postjson.com — A web dev tool with macOS-inspired UI paradigm

https://postjson.com
A lot of browser-based developer utilities look like generic web pages.
postjson.com follows the layout and interaction paradigm of classic macOS native apps, rather than copying keyboard shortcuts.
If you’re used to the rhythm of small Mac utilities: split panes, sidebar navigation, clean separation between input and output, uncluttered chrome, it will feel instantly familiar.
There’s no bloated dashboard, no giant top navigation bars, no overly decorated card layout.
It adopts the traditional macOS utility pattern:
Left sidebar for tool list
Main view split into input panel and result panel
Focus stays on your data, with minimal visual noise
Switching between different tools feels like switching between tabs in a lightweight Mac utility
Under the hood, it’s an all‑in-one client-side developer toolkit centered around JSON processing.
What you can do with it:
Prettify, validate and minify JSON
Convert JSON directly to Go, TypeScript, Rust structs
Timestamp and timezone conversion
Base64, URL, Unicode encode/decode
Bulk UUID generation
SSL inspection, user-agent parsing
Code minification, Markdown preview and more
Everything runs locally in your browser. No login required, no ads, no data sent to remote servers.
It does not replicate macOS keyboard shortcuts.
The resemblance comes purely from the desktop‑app‑style layout and separation of concerns — the same visual language you see in many lightweight Mac apps.
I’ve been using it instead of juggling a dozen separate bookmarked tools.
If you like that restrained, utility-first macOS aesthetic, give it a try.
🔗 https://postjson.com