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stream-transform

Object transformations implementing the Node.js `stream.Transform` API

  • 3.3.3
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What is stream-transform?

The stream-transform package is a simple and powerful tool for transforming data in Node.js streams. It allows you to easily modify data as it passes through a stream, making it highly useful for tasks such as data manipulation, filtering, and aggregation in real-time data processing applications.

What are stream-transform's main functionalities?

Synchronous Transformation

This feature allows for synchronous data transformation within a stream. The provided code sample demonstrates how to read data from a CSV file, transform each record by joining its elements with a space, and then output the transformed data.

const transform = require('stream-transform');
const transformer = transform(function(record, callback){
  setTimeout(function(){
    callback(null, record.join(' ') + '\n');
  }, 500);
}, {parallel: 5});
require('fs').createReadStream('/path/to/source.csv').pipe(transformer).pipe(process.stdout);

Asynchronous Transformation

This feature supports asynchronous transformation of stream data. The code sample shows how to asynchronously convert each piece of data to uppercase before passing it through the stream.

const transform = require('stream-transform');
const transformer = transform(function(record, callback){
  process.nextTick(function(){
    callback(null, record.toUpperCase());
  });
});
require('fs').createReadStream('/path/to/source.txt').pipe(transformer).pipe(process.stdout);

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Package last updated on 21 Nov 2024

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