Pipe Method

Definition

A method available on all Readable streams that automatically funnels its data into a Writable stream, automatically managing data flow and backpressure.

Explain Like I'm New

Piping is literally plumbing. If you have a hose shooting water (Readable Stream) and an empty pool (Writable Stream), the `.pipe()` method connects them. It automatically makes sure the hose doesn't shoot water faster than the pool can drain. If the pool gets full, `.pipe()` automatically pauses the hose.

Real World Example

A user asks to download a massive video from your server. Instead of loading the video into RAM, you do: `fs.createReadStream('video.mp4').pipe(res)`. The file streams directly from the hard drive straight out to the user's internet connection flawlessly.

Common Use Cases

•Streaming files to HTTP responses
•Connecting multiple Transform streams (like reading -> zipping -> encrypting -> writing)

Interactive Example

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Interview Questions

basic

What does `.pipe()` do?

intermediate

How does `.pipe()` handle backpressure?

Flash Cards

Question

What does it do?

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Answer

It attaches a Readable stream to a Writable stream, automatically passing data from one to the other.

Question

How does it handle backpressure?

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Answer

If the Writable stream is too slow, its internal buffer fills up and it returns `false`. The `.pipe()` mechanism detects this and automatically calls `.pause()` on the Readable stream. Once the Writable stream drains, it emits a `'drain'` event, and `.pipe()` automatically calls `.resume()` on the Readable stream.