How to Build a Zero-Knowledge AI Prompt Anonymizer in Pure JavaScript (Two-Way PII Masking)
javascript
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Every day, developers, lawyers, and founders paste confidential source code, customer records, and internal business metrics directly into ChatGPT, Claude, and Gemini. When you paste raw client data like "Sarah Jenkins from TechNova GmbH paid $45,000" into public LLM chats, that private information is sent across the internet, logged into provider telemetry databases, and potentially used to retrain future AI models. In this guide, we will build a 100% client-side, zero-knowledge AI prompt san