chartjs/chart.js

Chart.js is a JavaScript library for creating interactive, visually appealing charts and graphs directly in the browser. The problem it solves is that turning raw data into a visual chart on a web page requires significant work with low-level browser drawing APIs, but Chart.js handles all of that complexity behind a simple interface. The way it works is you provide your data and some configuration options in JavaScript, and Chart.js draws the chart onto an HTML canvas element, a rectangular area on the page that the browser uses for pixel-based drawing. The library supports a wide variety of chart types including line charts, bar charts, pie and doughnut charts, radar charts, scatter plots, and bubble charts. Charts are responsive by default, meaning they resize gracefully when the browser window changes size, and they include built-in interactivity such as hover tooltips and click events. Configuration is done through JavaScript objects where you describe your dataset labels, colors, axis settings, legend placement, animation behavior, and more. The library is flexible enough that designers can create polished, branded charts while developers can integrate data programmatically without needing to write any low-level drawing code. An active extension ecosystem adds additional chart types and integrations on top of the core library. You would use Chart.js whenever you need to display data visually on a website or web application, dashboards, analytics pages, reports, scientific visualizations, or any situation where a table of numbers would be clearer as a visual. It is one of the most popular charting libraries in the JavaScript ecosystem and is well-suited for projects ranging from simple blog posts to complex data applications. It installs via npm or can be loaded directly from a CDN. The library is written in JavaScript and runs in any modern browser.