# @t3-oss/env-core

> ![NPM Version](https://img.shields.io/npm/v/%40t3-oss%2Fenv-core) [![JSR](https://jsr.io/badges/@t3-oss/env-core)](https://jsr.io/@t3-oss/env-core) [![JSR Score](https://jsr.io/badges/@t3-oss/env-core/score)](https://jsr.io/@t3-oss/env-core) [![Socket Bad

Latest version **0.13.11** (published 2026-03-22) · MIT license · 0 weekly downloads

## Install

```sh
npm install @t3-oss/env-core
pnpm add @t3-oss/env-core
yarn add @t3-oss/env-core
bun add @t3-oss/env-core
```

## Health

**Score 55/100 (C)** — status: stable.

Positive: esm support; no vulnerabilities; has provenance.

Warnings: low downloads; no types; pre 1.0.

## Facts

| | |
|---|---|
| Version | 0.13.11 |
| Published | 2026-03-22 |
| First published | 2023-04-23 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | ESM |
| Dependencies | 0 |
| Unpacked size | 129.9 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 4006 |
| Author | Julius Marminge |
| Maintainers | nexxel, juliusmarminge |
| Keywords | create-t3-app, environment variables, zod |

## Links

- npm: https://www.npmjs.com/package/@t3-oss/env-core
- Repository: https://github.com/t3-oss/t3-env
- Homepage: https://github.com/t3-oss/t3-env#readme
- Issues: https://github.com/t3-oss/t3-env/issues
- npm.io page: https://npm.io/package/@t3-oss/env-core

## Alternatives

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- [env-contract](https://npm.io/package/env-contract.md) — 133 weekly downloads
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- [ts-global-type-extra](https://npm.io/package/ts-global-type-extra.md) — 11 weekly downloads

## Recent versions

- 0.13.11 (latest) — 2026-03-22
- 0.13.4-canary.2c99b41 (canary) — 2025-04-30
- 0.1.0-alpha.0 (alpha) — 2023-04-23
- 0.13.10 — 2025-12-15
- 0.13.9 — 2025-12-15
- 0.13.8 — 2025-06-09
- 0.13.7 — 2025-06-09
- 0.13.6 — 2025-05-27
- 0.13.5 — 2025-05-27
- 0.13.4 — 2025-04-30
- 0.13.3 — 2025-04-30
- 0.13.2 — 2025-04-30
- 0.13.1 — 2025-04-30
- 0.13.1-canary.c99c35e — 2025-04-30
- 0.13.1-canary.f66e736 — 2025-04-30
- … 41 more at https://npm.io/package/@t3-oss/env-core/versions

## README

# Typesafe Envs made Simple

![NPM Version](https://img.shields.io/npm/v/%40t3-oss%2Fenv-core)
[![JSR](https://jsr.io/badges/@t3-oss/env-core)](https://jsr.io/@t3-oss/env-core)
[![JSR Score](https://jsr.io/badges/@t3-oss/env-core/score)](https://jsr.io/@t3-oss/env-core)
[![Socket Badge](https://socket.dev/api/badge/npm/package/@t3-oss/env-core)](https://socket.dev/npm/package/@t3-oss/env-core/overview)

This is the framework agnostic core package of t3-env.

> For full documentation, see https://env.t3.gg

## Installation

```bash
# npm
npm i @t3-oss/env-core

# pnpm
pnpm add @t3-oss/env-core

# bun
bun add @t3-oss/env-core

# deno
deno add jsr:@t3-oss/env-core
```

## Usage

> [!NOTE]
>
> You may use any [Standard Schema](https://standardschema.dev) compliant validator of your choice. This example uses Zod.
> See the [documentation](https://env.t3.gg/docs/standard-schema) for more details.

```ts
// src/env.ts
import { createEnv } from "@t3-oss/env-core";
import * as z from "zod";

export const env = createEnv({
  /*
   * Serverside Environment variables, not available on the client.
   * Will throw if you access these variables on the client.
   */
  server: {
    DATABASE_URL: z.url(),
    OPEN_AI_API_KEY: z.string().min(1),
  },
  /*
   * Environment variables available on the client (and server).
   *
   * 💡 You'll get type errors if these are not prefixed with PUBLIC_.
   */
  clientPrefix: 'PUBLIC_',
  client: {
    PUBLIC_CLERK_PUBLISHABLE_KEY: z.string().min(1),
  },
  /*
   * Specify what values should be validated by your schemas above.
   */
  runtimeEnv: process.env,
});
```

---
_Source: https://npm.io/package/@t3-oss/env-core · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._