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

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Read environment variables

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

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

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

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

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

$ bun run env
BAZ=stuff
FOOBAR=aaaaaa
<lots more lines>

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