RunKit + npm: npm-name

const npmName = require("npm-name"); (async () => { console.log('1 ' + await npmName('chalk')); // Exists, returns false console.log('2 ' + await npmName('hallonkola')); // Does not exist, returns true console.log('3 ' + await npmName('@hdsydsvenskan/graphql-partials')); // Exists, returns false console.log('4 ' + await npmName('@hdsydsvenskan/config-loader')); // Exists, but returns true })();