jsonbox.io lets you store, read & modify JSON data over HTTP APIs for free. Copy the URL below and start sending HTTP requests to play around with your data store.
Oh, this will come in handy for Workshops and quick Proof Of Concepts:
curl -X POST 'https://jsonbox.io/demobox_6d9e326c183fde7b' \
-H 'content-type: application/json' \
-d '{"name": "Jon Snow", "age": 25}'
// {"_id":"5d776a25fd6d3d6cb1d45c51","name":"Jon Snow","age":25,"_createdOn":"2019-09-10T09:17:25.607Z"}
Don’t know about the retention policy though 😉