# Bun Read environment variables

> Read environment variables

- Skill: `jarle/bun-read-environment-variables` (Agent Skill)
- Install (CLI): `npx skillmds@latest add jarle/bun-read-environment-variables`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jarle/bun-read-environment-variables/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: jarle (https://skillmd.com/u/jarle)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/jarle/bun-read-environment-variables

---


# Read environment variables

The current environment variables can be accessed via `process.env`.

```ts index.ts icon="https://mintcdn.com/bun-1dd33a4e/nIz6GtMH5K-dfXeV/icons/typescript.svg?fit=max&auto=format&n=nIz6GtMH5K-dfXeV&q=85&s=5d73d76daf7eb7b158469d8c30d349b0" theme={"theme":{"light":"github-light","dark":"dracula"}}
process.env.API_TOKEN; // => "secret"
```

***

Bun also exposes these variables via `Bun.env`, which is a simple alias of `process.env`.

```ts index.ts icon="https://mintcdn.com/bun-1dd33a4e/nIz6GtMH5K-dfXeV/icons/typescript.svg?fit=max&auto=format&n=nIz6GtMH5K-dfXeV&q=85&s=5d73d76daf7eb7b158469d8c30d349b0" theme={"theme":{"light":"github-light","dark":"dracula"}}
Bun.env.API_TOKEN; // => "secret"
```

***

To print all currently-set environment variables to the command line, run `bun --print process.env`. This is useful for debugging.

```sh terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
bun --print process.env
```

```txt  theme={"theme":{"light":"github-light","dark":"dracula"}}
BAZ=stuff
FOOBAR=aaaaaa
<lots more lines>
```

***

See [Docs > Runtime > Environment variables](/runtime/environment-variables) for more information on using environment variables with Bun.