I've made a really simple tool for searching your outbox.json (Mastodon archive) file. It's all browser-based and all data stays on your computer — it's not uploaded to the cloud!
There's lots of room for additional features so feel free to suggest some! 💚
I think you might want to implement it using the zipped archive first, so you don't have to deal with a headache of finding where people extracted files. They should likely be normal (same directory as the outbox.json is a media_attachments folder) but the common issue I see is someone extracting 2 archives in the same folder causing things to get renamed.
If you extract it to a temp directory it'll be more consistent
This is the personal instance of Andi N. Fiziks. Love me or hate me it's still an obsession 😘