONP and an API-Key: ask your API provider to enable CORS so you can switch to JSON.

Simple REST API Explorer is powered by (a tweaked) Kelp JSON View and Skeleton