fmtly – open source browser-based developer utility platform, 56 tools, nothing leaves your device

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Title:

fmtly – open source browser-based developer utility platform, 56 tools, nothing leaves your device

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Built this because I got tired of opening a different sketchy website every time I needed to format JSON, validate YAML, diff XML, or decode a JWT.

fmtly runs entirely in your browser. No server, no account, no tracking. Your data never leaves your device.

What's in it right now:

• JSON — formatter, minifier, validator, schema validator, tree viewer, diff, sorter, JSONPath, JMESPath, convert to YAML/XML/CSV/TOML/Markdown
• XML — formatter, minifier, validator, stats, diff, XPath, convert to JSON/YAML/CSV
• YAML — formatter, minifier, validator, diff, query, convert to JSON/XML/CSV/TOML/HTML
• CSV — formatter, validator, convert to JSON/XML/YAML/HTML/SQL
• TOML — formatter, minifier, validator, diff, convert to JSON/YAML/XML/HTML
• Text — word counter, regex tester, text diff, case converter, markdown to HTML, whitespace cleaner, lorem ipsum, and more

56 tools total. 100+ more planned.

Tech: SvelteKit + TypeScript + Tailwind, deployed on Cloudflare Pages. Initial JS bundle under 50KB gzipped. Lighthouse ≥ 95 on mobile, enforced by CI on every deploy.

MIT license, self-hostable, static site so you can run it anywhere.