Welcome to the utilrepo blog
A short note on what this blog is, who it is for, and what we plan to write about.
This blog sits next to the tools at utilrepo.com. The tools answer short, one-shot questions — format this JSON, decode this JWT, convert this timestamp. The blog is for the longer-form material: why a regex assertion fires the way it does, where Vixie cron disagrees with POSIX, what the sequence of HTTP redirects in a single-page-app actually looks like.
What you can expect
The first posts will track the tools we have already built. Each new tool on utilrepo is here because we hit a friction point and wanted a smaller, faster alternative. The blog explains the friction:
- AWS billing analyzer — the seven shapes a cost spike takes and how to read a Cost Explorer CSV.
- JWT decoder — what each claim does, why signature verification has to live server-side, and the recipes for Cognito / Auth0 / Firebase tokens.
- HTTP status codes — the corners of RFC 9110 that actually matter for REST design, and the ones you can safely forget.
Posts will keep the same style as the tool body content: terse, structured, and honest about what the tool cannot do.
Languages
English is the seed language for every post. Japanese and Korean translations will follow when the topic is relevant to those audiences; when a translation is missing, the page falls back to English with a banner explaining what you are seeing. We do not run anything through machine translation — every locale is written or reviewed by hand.
Coming soon
The first batch of substantive posts is in the queue. If a specific question keeps biting your team, drop us a note — we read every message that comes through the contact channel on the about page.