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HTML

              
                <label for="string">Slug:</label>
<input id="string" type="text" autocomplete="off">
<input type="checkbox" id="titlecase" />&nbsp;<span for="titlecase">Title Case</span>
<button onclick="convertString()">Apply</button>
<label for="results">Results:</label>
<input id="results" type="text" readonly/>
              
            
!

CSS

              
                label {
  display: block;
  width: 80px;
}

input[type="text"], a, button {
  margin: 10px 0;
  padding: 10px;
  width: 300px;
  max-width: 100%;
}

a, button {
  border: 1px solid #777;
  background-color: #ccc;
  width: auto;
  margin: 10px;
}
              
            
!

JS

              
                /**
 * Convert string into title style capitalization (each word)
 * 
 * @param {string}  string string to capitalize
 */
var titleStyle = (string) => {
  'use strict';
	var stringArray = string.split(' '),
		  i,
		  jointString = [],
		  tStyle,
      itemValue;

  //capitalizing each word on array
	for (i in stringArray) {
      if (stringArray.hasOwnProperty(i)) {
          //console.log(typeof i, i);
          itemValue = stringArray[i];
          if (itemValue.length > 2 || (itemValue.length < 2 && Math.abs(i) === 0)) {
				    jointString.push(
              itemValue.substring(0, 1).toUpperCase()
              + itemValue.substring(1, itemValue.length));
			    } else {
				    jointString.push(itemValue);
			    }
      }
	}
  
  //joining capitalized worlds or returning string as is
	tStyle = (jointString.length > 0) ? jointString.join(' ') : string;
	return tStyle;
}

/**
 * Convert slugged string into user readable friendly format, title format optional
 * 
 * @param {string}  slug string formatted for easy developing
 *                  and data transport with no spaces
 * 							    only alphanumerics, hashes and underscores.
 * @param {boolean} titleStyle value true by default
 */
var slugToString = (slug, tStyle = true) => {
	//converting hashes and underscore into blank spaces
	var newString = slug.replace(/-|_/g, ' ');
  //optional, converting into title case
	if (tStyle) { newString = titleStyle(newString); }
	return newString;
}

function convertString () {
  var stringField = $('#string'),
      resultField = $('#results'),
      tstyleField = $('#titlecase'),
      tstyle = tstyleField.is(':checked');
  
  if (stringField.val().length === 0) {
    alert('Enter slug string');
    return false;
  }
  
  resultField.val( slugToString( stringField.val(), tstyle ) );
  
  return false;
}
              
            
!
999px

Console