A Pen by Nelson Polanco.

index.html

<pre><code id=acct></code></pre>
<pre><code id=planets></code></pre>

script.js

/**
 * Pretty Print JSON Objects.
 * Inspired by http://jsfiddle.net/unLSJ/
 *
 * @return {string}    html string of the formatted JS object
 * @example:  var obj = {"foo":"bar"};  obj.prettyPrint();
 */
Object.prototype.prettyPrint = function(){
    var jsonLine = /^( *)("[\w]+": )?("[^"]*"|[\w.+-]*)?([,[{])?$/mg;
    var replacer = function(match, pIndent, pKey, pVal, pEnd) {
        var key = '<span class="json-key" style="color: brown">',
            val = '<span class="json-value" style="color: navy">',
            str = '<span class="json-string" style="color: olive">',
            r = pIndent || '';
        if (pKey)
            r = r + key + pKey.replace(/[": ]/g, '') + '</span>: ';
        if (pVal)
            r = r + (pVal[0] == '"' ? str : val) + pVal + '</span>';
        return r + (pEnd || '');
    };

    return JSON.stringify(this, null, 3)
               .replace(/&/g, '&amp;').replace(/\\"/g, '&quot;')
               .replace(/</g, '&lt;').replace(/>/g, '&gt;')
               .replace(jsonLine, replacer);
}


var account = { active: true, codes: [48348, 28923, 39080], city: "London" };
var planets = [{ name: 'Earth', order: 3, stats: { life: true, mass: 5.9736 * Math.pow(10, 24) } }, { name: 'Saturn', order: 6, stats: { life: null, mass: 568.46 * Math.pow(10, 24) } }];

document.getElementById('acct').innerHTML = account.prettyPrint();
document.getElementById('planets').innerHTML = planets.prettyPrint();

Simple-JSON-Object-Pretty-Print..markdown

Simple JSON Object Pretty Print.

Makes JSON objects a lot easier to read. Great for debugging.

A Pen by Nelson Polanco on CodePen.

License.

style.css

body{
  background: #efefef;
}
pre {
   background-color: ghostwhite;
   border: 1px solid silver;
   padding: 10px 20px;
   margin: 20px;
   border-radius: 4px;
  width: 25%;
  margin-left: auto;
  margin-right: auto;
   }