About UsefulKey

UsefulKey is a self-hosted toolkit for API keys, scopes, usage limits, and rate limiting — designed to be simple to adopt and easy to extend.

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What is UsefulKey?

UsefulKey provides the building blocks for managing API access in your apps and services. It comes with storage adapters, middleware-friendly helpers, and pluggable features so you can choose only what you need.

  • Issue and verify API keys with optional expiration and metadata.
  • Apply global or token bucket rate limits backed by persistent stores.
  • Enable scopes, usage caps, and IP access control via plugins.
  • Use your preferred backend: Postgres, Redis, SQLite, Cloudflare, or HTTP.

Open Source

MIT licensed, transparent, and community‑driven.

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Self‑hosted

Bring your own database and infrastructure.

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Adapters

Redis, Postgres, SQLite, Cloudflare D1 & KV, and HTTP.

See adapters →

Plugins

Scopes, usage limits per key, IP access control, and more.

Explore plugins →

Rate Limiting

Global and token bucket strategies with persistent stores.

Learn more →

Examples

Next.js and Hono templates to get started quickly.

Browse examples →