Installs node_modules into temp directory and gives you access to them. This lets you avoid needing a node_modules folder.

installDeps.js

function installDeps(deps, quiet, cb) {
	const hash = require('crypto').createHash('md5').update(__filename).digest('hex')
	const dir = require('os').tmpdir() + require('path').sep + hash
	try {
		require('fs').mkdirSync(dir)
		if (!quiet) console.log(`Created temp folder at "${dir}"`)
	} catch (e) {}
	try {
		require('fs').writeFileSync(dir + require('path').sep + 'package.json', JSON.stringify({
			name: hash, description: hash, author: hash, repository: hash, license: "ISC",
			dependencies: deps.reduce((p, c) => { p[c]='latest'; return p; }, {})
		}))
		if (!quiet) console.log("Created package.json")
	} catch (e) {}
	if (!quiet) console.log("Ensuring dependencies are installed")
	require('child_process').execSync(`cd ${dir} && npm install`)
	cb.apply(undefined, deps.map(d => require(`${dir}/node_modules/${d}`.replace(/\\/g,'/'))))
}

/* Example
installDeps(['request', 'cheerio'], false, (request, cheerio) => {})
*/