Blog
Notes on web utilities, scripting recipes, and tools we build at utilrepo.
- Developer
Reading the AWS Cost Explorer CSV: a field-by-field guide
What every column in an AWS Cost Explorer CSV export actually means, the schema gotchas that bite first-time readers, and how to slice the file for the answers you usually want.
- Developer
Seven AWS cost-management pitfalls common at Japanese enterprises
Approval workflows, fiscal-year budgets, tagging discipline, and FX risk — the organizational realities that shape AWS cost work at Japanese corporations, and how to navigate them.
- Developer
JWT signing algorithms compared: HS256, RS256, ES256, EdDSA
The trade-offs between the four JWT signing algorithms that matter in 2026, what each one means for key distribution, and the algorithm-confusion attacks that still appear in real systems.
- Developer
Welcome to the utilrepo blog
A short note on what this blog is, who it is for, and what we plan to write about.
- Developer
Why your AWS bill suddenly spikes — 7 common causes
The seven shapes an unexpected AWS cost increase takes, what each one looks like in Cost Explorer, and how to track them down before they recur.