Downloads of npm packages by major version (last 7 days)

count-npm-package-downloads.mjs

// Run this script via: node --no-warnings --experimental-fetch count-npm-package-downloads.mjs <package>

import { argv } from 'node:process'

const packageName = argv.at(-1)
const downloadsByMajorVersion = new Map()

const page = await (await fetch(`https://www.npmjs.com/package/${packageName}?activeTab=versions`)).text()
const regex = /">(?<version>[\d.]+)<\/a><div class="[^"]+"><\/div><code class="downloads">(?<downloads>[\d,]+)<\/code>/g

for (let match of page.matchAll(regex)) {
	const majorVersion = match.groups.version.split('.')[0]
	const downloads = Number(match.groups.downloads.replace(/,/g, ''))

	downloadsByMajorVersion.set(majorVersion, (downloadsByMajorVersion.get(majorVersion) ?? 0) + downloads)
}

console.log(`Downloads per major version for package ${packageName}:`)
for (const [majorVersion, downloads] of downloadsByMajorVersion) {
	console.log(`${majorVersion}.x: ${new Intl.NumberFormat().format(downloads)}`)
}