I built a zero-log PII redaction API – no AI, just regex and checksums

Show HN: I built a zero-log PII redaction API – no AI, just regex and checksums

I built a zero-log PII redaction API – no AI, just regex and checksums operates in show hn launch.

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Hi HN,I built PII Firewall because I got tired of watching "privacy" APIs secretly pipe user data to cloud AI models. If you're using GPT/Claude to redact PII, you're literally giving the AI your PII.What makes this different:- Zero AI – deterministic regex + 30 checksum validators (Luhn, Verhoeff, Mod 11/97) - Zero storage – processes on Cloudflare edge, no logs, no persistence - 152 PII types – SSN, Aadhaar, 50+ country IDs, 20 API key formats, crypto wallets - Two modes: `/fast` (2-5ms) for structured PII, `/deep` (5-15ms) adds names/addresses via 2000+ name gazetteerThe technical approach:Instead of ML inference, I use combined V8-optimized regex with heuristic pre-scanning. Clean text (

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Website: pii-firewall-edge-web.vercel.app