bun.sh/docs/guides/runtime/set-env.md

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Set environment variables

The current environment variables can be accessed via process.env or Bun.env.

Bun.env.API_TOKEN; // => "secret"
process.env.API_TOKEN; // => "secret"

---

Set these variables in a .env file.

Bun reads the following files automatically (listed in order of increasing precedence).

• .env
• .env.production, .env.development, .env.test (depending on value of NODE_ENV)
• .env.local

FOO=hello
BAR=world

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Variables can also be set via the command line.

{% codetabs %}

$ FOO=helloworld bun run dev

# Using CMD
$ set FOO=helloworld && bun run dev

# Using PowerShell
$ $env:FOO="helloworld"; bun run dev

{% /codetabs %}

See Docs > Runtime > Environment variables for more information on using environment variables with Bun.