Tiny browser+node performance tracker

Usage no npm install needed!

<script type="module">
  import tinyPerfTracker from 'https://cdn.skypack.dev/tiny-perf-tracker';



License Version circleci coverage

(Tiny) performance tracker for node.js and browser.

This package includes:

  • tiny-perf-tracker Size (uncompressed) - Core performance tracker
  • tiny-perf-tracker/logger Size (uncompressed) - Debounced logger for client or server

Basic usage

import perf from 'tiny-perf-tracker';

const somethingDone = perf.track('something');
for (let i = 0; i < 10000000; i++);

This signature allows for concurrency without collision since the callback is tied to the original tracker, and not the metric name.

Live Demo

Detached Loggers

By default, no logger is attached. You can do simple things like:


or write the results to your own custom logger:

myLogger.write('perf', perf.toJSON());

Attached Loggers

Optionally you can attach a logger which will automatically be invoked on after 1000ms of log inactivity, like so:

import perfLogger from 'tiny-perf-tracker/logger';

perfLogger(perf, {
  logger: console.log // this can be omitted since it is the default
}); // invoked once per metric
// or dump the raw data instead of one string per metric
perfLogger(perf, {
  logger: data => myLogger.write('perf', data),
  raw: true

You can change the debounce time like so:

perfLogger(perf, { ms: 500 });
// or disable debounce entirely
perfLogger(perf, { ms: false });

Node.js File Logger

For node.js there's an additional option for debounced writing of stats to disk:

import perf from 'tiny-perf-tracker';
import logger from 'tiny-perf-tracker/logger';
import fileLogger from 'tiny-perf-tracker/fileLogger';

logger(perf, fileLogger('./stats.json'));


Custom Format

Yes we know, you hate the current output format. That's OK, we've got your OCD covered!

perf.fmt = (key, r) => `* perf:${key}> calls:${r.calls}, ms:${r.ms}`;

New Tracker

If you need to maintain more than one tracker, you can do so via:

const newPerf = perf.create();