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",
"https://w3id.org/security/v1",
{
"mostr": "http://mostr.pub/ns#",
"Zap": "mostr:Zap",
"xsd": "http://www.w3.org/2001/XMLSchema#",
"fep": "https://w3id.org/fep/",
"proxyOf": {
"@id": "fep:fffd/proxyOf",
"@type": "@id",
"@container": "@set"
},
"protocol": {
"@id": "fep:fffd/protocol",
"@type": "@id"
},
"proxied": {
"@id": "fep:fffd/proxied",
"@type": "xsd:string"
},
"authoritative": {
"@id": "fep:fffd/authoritative",
"@type": "xsd:boolean"
}
}
],
"type": "Person",
"id": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c",
"name": "Superman (2025)",
"preferredUsername": "08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c",
"inbox": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c/inbox",
"followers": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c/followers",
"following": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c/following",
"outbox": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c/outbox",
"summary": "July 11, 2025:\n\"Superman embarks on a journey to reconcile his Kryptonian heritage with his human upbringing as Clark Kent.\"",
"attachment": [
{
"type": "PropertyValue",
"name": "",
"value": ""
}
],
"tag": [],
"publicKey": {
"id": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c#main-key",
"owner": "https://mostr.pub/users/08d1bca6bd53b0ed0fe49669c3e942e68dbc150d18fdfd17cd4d3a630798a75c",
"publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtv2I1a22QzTC8MZxDQy1AaCPmdf9HxHVEgclmc9Z3OXVQoJQbO1tmZuOAd3RpmR2Xui3CICtz36YDwdfVNmqUZZlWu3D/7Jus8wHMtvxxxOwKfObjuDgjxMIIhyxM2AQEskHo6GOyxP+0/7RPzjfw9J66FeTR8MPSNWH40ELLCDS6nyNUHMg2bQkvymQD7lXhS1DSJEqZuHhUr0Gm0Cm2EK/sGib1CM13l65Ao0peMrrnnX6Qwzh3dBTDPwwDcl0z4uXX5XZv21LoFtv76zIGCFfKMFQecwq82eaMxMBZfatVo02P+CdISNefrka0X62hOS99GV9CpVbG0/0p01GvQIDAQAB\n-----END PUBLIC KEY-----"
},
"endpoints": {
"sharedInbox": "https://mostr.pub/inbox"
},
"proxyOf": [
{
"protocol": "https://github.com/nostr-protocol/nostr",
"proxied": "npub1prgmef4a2wcw6rlyje5u862zu6xmc9gdrr7l697df5axxpuc5awqgqy0fm",
"authoritative": true
}
]
}