Skip to main content

Bun home page

[Runtime

](../../../index.md)[Package Manager

](../../../pm/cli/install/index.md)[Bundler

](../../../bundler/index.md)[Test Runner

](../../../test/index.md)[Guides

](../../index.md)[Reference

](https://bun.com/reference)[Blog

](https://bun.com/blog)[Feedback

](../../../feedback/index.md)

Use Bun.spawn() to spawn a child process.

const proc = Bun.spawn(["echo", "hello"]);

// await completion
await proc.exited;

The second argument accepts a configuration object.

const proc = Bun.spawn(["echo", "Hello, world!"], {
  cwd: "/tmp",
  env: { FOO: "bar" },
  onExit(proc, exitCode, signalCode, error) {
    // exit handler
  },
});

By default, the stdout of the child process can be consumed as a ReadableStream using proc.stdout.

const proc = Bun.spawn(["echo", "hello"]);

const output = await proc.stdout.text();
output; // => "hello\n"

See Docs > API > Child processes for complete documentation.

Was this page helpful?

Suggest editsRaise issue

[

Enable compression for WebSocket messages

Previous

](../../websocket/compression/index.md)[

Read stdout from a child process

Next

](../spawn-stdout/index.md)