Bulletproof environment variable validation with perfect TypeScript inference, beautiful errors, and zero dependencies.
Castle Fingerprinting Script
Castle SDK for Node
Castle SDK for React Native
recursive object extending & overriding
PGP library for renovate
A Babel preset for each environment.
A cli to convert avro schemas into typescript interfaces
AWS credential provider that sources credentials from known environment variables
Offers getProxyForUrl to get the proxy URL for a URL, respecting the *_PROXY (e.g. HTTP_PROXY) and NO_PROXY environment variables.
Runtime agnostic JS utils
Castle CLI for local deck creation, preview, editing, and saving
core components
Run scripts that set and use environment variables across platforms
Convert modern CSS into something browsers understand
Next.js dotenv file loading
A global executable to run applications with the ENV variables loaded by dotenv
Loads environment variables from .env file
Your agent, your machine, your keys. An MCP server that adds encrypted state, approval gates, and a portable identity to any AI agent.
hydrate environment variables from .env files into process.env
Executes a command using the environment variables in an env file
Uses export conditions to return environment information in a way that works with major bundlers and runtimes.
Convert avro schemas into typescript interfaces
OpenCastle Alchemist — `castle` trading-strategy CLI. Pair with the `opencastleai/alchemist-skill` Claude Code plugin for the agent-facing skill.