This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The pipeThrough() method of the ReadableStream interface provides a chainable way of piping the current stream through a transform stream or any other writable/readable pair.

Piping a stream will generally lock it for the duration of the pipe, preventing other readers from locking it.


var transformedStream = readableStream.pipeThrough(transformStream[, options]);


A TransformStream (or an object with the structure {writable, readable}) consisting of a readable stream and a writable stream working together to transform some data from one form to another. Data writen to the writable stream can be read in some transformed state by the readable stream. For example, a TextDecoder, has bytes written to it and strings read from it, while a video decoder has encoded bytes written to it and uncompressed video frames read from it.
options Optional
The options that should be used when piping to the writable stream. It will be used in a call like pipeTo(writable, options).

Return value

The readable side of the transformStream.


The writable and/or readable property of transformStream are undefined.


In the following example (see Unpack chunks of a PNG for the full code running live, and png-transform-stream for the source code), an image is fetched and its body retrieved as a ReadableStream. Next, we log the contents of the readable stream, use pipeThrough() to send it to a new function that creates a gray-scaled version of the stream, then log the new stream's contents too.

// Fetch the original image
// Retrieve its body as ReadableStream
.then(response => response.body)
.then(rs => logReadableStream('Fetch Response Stream', rs))
// Create a gray-scaled PNG stream out of the original
.then(body => body.pipeThrough(new PNGTransformStream()))
.then(rs => logReadableStream('PNG Chunk Stream', rs))


Specification Status Comment
The definition of 'pipeThrough()' in that specification.
Living Standard Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 59Edge No support NoFirefox No support NoIE No support NoOpera Full support 46Safari ? WebView Android Full support 59Chrome Android Full support 59Firefox Android No support NoOpera Android Full support 43Safari iOS ? Samsung Internet Android Full support 7.0


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.