Guides, tips and explanations
A technical deep dive into CRC32, Adler-32, and SHA — not just what they are, but the specific engineering situations where each one belongs, why picking the wrong one creates rea…
Read more →A practical Q&A covering the real questions backend developers face when building API key systems — from why Math.random() is dangerous and how CSPRNGs work, to key length, prefix…
Read more →Seven subtle .env file bugs — from unquoted values and CRLF endings to duplicate keys and multiline private keys — that silently break CI pipelines, with exact fixes for each one.
Read more →SemVer range operators — ^, ~, and >= — are precise resolver instructions, not punctuation noise. This guide unpacks exactly what each one permits, how npm and friends resolve dep…
Read more →Cron expressions look like noise until someone walks you through each of the five fields. This guide breaks down every slot with real examples, explains the sneaky OR behavior bet…
Read more →Hashing and encryption aren't the same thing — and the security bugs that come from confusing them are entirely preventable. This breakdown explains why one-way matters, what each…
Read more →SHA-256 is fast — and that's exactly why it's wrong for passwords. Learn how bcrypt's cost factor and automatic salting protect your users, with plain-English explanations and rea…
Read more →A practical, platform-specific guide to computing and comparing SHA-256 checksums on macOS, Linux, and Windows — with one-liner commands, a reusable shell function, and clear advi…
Read more →UUID v4's full randomness fragments B-tree indexes, causing constant cache misses and page splits that hammer insert throughput at scale. UUID v7 fixes this with a millisecond tim…
Read more →MD5 collisions are cheap and have been used in real-world malware. SHA-1 is expensive to break but broken. SHA-256 is the current baseline. Here's exactly where each algorithm sti…
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