Hashtags and JSON-LD¶
The examples here are various variations of creating the Hashtag element in the tag list. These variations can be useful in understanding how strict an application sees JSON-LD.
Hashtags are a good illustration of JSON-LD parsing as Hashtag is not part of the ActivityStreams vocabulary.
All examples except the first are questionable, and probably should not
be used when publishing to the Fediverse. The examples marked with
⚠️ are expected to fail with a JSON-LD parser. The examples using
as:Hashtag are expected to fail with a JSON only parser.
Examples¶
Example 1¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/activity/PTIcNTEOnJA",
"published": "2025-08-30T19:06:55Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/object/1NHPbn0BXks",
"published": "2025-08-30T19:06:55Z",
"content": "text",
"tag": [
{
"type": "Hashtag",
"name": "#test"
},
{
"type": "Mention",
"href": "http://hollo/@john"
}
]
}
}
hollo
{
"id": "0198fc60-2098-7fc7-850e-0dbd0244f14b",
"created_at": "2025-08-30T19:06:55.000Z",
"in_reply_to_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/object/1NHPbn0BXks",
"url": "http://pasture-one-actor/object/1NHPbn0BXks",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "text",
"reblog": null,
"quote_id": null,
"quote": null,
"application": null,
"account": {
"id": "0198fc5f-fd5f-7ea5-832e-88a2cd8e53de",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": false,
"bot": false,
"created_at": "2025-08-30T19:06:45.932Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://hollo/image/avatars/original/missing.png",
"avatar_static": "http://hollo/image/avatars/original/missing.png",
"header": "http://hollo/image/headers/original/missing.png",
"header_static": "http://hollo/image/headers/original/missing.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 0,
"moved": null,
"last_status_at": null,
"emojis": [],
"fields": []
},
"media_attachments": [],
"mentions": [],
"tags": [],
"card": null,
"emojis": [],
"emoji_reactions": [],
"poll": null,
"filtered": null
}
Example 2¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/activity/qFLodQts8jk",
"published": "2025-08-30T19:06:56Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/object/b29Ve2XC-D4",
"published": "2025-08-30T19:06:56Z",
"content": "using as:Hashtag",
"tag": [
{
"type": "as:Hashtag",
"name": "#test"
},
{
"type": "Mention",
"href": "http://hollo/@john"
}
]
}
}
hollo
{
"id": "0198fc60-2480-72c2-808b-d34d5da17837",
"created_at": "2025-08-30T19:06:56.000Z",
"in_reply_to_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/object/b29Ve2XC-D4",
"url": "http://pasture-one-actor/object/b29Ve2XC-D4",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "using as:Hashtag",
"reblog": null,
"quote_id": null,
"quote": null,
"application": null,
"account": {
"id": "0198fc5f-fd5f-7ea5-832e-88a2cd8e53de",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": false,
"bot": false,
"created_at": "2025-08-30T19:06:45.932Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://hollo/image/avatars/original/missing.png",
"avatar_static": "http://hollo/image/avatars/original/missing.png",
"header": "http://hollo/image/headers/original/missing.png",
"header_static": "http://hollo/image/headers/original/missing.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 0,
"moved": null,
"last_status_at": null,
"emojis": [],
"fields": []
},
"media_attachments": [],
"mentions": [],
"tags": [],
"card": null,
"emojis": [],
"emoji_reactions": [],
"poll": null,
"filtered": null
}
Example 3¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/activity/3_t-3RZTsAk",
"published": "2025-08-30T19:06:57Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/object/jw76NJp4Tjg",
"published": "2025-08-30T19:06:57Z",
"content": "no type \u26a0\ufe0f ",
"tag": [
{
"name": "#test"
},
{
"type": "Mention",
"href": "http://hollo/@john"
}
]
}
}
hollo
{
"id": "0198fc60-2868-7913-b5c1-a1e354222336",
"created_at": "2025-08-30T19:06:57.000Z",
"in_reply_to_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/object/jw76NJp4Tjg",
"url": "http://pasture-one-actor/object/jw76NJp4Tjg",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "no type \u26a0\ufe0f ",
