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The best effort sub-millisecond interval timer.

This module is confirmed to work on the Chrome and node.js. But, the Firefox or the Microsoft Edge may confuse.

Simple Example

let ft = require("fractional-timer");
let ftid = ft.setInterval(()=>{
    }, 0.001); // 1 micro-seconds 


$ npm install fractional-timer

For using on the browser, use browserify or the static methods named setInterval and clearInterval provided by the FractionalTimer class.


  • setInterval( func , delay ) starts the interval timer process. This returns the timer id.
  • clearInterval(fractional-timer-id) stops the timer.

Both of above exported functions are almost same to the standard version provided except for that the delay duration of setInterval could be set as less than a milliseconds.


  • v1.0.2 - Remove the harmony features that uglify-js does not support.
  • v1.0.1 - Fix the bug that could not work on web-browser. issue#1


This software is released under the MIT License, see LICENSE