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",
"Hashtag": "as:Hashtag"
}
],
"id": "https://mstdn.science/users/QNFO/statuses/114747633843024149",
"type": "Note",
"summary": null,
"inReplyTo": null,
"published": "2025-06-26T03:52:20Z",
"url": "https://mstdn.science/@QNFO/114747633843024149",
"attributedTo": "https://mstdn.science/users/QNFO",
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"cc": [
"https://mstdn.science/users/QNFO/followers"
],
"sensitive": false,
"atomUri": "https://mstdn.science/users/QNFO/statuses/114747633843024149",
"inReplyToAtomUri": null,
"conversation": "tag:mstdn.science,2025-06-26:objectId=94949222:objectType=Conversation",
"content": "<p>2(pi)f = m</p><p>Derived from:</p><p>E = mc^2<br />E = hf<br />Therefore, hf = mc^2</p><p>To simplify and avoid precision/rounding errors, we adopt natural units.</p><p>In units where c=1 and h_bar=1:<br />h_bar = h / 2(pi) (reduced Planck constant)<br />Since h_bar = 1, h = 2(pi)</p><p>Substitute h=2(pi) and c=1 into hf = mc^2:<br />2(pi)f = m(1)^2<br />2(pi)f = m</p><p>In this system, energy also simplifies to E=m and E=2(pi)f</p><p><a href=\"https://mstdn.science/tags/physics\" class=\"mention hashtag\" rel=\"tag\">#<span>physics</span></a> <a href=\"https://mstdn.science/tags/science\" class=\"mention hashtag\" rel=\"tag\">#<span>science</span></a> <a href=\"https://mstdn.science/tags/math\" class=\"mention hashtag\" rel=\"tag\">#<span>math</span></a> <a href=\"https://mstdn.science/tags/space\" class=\"mention hashtag\" rel=\"tag\">#<span>space</span></a> <a href=\"https://mstdn.science/tags/nature\" class=\"mention hashtag\" rel=\"tag\">#<span>nature</span></a></p>",
"contentMap": {
"en": "<p>2(pi)f = m</p><p>Derived from:</p><p>E = mc^2<br />E = hf<br />Therefore, hf = mc^2</p><p>To simplify and avoid precision/rounding errors, we adopt natural units.</p><p>In units where c=1 and h_bar=1:<br />h_bar = h / 2(pi) (reduced Planck constant)<br />Since h_bar = 1, h = 2(pi)</p><p>Substitute h=2(pi) and c=1 into hf = mc^2:<br />2(pi)f = m(1)^2<br />2(pi)f = m</p><p>In this system, energy also simplifies to E=m and E=2(pi)f</p><p><a href=\"https://mstdn.science/tags/physics\" class=\"mention hashtag\" rel=\"tag\">#<span>physics</span></a> <a href=\"https://mstdn.science/tags/science\" class=\"mention hashtag\" rel=\"tag\">#<span>science</span></a> <a href=\"https://mstdn.science/tags/math\" class=\"mention hashtag\" rel=\"tag\">#<span>math</span></a> <a href=\"https://mstdn.science/tags/space\" class=\"mention hashtag\" rel=\"tag\">#<span>space</span></a> <a href=\"https://mstdn.science/tags/nature\" class=\"mention hashtag\" rel=\"tag\">#<span>nature</span></a></p>"
},
"attachment": [],
"tag": [
{
"type": "Hashtag",
"href": "https://mstdn.science/tags/physics",
"name": "#physics"
},
{
"type": "Hashtag",
"href": "https://mstdn.science/tags/Science",
"name": "#Science"
},
{
"type": "Hashtag",
"href": "https://mstdn.science/tags/math",
"name": "#math"
},
{
"type": "Hashtag",
"href": "https://mstdn.science/tags/Space",
"name": "#Space"
},
{
"type": "Hashtag",
"href": "https://mstdn.science/tags/nature",
"name": "#nature"
}
],
"replies": {
"id": "https://mstdn.science/users/QNFO/statuses/114747633843024149/replies",
"type": "Collection",
"first": {
"type": "CollectionPage",
"next": "https://mstdn.science/users/QNFO/statuses/114747633843024149/replies?min_id=114747709842565183&page=true",
"partOf": "https://mstdn.science/users/QNFO/statuses/114747633843024149/replies",
"items": [
"https://mstdn.science/users/QNFO/statuses/114747709842565183"
]
}
},
"likes": {
"id": "https://mstdn.science/users/QNFO/statuses/114747633843024149/likes",
"type": "Collection",
"totalItems": 0
},
"shares": {
"id": "https://mstdn.science/users/QNFO/statuses/114747633843024149/shares",
"type": "Collection",
"totalItems": 3
}
}