Example from your own post:

/posts/3982986000d1013510064860008dbc6c.json

{
"already_participated_in_poll": null,
"author": {
"avatar": {
"large": "https://pod.geraspora.de/uploads/images/thumb_large_b20f733cba8b964a1c1b.jpg",
"medium": "https://pod.geraspora.de/uploads/images/thumb_medium_b20f733cba8b964a1c1b.jpg",
"small": "https://pod.geraspora.de/uploads/images/thumb_small_b20f733cba8b964a1c1b.jpg"
},
"diaspora_id": "ga@pod.geraspora.de",
"guid": "189b2f203bb18aa9",
"id": 139,
"name": "Guido Arnold"
},
"created_at": "2017-04-11T10:40:37.000Z",
"guid": "3982986000d1013510064860008dbc6c",
"id": 797993,
"interacted_at": "2017-04-11T10:44:38.000Z",
"interactions": {
"comments_count": 1,
"likes": [],
"likes_count": 1,
"reshares": [],
"reshares_count": 1
},
"location": {
"address": null,
"lat": null,
"lng": null
},
"mentioned_people": [],
"nsfw": false,
"o_embed_cache": null,
"open_graph_cache": null,
"participation": false,
"photos": [],
"poll": null,
"post_type": "StatusMessage",
"provider_display_name": null,
"public": true,
"root": null,
"text": "#Diaspora #Question: is there a way to see the #Markdown code of a single post somehow? I thought I've seen something like this years ago but can't find anything in this regards now...",
"title": "#Diaspora #Question: is there a way to see the #Markdown code of a ..."
}