npm install chart.js
Chart.js built files are available on CDNJS:
https://cdnjs.com/libraries/Chart.js
Chart.js built files are also available through jsDelivr:
https://www.jsdelivr.com/package/npm/chart.js?path=dist
You can download the latest version of Chart.js on GitHub.
If you download or clone the repository, you must build Chart.js to generate the dist files. Chart.js no longer comes with prebuilt release versions, so an alternative option to downloading the repo is strongly advised.