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through

simplified stream contruction

  • 1.1.2
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  • npm
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What is through?

The 'through' npm package is a simple wrapper around Node.js streams.Transform to create readable/writable streams easily using simple functions for the 'write' and 'end' parts of a stream. It is often used to transform or manipulate data in a stream.

What are through's main functionalities?

Stream Transformation

This code sample demonstrates how to create a simple stream transformation that converts all incoming data to uppercase. The 'write' function is called for every chunk of data, and 'end' is called when there is no more data.

var through = require('through');
var tr = through(function write(data) {
  this.queue(data.toString().toUpperCase());
}, function end() { // optional
  this.queue(null);
});
process.stdin.pipe(tr).pipe(process.stdout);

Stream Filtering

This code sample shows how to filter the stream to only pass through data chunks longer than 10 characters. It uses the 'write' function to decide whether to pass the data along or not.

var through = require('through');
var tr = through(function write(data) {
  if (data.length > 10) {
    this.queue(data);
  }
});
process.stdin.pipe(tr).pipe(process.stdout);

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Package last updated on 20 Nov 2012

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