Generate a slug with JavaScript.

slugify.js

// sync example.
function createSlug(title) {
  return title
    .toLowerCase()
    .replace(/[^\w ]+/g,'')
    .replace(/ +/g,'-');
}

var slug = createSlug('This is a test!');
console.log(slug);

// Or some kind of async...
function createSlug(title, callback) {
  if (typeof title == 'string') {
    var slug = title
      .toLowerCase()
      .replace(/[^\w ]+/g,'')
      .replace(/ +/g,'-');
      
    return callback(null, slug);
  } else {
    return callback('Title is no string', null);
  }
}

createSlug('This is a test', function(err, slug) {
  if (err) {
    throw new Error(err);
  } else {
    console.log(slug); 
  }
});