Error: Cannot find module '/node_modules\progressbar/package.json'

I am using Browserify and progressbar.js to var ProgressBar = require('node_modules/progressbar'); but the progress bar is not being generating I am getting the following error Error: Cannot find module '/node_modules\progressbar/package.json'

'use strict';

    window.onload = function onLoad() {

        var ProgressBar = require('node_modules/progressbar');

        var circle = new ProgressBar.Circle('#progress', {
            color: 'red',
            duration: 3000,
            easing: 'easeInOut'
        });
        circle.animate(1);
    }

In the Browserify bundle file .call(this,"/node_modules\\progressbar")}

How I installed progressbar.js

npm install --save progressbar

npm progressbar.js

progressbar.js

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