SOSihwan Ohinwebtool-notes.hashnode.dev·1d ago · 7 min readTen Open-Data Portals, Ten Ways to List Their APIs: Notes From a Weekly CrawlAs of October 18, 2026 We are a small team that builds free web tools. One of them is an index of the APIs that national government open-data portals publish, one country per edition: Korea, Japan, th00
SOSihwan Ohinwebtool-notes.hashnode.dev·Oct 11 · 8 min readHow Big Is k? Measuring Have I Been Pwned's Range Buckets From NodeAs of October 9, 2026 "k-anonymity" gets attached to the Pwned Passwords range API in almost every write-up, usually without a value for k. If you are adding a breached-password check to a signup flow00
SOSihwan Ohinwebtool-notes.hashnode.dev·Oct 10 · 8 min readWhy the Same 45 Characters Make Three Different QR Codes: Encoding Modes as a Byte BudgetAs of October 9, 2026 Here is a puzzle any QR generator can produce: you change one word in a link and the code comes out visibly denser. Nothing is wrong with the generator. The payload crossed a cap00