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

index.ts

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

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

index.ts

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.

terminal

bun --print process.env

BAZ=stuff
FOOBAR=aaaaaa
<lots more lines>

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

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