{ "age": 242352, "content": { "membership": "join" }, "state_key": "@alice:localhost", "origin_server_ts": 1431961217939, "event_id": "$WLGTSEFSEF:localhost", "type": "m.room.member", "room_id": "!Cuyf34gef24t:localhost", "user_id": "@example:localhost" }