John Whiteside
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whiteside.io
John Whiteside
@whiteside.io
420 followers 380 following 1.1K posts
Building AT Explore — tinkering with the AT Protocol
👨🏻‍💻 Software Engineer | 🍕 Pizza Connoisseur
📍 Flint, Michigan

Dev: @johnwhiteside.dev
Updates: @now.whiteside.io
Signal: whiteside.io/signal

atexplore.social • whiteside.io
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whiteside.io
I’m adding engagement numbers via back links to posts on @atexplore.social. I just need to link this into the actual records and do some more testing.
November 8, 2025 at 4:12 PM
whiteside.io
Something kinda fun I’ve been playing around with, I created an MCP that can talk to @atexplore.social , and I’ve been using it when I need some context on real data from the protocol. It’s not quite stable yet, but just something I’ve been experimenting with.
November 6, 2025 at 2:53 AM
whiteside.io
Still some more cleanup to do, but backlinks on @atexplore.social are close!
October 30, 2025 at 1:34 AM
whiteside.io
Go Blue!
Large yellow block letter M with the word “MICHIGAN” in bold yellow capital letters below it on a dark blue background, representing the University of Michigan logo.
October 26, 2025 at 3:26 AM
whiteside.io
Somebody doesn’t want me working on the laptop today.
A gray tabby kitten with dark stripes lies on a person’s lap beside an open laptop keyboard, stretching one paw across the edge while looking directly at the camera. A living room with a TV, a shelf, and trophies is visible in the background.
October 19, 2025 at 8:51 PM
whiteside.io
Sad day 😔
A large above-ground swimming pool is covered with a black tarp secured by sandbags, surrounded by a white fence and a wooden deck, with trees and a cloudy sky in the background.
October 18, 2025 at 6:05 PM
whiteside.io
I haven’t fully tested this one yet, but working on adding Lexicon schema support on @atexplore.social. This should make it a little easier to look at schemas.
October 16, 2025 at 11:50 PM
whiteside.io
Made some small changes to @leaflet.pub Subscription and Publication support in @atexplore.social. Both should be ready to go now. Just finished comments this evening.
October 14, 2025 at 12:53 AM
whiteside.io
There’s still some more cleanup to do, but working on expanding @leaflet.pub support on @atexplore.social to publications and subscriptions. Doing comments next then starting on Tangled.
October 9, 2025 at 12:50 AM
whiteside.io
It’s October in Michigan, and I haven’t closed it yet. Crazy…
A round above-ground swimming pool with clear blue water reflects sunlight, creating rippling patterns. White metal railings surround the pool, with trees, power lines, and a few buildings visible in the background under a mostly clear sky.
October 6, 2025 at 4:07 PM
whiteside.io
85 degrees in Michigan in October is crazy.
Weather forecast for Flint shows it is sunny at 84°F, with a high of 85°F and a low of 48°F. The forecast indicates sunny conditions through 7 PM, with temperatures gradually dropping from 84°F to 83°F and wind gusts up to 10 mph.
October 3, 2025 at 6:36 PM
whiteside.io
Stoked to play this!
Nintendo Switch game cover showing Super Mario Galaxy and Super Mario Galaxy 2. Mario is floating in space with Luma characters, and in the lower section he rides Yoshi while planets and other characters appear in the background. The cover has a diagonal space divide and an ESRB E for Everyone rating.
October 3, 2025 at 1:46 AM
whiteside.io
I’ve been playing around with how I want to link AT Protocol and ActivityPub data on @atexplore.social. Here’s one example, clicking into an ActivityPub profile from a profile bridged by BridgyFed.
October 2, 2025 at 1:10 PM
whiteside.io
One of my favorite pizzas. #pizzasky 🍕
📍Mario’s Pizza, Flint, MI
A large baked pizza with a thin crust, topped with pepperoni, crumbled sausage, ground beef, bacon bits, green bell peppers, red onions, and melted cheese on a tomato sauce base, served on a metal pizza stand.
October 2, 2025 at 12:13 AM
whiteside.io
It’s not quite ready yet, but here’s the first look at ActivityPub profiles on @atexplore.social.
A screenshot of a profile page on ATExplore beta showing a Mastodon user. The top has a search bar, and below is a banner image of a laptop with code on its screen, surrounded by gears, code symbols, and a coffee cup. The profile belongs to John Whiteside, a bearded man in sunglasses, labeled as a software engineer from Michigan who joined February 1, 2023. Buttons for “SIGNED IDENTITY” and “RICH CONTENT” are visible at the bottom.
September 30, 2025 at 10:45 PM
whiteside.io
Stopped by Tahquamenon Falls before heading back home today. #puremichigan
A wide waterfall cascades over a rocky ledge surrounded by dense green forest with some trees showing early autumn colors under a clear sky. A calm river with small green islands and bushes reflects the blue sky and nearby trees, with sunlight sparkling on the water’s surface.
September 29, 2025 at 3:26 AM
whiteside.io
Good morning!
Sunlight reflects off calm ocean water as seen from a balcony overlooking a sandy beach with scattered lounge chairs and a few distant islands on the horizon.
September 28, 2025 at 12:17 PM
whiteside.io
I found pizza! 🍕 #pizzasky
A round pepperoni pizza with melted cheese sits in a black pan on a table, surrounded by baskets of breadsticks, dipping sauces, and wings in checkered paper trays.
September 27, 2025 at 8:32 PM
whiteside.io
Good morning from St. Ignace, MI!
A laptop displaying code sits on a balcony overlooking a sandy beach with green chairs and a calm, gray ocean under an overcast sky.
September 27, 2025 at 1:42 PM
whiteside.io
Adding this to my todos for @atexplore.social. This will be interesting just because it’s a completely different data type.
A task card titled "Investigate Tangled Lexicon support" shows a large green check icon at the top. Below, it lists details: Assignee is empty, Status is marked "Not started," and Due date is empty.
September 25, 2025 at 3:49 PM
whiteside.io
Leaflet support on @atexplore.social is close! Mostly just some code cleanup to remaining.
September 20, 2025 at 2:10 AM
whiteside.io
Something I’m experimenting with for @atexplore.social. AP Explore?
A mobile interface shows a GitHub pull request titled “ActivityPub Endpoints” in the repository johnwhiteside/at-explore. It is open and merges the feature/activity-pub-endpoints branch into main. The description by johnwhiteside explains adding ActivityPub TypeScript interfaces, a new ActivityPubService, and API endpoints for profiles and posts. Below, a section labeled Changes notes 12 files changed, with buttons for comments and navigation tabs at the bottom of the screen.
September 20, 2025 at 12:43 AM
whiteside.io
Still a work in progress, but I’m working on adding support for @leaflet.pub records to @atexplore.social.
A dark-themed interface of ATExplore Beta is shown, with a search bar at the top and two posts by Anuj Ahooja (@quillmatiq.com). The second post, dated Sep 3, discusses a problem with lexicon alignment across platforms and includes a highlighted quote about fragmented communities on apps like BookHive and Popfeed.
September 16, 2025 at 10:54 PM
whiteside.io
Let’s go Lions!
The Detroit Lions logo, featuring a blue, roaring lion in mid-leap outlined in silver, set against a solid blue background.
September 7, 2025 at 9:06 PM
whiteside.io
Fire night 🔥
September 7, 2025 at 1:24 AM