Generate a .ssh/config file from your EC2 instances

generate_ssh_config.js

var AWS = require('aws-sdk');

AWS.config.update({region: 'eu-west-1'});

var ec2 = new AWS.EC2(); 

ec2.describeInstances({}, function(err, data) {

  data.Reservations.forEach(function(reservation) {
    reservation.Instances.forEach(function(instance) {
      var nameTag = instance.Tags.filter(function(tag) {
        return 'Name' === tag.Key;
      });

      var name = nameTag[0].Value.toLowerCase().replace('aws-', ''),
          ipAddress = instance.PublicIpAddress;

      if (!name || !ipAddress) {
        return;
      }

      console.log('Host ' + name);
      console.log('    Hostname ' + ipAddress);
      console.log('    Port 22');
    });
  });
});