"reblog": null,
"quote_id": null,
"quote": null,
"application": null,
"account": {
"id": "0198fc5f-fd5f-7ea5-832e-88a2cd8e53de",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": false,
"bot": false,
"created_at": "2025-08-30T19:06:45.932Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://hollo/image/avatars/original/missing.png",
"avatar_static": "http://hollo/image/avatars/original/missing.png",
"header": "http://hollo/image/headers/original/missing.png",
"header_static": "http://hollo/image/headers/original/missing.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 0,
"moved": null,
"last_status_at": null,
"emojis": [],
"fields": []
},
"media_attachments": [],
"mentions": [],
"tags": [],
"card": null,
"emojis": [],
"emoji_reactions": [],
"poll": null,
"filtered": null
}
Example 4¶
activity
{
"@context": "https://www.w3.org/ns/activitystreams",
"type": "Create",
"actor": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/activity/XMnC4o5vHcY",
"published": "2025-08-30T19:06:58Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/object/KsUnE5ICVDk",
"published": "2025-08-30T19:06:58Z",
"@context": "https://www.w3.org/ns/activitystreams",
"content": "Hashtag not in @context \u26a0\ufe0f ",
"tag": [
{
"type": "Hashtag",
"name": "#test"
},
{
"type": "Mention",
"href": "http://hollo/@john"
}
]
}
}
hollo
{
"id": "0198fc60-2c50-7d03-84a1-c84af32ca21b",
"created_at": "2025-08-30T19:06:58.000Z",
"in_reply_to_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/object/KsUnE5ICVDk",
"url": "http://pasture-one-actor/object/KsUnE5ICVDk",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "Hashtag not in @context \u26a0\ufe0f ",
"reblog": null,
"quote_id": null,
"quote": null,
"application": null,
"account": {
"id": "0198fc5f-fd5f-7ea5-832e-88a2cd8e53de",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": false,
"bot": false,
"created_at": "2025-08-30T19:06:45.932Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://hollo/image/avatars/original/missing.png",
"avatar_static": "http://hollo/image/avatars/original/missing.png",
"header": "http://hollo/image/headers/original/missing.png",
"header_static": "http://hollo/image/headers/original/missing.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 0,
"moved": null,
"last_status_at": null,
"emojis": [],
"fields": []
},
"media_attachments": [],
"mentions": [],
"tags": [],
"card": null,
"emojis": [],
"emoji_reactions": [],
"poll": null,
"filtered": null
}
Example 5¶
activity
{
"@context": "https://www.w3.org/ns/activitystreams",
"type": "Create",
"actor": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/activity/bXwgJNjHKhc",
"published": "2025-08-30T19:06:58Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://hollo/@john"
],
"id": "http://pasture-one-actor/object/QbJ0WpKsqx4",
"published": "2025-08-30T19:06:58Z",
"@context": "https://www.w3.org/ns/activitystreams",
"content": "Hashtag not in @context; as:Hashtag",
"tag": [
{
"type": "as:Hashtag",
"name": "#test"
},
{
"type": "Mention",
"href": "http://hollo/@john"
}
]
}
}
hollo
{
"id": "0198fc60-2c50-7d03-84a1-c84bba49daca",
"created_at": "2025-08-30T19:06:58.000Z",
"in_reply_to_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/object/QbJ0WpKsqx4",
"url": "http://pasture-one-actor/object/QbJ0WpKsqx4",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "Hashtag not in @context; as:Hashtag",
"reblog": null,
"quote_id": null,
"quote": null,
"application": null,
"account": {
"id": "0198fc5f-fd5f-7ea5-832e-88a2cd8e53de",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": false,
"bot": false,
"created_at": "2025-08-30T19:06:45.932Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://hollo/image/avatars/original/missing.png",
"avatar_static": "http://hollo/image/avatars/original/missing.png",
"header": "http://hollo/image/headers/original/missing.png",
"header_static": "http://hollo/image/headers/original/missing.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 0,
"moved": null,
"last_status_at": null,
"emojis": [],
"fields": []
},
"media_attachments": [],
"mentions": [],
"tags": [],
"card": null,
"emojis": [],
"emoji_reactions": [],
"poll": null,
"filtered": null
}