matrix-rust-sdk/test_data/events/message_text.json

{
    "content": {
        "body": "is dancing", "format": "org.matrix.custom.html",
        "formatted_body": "<strong>is dancing</strong>",
        "msgtype": "m.text"
    },
    "event_id": "$152037280074GZeOm:localhost",
    "origin_server_ts": 1520372800469,
    "sender": "@example:localhost",
    "type": "m.room.message",
    "unsigned": {
        "age": 598971425
    }
}