63 lines
1.3 KiB
Plaintext
63 lines
1.3 KiB
Plaintext
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---
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title: Read from stdin
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sidebarTitle: Read from stdin
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mode: center
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---
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In Bun, the `console` object is an `AsyncIterable` that yields lines from `stdin`.
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```ts index.ts icon="/icons/typescript.svg"
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const prompt = "Type something: ";
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process.stdout.write(prompt);
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for await (const line of console) {
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console.log(`You typed: ${line}`);
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process.stdout.write(prompt);
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}
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```
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---
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Running this file starts a never-ending interactive prompt that echoes whatever you type.
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```sh terminal icon="terminal"
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bun run index.ts
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```
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```txt
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Type something: hello
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You typed: hello
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Type something: hello again
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You typed: hello again
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```
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---
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Bun also exposes `stdin` as a `BunFile`, `Bun.stdin`. Use it to incrementally read large inputs piped into the `bun` process.
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Chunks aren't guaranteed to be split line-by-line.
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```ts stdin.ts icon="/icons/typescript.svg"
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for await (const chunk of Bun.stdin.stream()) {
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// chunk is Uint8Array
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// this converts it to text (assumes UTF-8 encoding)
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const chunkText = Buffer.from(chunk).toString();
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console.log(`Chunk: ${chunkText}`);
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}
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```
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---
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Running `stdin.ts` prints whatever is piped into it.
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```sh terminal icon="terminal"
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echo "hello" | bun run stdin.ts
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```
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```txt
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Chunk: hello
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```
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---
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See [Utils](/runtime/utils) for more utilities.
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