A small tool to view real-world ActivityPub objects as JSON! Enter a URL
or username from Mastodon or a similar service below, and we'll send a
request with
the right
Accept
header
to the server to view the underlying object.
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"ostatus": "http://ostatus.org#",
"atomUri": "ostatus:atomUri",
"inReplyToAtomUri": "ostatus:inReplyToAtomUri",
"conversation": "ostatus:conversation",
"sensitive": "as:sensitive",
"toot": "http://joinmastodon.org/ns#",
"votersCount": "toot:votersCount",
"blurhash": "toot:blurhash",
"focalPoint": {
"@container": "@list",
"@id": "toot:focalPoint"
},
"Hashtag": "as:Hashtag"
}
],
"id": "https://mastodon.social/users/rperezrosario/statuses/114697214373962096",
"type": "Note",
"summary": null,
"inReplyTo": null,
"published": "2025-06-17T06:10:00Z",
"url": "https://mastodon.social/@rperezrosario/114697214373962096",
"attributedTo": "https://mastodon.social/users/rperezrosario",
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"cc": [
"https://mastodon.social/users/rperezrosario/followers"
],
"sensitive": false,
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"conversation": "tag:mastodon.social,2025-06-17:objectId=1025130058:objectType=Conversation",
"content": "<p>InfoWorld contributor Joydip Kanjilal reviews a group of read-only data structures in .NET Core that are optimized to allow very fast thread-safe reads over their data in comparison to plain dictionaries, lists, and hash sets.</p><p>Namely: FrozenSet and FrozenDictionary.</p><p>He also shows benchmark results, and includes a tutorial written in C#. </p><p>"How to use frozen collections in C#" </p><p><a href=\"https://www.infoworld.com/article/4000458/how-to-work-with-frozen-collections-in-c-sharp.html\" target=\"_blank\" rel=\"nofollow noopener\" translate=\"no\"><span class=\"invisible\">https://www.</span><span class=\"ellipsis\">infoworld.com/article/4000458/</span><span class=\"invisible\">how-to-work-with-frozen-collections-in-c-sharp.html</span></a></p><p><a href=\"https://mastodon.social/tags/programming\" class=\"mention hashtag\" rel=\"tag\">#<span>programming</span></a> <a href=\"https://mastodon.social/tags/csharp\" class=\"mention hashtag\" rel=\"tag\">#<span>csharp</span></a> <a href=\"https://mastodon.social/tags/datastructures\" class=\"mention hashtag\" rel=\"tag\">#<span>datastructures</span></a> <a href=\"https://mastodon.social/tags/optimization\" class=\"mention hashtag\" rel=\"tag\">#<span>optimization</span></a> <a href=\"https://mastodon.social/tags/dotnetcore\" class=\"mention hashtag\" rel=\"tag\">#<span>dotnetcore</span></a></p>",
"contentMap": {
"en": "<p>InfoWorld contributor Joydip Kanjilal reviews a group of read-only data structures in .NET Core that are optimized to allow very fast thread-safe reads over their data in comparison to plain dictionaries, lists, and hash sets.</p><p>Namely: FrozenSet and FrozenDictionary.</p><p>He also shows benchmark results, and includes a tutorial written in C#. </p><p>"How to use frozen collections in C#" </p><p><a href=\"https://www.infoworld.com/article/4000458/how-to-work-with-frozen-collections-in-c-sharp.html\" target=\"_blank\" rel=\"nofollow noopener\" translate=\"no\"><span class=\"invisible\">https://www.</span><span class=\"ellipsis\">infoworld.com/article/4000458/</span><span class=\"invisible\">how-to-work-with-frozen-collections-in-c-sharp.html</span></a></p><p><a href=\"https://mastodon.social/tags/programming\" class=\"mention hashtag\" rel=\"tag\">#<span>programming</span></a> <a href=\"https://mastodon.social/tags/csharp\" class=\"mention hashtag\" rel=\"tag\">#<span>csharp</span></a> <a href=\"https://mastodon.social/tags/datastructures\" class=\"mention hashtag\" rel=\"tag\">#<span>datastructures</span></a> <a href=\"https://mastodon.social/tags/optimization\" class=\"mention hashtag\" rel=\"tag\">#<span>optimization</span></a> <a href=\"https://mastodon.social/tags/dotnetcore\" class=\"mention hashtag\" rel=\"tag\">#<span>dotnetcore</span></a></p>"
},
"updated": "2025-06-17T06:18:24Z",
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{
"type": "Document",
"mediaType": "image/jpeg",
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"name": null,
"blurhash": "UFJuAaj[RjM{?bt7_3-;~qof-;xu~qM{t7M{",
"width": 1024,
"height": 1024
}
],
"tag": [
{
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"href": "https://mastodon.social/tags/dotnetcore",
"name": "#dotnetcore"
},
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/programming",
"name": "#programming"
},
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/csharp",
"name": "#csharp"
},
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/datastructures",
"name": "#datastructures"
},
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/optimization",
"name": "#optimization"
}
],
"replies": {
"id": "https://mastodon.social/users/rperezrosario/statuses/114697214373962096/replies",
"type": "Collection",
"first": {
"type": "CollectionPage",
"next": "https://mastodon.social/users/rperezrosario/statuses/114697214373962096/replies?only_other_accounts=true&page=true",
"partOf": "https://mastodon.social/users/rperezrosario/statuses/114697214373962096/replies",
"items": []
}
},
"likes": {
"id": "https://mastodon.social/users/rperezrosario/statuses/114697214373962096/likes",
"type": "Collection",
"totalItems": 1
},
"shares": {
"id": "https://mastodon.social/users/rperezrosario/statuses/114697214373962096/shares",
"type": "Collection",
"totalItems": 2
}
}