Coding how-tos, kept short

Advanced DOT in the browser: rankdir and rank=same for layers, clusters for grouping services, edge styles for sync vs async, and a full three-tier diagram built in three steps.

Every app has a Send button and a shared bank behind it — how items route by kind, what the desktop does with a dropped file, and three real pipelines end to end.

Verifying downloads, checking webhook signatures, reading a JWT honestly, and the entropy math behind a good passphrase — with the Crypto & Hash app as the workbench.

The directives that must ride along with proxy_pass — WebSocket upgrade, the forwarded headers — plus the cache split that keeps a deploy from serving stale pages.

A real CPython interpreter in the browser via Pyodide — a working snippet, when a browser REPL is the right tool, and how the sandbox actually protects you.

A production service unit built up in stages — restart policy that can't loop itself into lockout, resource guards, the sandboxing block, and why enable sometimes silently does nothing.

Build a pattern against real text, read the capture groups, preview a find-and-replace with back-references, and sidestep the greedy-versus-lazy traps.

Error budgets, why p99 is the number users feel, backoff with jitter, and n+1 capacity math — the small calculations behind reliable services, with the tools that do them.

Dedup with ROW_NUMBER, top-N per group, LAG for deltas, moving averages with frame clauses, NTILE buckets and a recursive CTE to fill date gaps — real SQLite, no upload.

AVIF, WebP and MozJPEG at a quality you cannot tell apart from the original — a real before-and-after size story, done entirely on your machine.

Import a CSV, then answer questions with GROUP BY, a JOIN and a window function — against real SQLite compiled to WebAssembly, with nothing uploaded.

The everyday format shuffle — JSON to YAML for a CI file, TOML to JSON to inspect it — done locally, with the traps each format hides called out.

Eight synthesized voices, sixteen steps, and a look-ahead scheduler that keeps the timing tight — then render the loop to a real WAV, all client-side.

Weight class, embedding permission, x-height, and which scripts it actually covers — parsed straight from the file, so you know what you're shipping.