Shameless plug: along the same lines, but for rapid web UI prototyping cases where you don't want to waste time with setting up a server, I built a tiny tool called REM[0] a few years ago.
It never actually stores data on the server (it echos it into a cookie instead), so the dataset is only ever visible to you, no auth or service keys required.
It never actually stores data on the server (it echos it into a cookie instead), so the dataset is only ever visible to you, no auth or service keys required.
[0] http://rem-rest-api.herokuapp.com/