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Read environment variables

Access the current environment variables with process.env.

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

Bun also exposes these variables as Bun.env, an alias of process.env.

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

To print all currently-set environment variables, run bun --print process.env.

bun --print process.env
ProcessEnv {
  BAZ: "stuff",
  FOOBAR: "aaaaaa",
  <lots more lines>
}

See Environment variables.

Translation © 2026 fanyi.dev · Original © 2026 the Bun project (LICENSE.md names no copyright holder) (MIT)