Just a script to plot your download speed. Useful when you want to call your ISP and shit on them. Oh, and data is always sorted by timestamp.

speedTestPlot.js

#!/usr/bin/env node

/*
* How to:
* Have a working UNIX environment
* Download speedtest-cli
* -- in bash
* for i in {0..100}; do speedtest --no-upload --json >> dlspeed.json; done
* ./speedTestPlot.js dlspeed.json
* -- comments
* You can edit the for to have more / less tests.
* You can specify --server to go a little bit faster.
*/

const fs = require('fs');
const path = require('path');
const childProc = require('child_process');

if (!process.argv[2]) {
  const n = path.basename(process.argv[0]);
  const p = path.basename(process.argv[1]);

  console.error(`Usage: ${n} ${p} FILE`);
  process.exit(1);
}

const data = [];
fs.readFileSync(process.argv[2], { encoding: 'utf-8' }).split('\n')
  .forEach((line, index) => {
    try {
      data.push(JSON.parse(line));
    } catch (e) {
      console.error(`[warning] line ${index} was not parsed correctly.`);
    }
});

data.sort((a, b) => {
  const ad = new Date(a.timestamp).getTime();
  const bd = new Date(b.timestamp).getTime();

  return ad > bd ? 1 : -1;
});

const gnuplotProc = 'gnuplot';
const gnuplotArgs = ['-p', '-e', 'plot "-"'];
const child = childProc.spawn(gnuplotProc, gnuplotArgs, {
    stdio: [ 'pipe', 1, 2 ]
});

data.forEach((f) => {
  child.stdin.write(`${f.download}\n`);
});

child.stdin.end();