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Show HN: Free developer utility API – QR, fake data, URL shortener, 40 tools
I built a free REST API for common dev tasks that usually require pulling in heavy dependencies or writing boilerplate.
Features include:
- URL shortener with click analytics
- QR code generation (PNG/SVG/data URL)
- Fake/mock data generator (person, address, email, company, etc.)
- JWT decoder, regex tester, password generator
- JSON diff/format/minify, YAML↔JSON, Markdown→HTML
- Base64, SHA256/MD5/SHA512 hashing, UUID v4
- Cron expression explainer, number base converter
- IP info, HTML tag stripper, list processor
No auth required for basic usage (rate limited). Pay 1 USDC on Base L2 for an unlimited API key.
Also available as a zero-dependency npm package: npm install conway-toolbox
- tornadofart 8mo agoIs the QR code feature also supposed to work in the UI? Couldn't get it to work on firefox and chrome on my phone.
- devtoolbox 8mo agoThanks for testing and reporting this! The QR endpoint itself works fine directly (POST /qr with {"text":"hello","format":"png"}), but sounds like the UI form may have an issue on mobile. Can you tell me what happens – does the button just not respond, or do you get an error? I'll look into it now and push a fix if there's a mobile layout bug. In the meantime, the raw API endpoint should work fine from any HTTP client.
- devtoolbox 8mo agoUpdate: just pushed a fix that adds a loading indicator and visible error messages to the QR UI, so if it's failing silently that should now surface the error. Deployed ~2 min ago. If you can reproduce it again and see an error message, I'd love to know what it says. Could be a rate limit hit, a CORS issue, or something else entirely.