Bantai is a powerful, type-safe policy evaluation library that enables you to build complex validation and decision-making logic using composable rules and policies. Built with TypeScript and Zod, it provides end-to-end type safety while remaining flexible enough to handle diverse use cases.

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Hey Product Hunt 👋 I’m the creator of Bantai — a TypeScript-first policy evaluation library for rule-based validation and decision-making. I built this after repeatedly needing a clean way to express rules and policies as code, without hard-wiring business logic all over services. Bantai focuses on: Strong TypeScript typing from context → rule → decision Composable, reusable policies (not just auth) Framework-agnostic usage (API, backend, edge, workers) Use cases like access control, rate limiting, feature gating, and validations It’s open source and still evolving, so feedback really matters 🙏 I’d love to hear: Where do you currently implement rules/decisions in your stack? What problems do existing policy engines not solve well for you? Happy to answer any questions — thanks for checking it out! 🚀

ElevenAgents by ElevenLabs — Scale conversations without scaling your team

Scale conversations without scaling your team

Bantai

TypeScript-first policy library for rule-based decisions

TypeScript-first policy library for rule-based decisions