Data visualization provides insightful tools to visually analyze the data, observe the trend, compare the data series, filter out the data noise, etc.
I spent some time learning several most commonly used JavaScript data visualization libraries. It is really exciting to turn monotonous numbers into beautiful charts.
Here is the git repo that has the sample charts I am playing with: https://github.com/guozheng/learn-dataviz
If you want to quickly create charts using available ones, I'd recommend using either HighCharts or Google Charts. If you need to do heavy customization, or you need to create new chart types, then D3.js, NVD3, C3.js, React D3 provides the D3.js based solutions, very powerful and flexible.
