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://mastodon.cloud/users/Changaco/statuses/114587497775374436/replies",
"type": "Collection",
"first": {
"id": "https://mastodon.cloud/users/Changaco/statuses/114587497775374436/replies?page=true",
"type": "CollectionPage",
"next": "https://mastodon.cloud/users/Changaco/statuses/114587497775374436/replies?only_other_accounts=true&page=true",
"partOf": "https://mastodon.cloud/users/Changaco/statuses/114587497775374436/replies",
"items": [
{
"id": "https://mastodon.cloud/users/Changaco/statuses/114591110882218815",
"type": "Note",
"summary": null,
"inReplyTo": "https://mastodon.cloud/users/Changaco/statuses/114587497775374436",
"published": "2025-05-29T12:26:29Z",
"url": "https://mastodon.cloud/@Changaco/114591110882218815",
"attributedTo": "https://mastodon.cloud/users/Changaco",
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"cc": [
"https://mastodon.cloud/users/Changaco/followers"
],
"sensitive": false,
"atomUri": "https://mastodon.cloud/users/Changaco/statuses/114591110882218815",
"inReplyToAtomUri": "https://mastodon.cloud/users/Changaco/statuses/114587497775374436",
"conversation": "tag:mastodon.cloud,2025-05-28:objectId=463012037:objectType=Conversation",
"content": "<p>Loading the entire <a href=\"https://mastodon.cloud/tags/Python\" class=\"mention hashtag\" rel=\"tag\">#<span>Python</span></a> 3.13 standard library on <a href=\"https://mastodon.cloud/tags/Linux\" class=\"mention hashtag\" rel=\"tag\">#<span>Linux</span></a> results in more than 36 megabytes of memory being allocated for more than 247 thousand objects.</p><p>Strings rank first in both number of instances (82 thousand) and memory usage (7.5 megabytes). 8.9% of those strings are duplicates of other strings, wasting 449 kilobytes of RAM.</p><p>Fun fact: the original <a href=\"https://mastodon.cloud/tags/Gameboy\" class=\"mention hashtag\" rel=\"tag\">#<span>Gameboy</span></a> used less than 4.2 megabytes of memory for an entire game (counting both ROM and RAM; numbers from Wikipedia).</p>",
"contentMap": {
"en": "<p>Loading the entire <a href=\"https://mastodon.cloud/tags/Python\" class=\"mention hashtag\" rel=\"tag\">#<span>Python</span></a> 3.13 standard library on <a href=\"https://mastodon.cloud/tags/Linux\" class=\"mention hashtag\" rel=\"tag\">#<span>Linux</span></a> results in more than 36 megabytes of memory being allocated for more than 247 thousand objects.</p><p>Strings rank first in both number of instances (82 thousand) and memory usage (7.5 megabytes). 8.9% of those strings are duplicates of other strings, wasting 449 kilobytes of RAM.</p><p>Fun fact: the original <a href=\"https://mastodon.cloud/tags/Gameboy\" class=\"mention hashtag\" rel=\"tag\">#<span>Gameboy</span></a> used less than 4.2 megabytes of memory for an entire game (counting both ROM and RAM; numbers from Wikipedia).</p>"
},
"attachment": [],
"tag": [
{
"type": "Hashtag",
"href": "https://mastodon.cloud/tags/python",
"name": "#python"
},
{
"type": "Hashtag",
"href": "https://mastodon.cloud/tags/linux",
"name": "#linux"
},
{
"type": "Hashtag",
"href": "https://mastodon.cloud/tags/gameboy",
"name": "#gameboy"
}
],
"replies": {
"id": "https://mastodon.cloud/users/Changaco/statuses/114591110882218815/replies",
"type": "Collection",
"first": {
"type": "CollectionPage",
"next": "https://mastodon.cloud/users/Changaco/statuses/114591110882218815/replies?only_other_accounts=true&page=true",
"partOf": "https://mastodon.cloud/users/Changaco/statuses/114591110882218815/replies",
"items": []
}
}
}
]
}
}