I built LogSieve as a small experiment: Can I build a small, completely client side application to parse and visualize logs.

It turns out the answer is Yes.

Drag and drop a .log or .txt file into the page, and it parses, filters, and visualizes entirely in your browser — no server, no upload, no dependencies. It supports text and regex filters, named-group field extraction, sorting, summary stats, and JSON/CSV export.

You can open it directly on GitHub Pages or just clone the repo and double-click it. Source: https://github.com/notesofcliff/logsieve

Built as a "one-problem" weekend project — it’s basically "just" 900 lines of HTML, CSS, and JS.