ActivityPub Viewer

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.

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{ "@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" } ], "id": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393", "type": "Note", "summary": null, "inReplyTo": "https://mastodon.online/users/KilleansRow/statuses/114266367157114219", "published": "2025-04-04T15:58:41Z", "url": "https://mastodon.online/@ThreeSigma/114280518249920393", "attributedTo": "https://mastodon.online/users/ThreeSigma", "to": [ "https://www.w3.org/ns/activitystreams#Public" ], "cc": [ "https://mastodon.online/users/ThreeSigma/followers", "https://mastodon.online/users/KilleansRow" ], "sensitive": false, "atomUri": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393", "inReplyToAtomUri": "https://mastodon.online/users/KilleansRow/statuses/114266367157114219", "conversation": "tag:mastodon.online,2025-03-31:objectId=485431063:objectType=Conversation", "content": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://mastodon.online/@KilleansRow\" class=\"u-url mention\">@<span>KilleansRow</span></a></span> <br />If it&#39;s not tested with experiment, then the theory isn&#39;t even wrong, it&#39;s pointless. Observations are fine (providing it&#39;s predicting, not post-hoc), but you need to be dealing with physical reality, not just principles and math.</p><p>If you can&#39;t build the experiment, there&#39;s little point in building the theory.</p>", "contentMap": { "en": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://mastodon.online/@KilleansRow\" class=\"u-url mention\">@<span>KilleansRow</span></a></span> <br />If it&#39;s not tested with experiment, then the theory isn&#39;t even wrong, it&#39;s pointless. Observations are fine (providing it&#39;s predicting, not post-hoc), but you need to be dealing with physical reality, not just principles and math.</p><p>If you can&#39;t build the experiment, there&#39;s little point in building the theory.</p>" }, "attachment": [], "tag": [ { "type": "Mention", "href": "https://mastodon.online/users/KilleansRow", "name": "@KilleansRow" } ], "replies": { "id": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393/replies", "type": "Collection", "first": { "type": "CollectionPage", "next": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393/replies?only_other_accounts=true&page=true", "partOf": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393/replies", "items": [] } }, "likes": { "id": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393/likes", "type": "Collection", "totalItems": 0 }, "shares": { "id": "https://mastodon.online/users/ThreeSigma/statuses/114280518249920393/shares", "type": "Collection", "totalItems": 0 } }