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Top Free and Open Source JavaScript Libraries

As we all know JavaScript is becoming so popular day-by-day and used almost in all the spaces. A beautiful JavaScript chart would be the best way to visualize data in the form of beautiful, easy to understand, interactivity. They make it easier to extract and convey key patterns and insights that are often not apparent with static charts.

I have been working with JavaScript for long time and worked with various charts all over the time. The below listed free and open source JavaScript chart libraries help you to find the best JavaScript charting library for creating beautiful charts.

D3.js — Data-Driven Documents

D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS. D3’s emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation.

Best for : Experts level not afraid to code.
License: Open-source. Free for all uses.

Google Charts

Google chart tools are powerful, simple to use, and free. The Google Visualization API allows you to create charts and reporting applications over structured data and helps integrate these directly into your website. There is an active Google Charts forum where users help one another learn and discover the best ways to convey information graphically.

Best for : Any level.
License: Free for all uses but not open-source.  Google’s licensing does not allow to host their JavaScript files on your server.

Flot

Flot is a pure JavaScript plotting library for jQuery, with a focus on simple usage, attractive looks and interactive features. Well documented and works with Internet Explorer 6+, Chrome, Firefox 2+, Safari 3+ and Opera 9.5+

Best for : Intermediate and Beginners.
License: Free.

jQuery Sparklines

This jQuery plugin generates sparklines (small inline charts) directly in the browser using data supplied either inline in the HTML, or via JavaScript. The plugin has no dependencies other than jQuery and compatible with most modern browsers and has been tested with Firefox 2+, Safari 3+, Opera 9, Google Chrome and Internet Explorer 6, 7, 8, 9 & 10 as well as iOS and Android.

Best for : Any level.
License: Free.

Morris Charts

Morris.js is the library that powers the graphs on http://howmanyleft.co.uk/. It’s a very simple API for drawing line, bar, area and donut charts.

Best for : Any level.
License: Free.

Chart.js

Although it has very few options but very simple yet flexible JavaScript charting for designers & developers. ChartJS charts are responsive by default. They work well in mobiles and tablets. With 6 different types of core charts out of the box (core, bar, doughnut, radar, line, and polar area), ChartJS is definitely one of the most impressive open source charting libraries in recent times.

Best for : Any level.
License: Free.

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