About XpressDevTools

A fast, private, no-nonsense collection of utilities for developers — built for the everyday rhythm of writing code.

Why we built this

Every developer ends up googling the same five things: format this JSON, decode this Base64, validate this JWT, build that regex, generate a UUID, convert that timestamp. The web is littered with sites that do these things — and most of them are slow, ad-heavy, cluttered, or worse, send your data to a server you've never heard of.

XpressDevTools is different. Every tool here runs entirely in your browser. The server only ships a Razor-rendered HTML page and a small JavaScript file. There is no upload, no API call, no analytics on your inputs. Close the tab and there is nothing left behind.

How it works

The site is an ASP.NET Core 9 application that renders simple HTML — but the actual logic for every tool is vanilla JavaScript running on your device. Heavy operations (large regex matches, file hashing) use Web Workers so the UI stays responsive.

What's here today

• JSON formatter, validator and viewer
• Base64 encoder / decoder with file support
• URL encoder, decoder and parser
• UUID v4 and v7 generator
• Regex tester with live highlighting
• JWT decoder
• Unix timestamp converter
• MD5 / SHA hash generator

What's next

More tools — colour pickers, CSV/JSON conversion, cron parsers, diff viewers. Got something specific you want? The codebase is small, the bar is "useful and fast".