How to create heatmaps in JavaScript: The Heat.js library - LogRocket Blog
Briefly

Heatmaps are frequently employed in visualizing data to illustrate the concentration and spread of data, using colors to demonstrate fluctuations and identify patterns easily.
Heat.js provides a user-friendly API for incorporating heatmaps into applications, customization with color schemes and CSS, data export options, multi-language support, and efficient updates for evolving datasets.
Heatmap.js is a highly capable heatmap library popular in the JavaScript community, offering advanced features and widely accepted functionality to create top-tier visualizations.
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