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hdr-histogram-js

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hdr-histogram-js

TypeScript port of HdrHistogram

  • 3.0.0
  • latest
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  • npm
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What is hdr-histogram-js?

The hdr-histogram-js package is a JavaScript implementation of High Dynamic Range (HDR) Histogram, which is designed to offer a fast and accurate way to record and analyze the distribution of measured data points across a wide range with high precision. It is particularly useful for capturing latency and performance data in applications.

What are hdr-histogram-js's main functionalities?

Recording values

This feature allows users to record values into the histogram. It's useful for tracking the distribution of events such as request latencies.

const hdr = require('hdr-histogram-js');
const histogram = hdr.build();
histogram.recordValue(1000);

Retrieving statistics

After recording values, hdr-histogram-js can compute various statistics like percentiles, maximum, and mean values. This is useful for performance analysis and understanding the distribution of your data.

const percentile90 = histogram.getValueAtPercentile(90);
const max = histogram.maxValue;
const mean = histogram.getMean();

Encoding and decoding

hdr-histogram-js supports encoding histograms into a compressed Base64 format and decoding them back. This feature is useful for efficiently transmitting histograms over the network or storing them.

const encodedHistogram = hdr.encodeIntoCompressedBase64(histogram);
const decodedHistogram = hdr.decodeFromCompressedBase64(encodedHistogram);

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Package last updated on 28 Dec 2021

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