Chart.js

Chart.js is a simple yet flexible JavaScript charting library that provides eight core chart types: line, bar, radar, doughnut, pie, polar area, bubble, and scatter. Each chart type renders on an HTML5 Canvas element with smooth animations, responsive resizing, and interactive tooltips that display data values on hover.

The library works well with minimal configuration while remaining deeply customizable. A basic chart can be created in a few lines of code by passing a data object and optional configuration to a Chart constructor. For more complex needs, Chart.js exposes callbacks for custom tooltip formatting, axis tick generation, data point styling, and animation timing. Its plugin system allows extending functionality with zoom, annotation, and data labels.

For web development, Chart.js is a practical choice when projects need data visualization without the complexity of D3.js. It handles the most common charting scenarios well and integrates easily with frameworks through wrappers like react-chartjs-2 and vue-chartjs. The Canvas-based rendering performs efficiently even with moderately large datasets. The limitation is that Chart.js works within its predefined chart types, so highly custom visualizations may require D3.js instead.