Validate .env files against a JSON schema — catch misconfiguration before it reaches production
A Babel preset for each environment.
Offers getProxyForUrl to get the proxy URL for a URL, respecting the *_PROXY (e.g. HTTP_PROXY) and NO_PROXY environment variables.
AWS credential provider that sources credentials from known environment variables
Runtime agnostic JS utils
Run scripts that set and use environment variables across platforms
TypeScript SDK for Haven — agent wallet infrastructure
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
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.
Get paths for storing things like data, config, cache, etc
Get the PATH environment variable key cross-platform
Regular expression for matching a shebang line
A Babel preset that targets modern browsers by fixing engine bugs.
Haven MCP server for local, non-custodial agent payments
A JavaScript library for using Haven
MindooDB app SDK for building apps that connect to the Haven host bridge
GDPR-ready cookie consent manager with type definitions and zero dependencies
HANDLE CONFIGURATION ONCE AND FOR ALL
 [](https://jsr.io/@t3-oss/env-core) [](https://jsr.io/@t3-oss/env-core) [![Socket Bad