Common React foundation — headless hooks, the cn class-merge utility, and a theme provider.

Tiny result helpers for @modelcontextprotocol/sdk MCP servers.

Framework-agnostic sliding-window rate limiter for Node API projects, with a pluggable store (in-memory or Redis).

Framework-agnostic liveness/readiness health-check registry for Node API projects.

Promise-based S3 file upload for Hono — parses multipart via c.req.parseBody() and PUTs to S3; public/private ACL, cache-control, deterministic keys, typed errors.

Framework-agnostic HTTP error classes for Node.js APIs.

Framework-agnostic graceful shutdown for Node API servers — SIGTERM/SIGINT drain with ordered cleanup hooks and a hard timeout.

Framework-agnostic per-request timeout for Node API projects — race a promise against a deadline and reject with a ServiceUnavailableError.

Framework-agnostic webhook signature verification (HMAC) for Node API projects.

Small, tree-shakeable TypeScript wrappers around 49 browser Web APIs — each one a separate subpath export.

Express security-headers middleware — a thin helmet wrapper with API-friendly defaults.

Promise-based S3 file upload for Express via multer-s3 — public/private ACL, cache-control, deterministic keys, typed errors.

Framework-agnostic JWT sign/verify helpers with Bearer-header and cookie token extraction.

Consistent success-response envelope and zod schema helper for Node API projects.

Express router that serves Scalar API docs from an OpenAPI spec object.

Zod request validation helpers with pretty error formatting for Node API projects.

Test helpers for API projects: supertest re-export, JWT auth fixtures, and response assertion matchers.

Small Express utility helpers: client IP extraction and route logging.

Framework-agnostic OpenAPI 3.1 helpers — generate Scalar docs HTML from a spec object.

Load and validate environment variables with dotenv + zod for Node API projects.