*** [https://github.com/apiaryio/dredd Dredd]+[http://apiblueprint.org/ apiblueprint] (perhaps directly via the webservice at http://apiary.io/) which makes it possible to keep specification, documentation and example in one place and test the REST API against the specification and use the examples as test cases.
*** [http://developers.helloreverb.com/swagger/ Swagger]
*** [httpshttp://githubjson-schema.comorg/mashery/iodocs I/O DocsJSON Schema]
** Use static mock json objects under different URLs to provide mock server-side data for testing the webfrontend