Generate `npm install` commands from existing package.json file.

npm-package-regenerate.js

const fs = require('fs');

function buildCommand(deps,flag = '') {
	if (!deps) return;
	const packages = Object.entries(deps)
		.map(([name,version]) => `${name}@${version.replace(/^[\^~]/,'')}`)
		.join(' ');

	if (flag) {
		flag = ' ' + flag;
	}
	return `npm install${flag} ${packages}`;
}

try {
	const pkg = JSON.parse(fs.readFileSync('./package.json','utf8')),
		prodCmd = buildCommand(pkg.dependencies),
		devCmd = buildCommand(pkg.devDependencies,'--save-dev');

	if (prodCmd) {
		console.log(prodCmd);
	}

	if (devCmd) {
		console.log(devCmd);
	}
} catch (ex) {
	console.error(ex.message);
}