The caffeine dataset (free JSON, attribution license)
The Barista Life caffeine dataset, free for developers, researchers, and writers: 46 drinks with caffeine per serving and per ounce, every entry verified against manufacturer or USDA data and linked to its sourced guide.
License
Free for any use with attribution: link "data by Barista Life" to baristalife.co wherever the data appears. That is the whole license.
Also available
The embeddable comparison widget (drop-in script), the interactive tool, and the human-readable chart. Want a drink added or spot an update we missed? Tell us; corrections ship within the week per our editorial standards.