how to create a new folder in the file system in node js code example

Example: nodejs make directory

var fs = require('fs');
var dir = './tmp';
if (!fs.existsSync(dir)){
    fs.mkdirSync(dir);
}

// or if complains about existence and nesting doesn't matter:

var shell = require('shelljs');
shell.mkdir('-p', 'root/parent/tmp');