Indent JSON with JavaScript

By  on  

Working with XML and JavaScript is a nightmare, which is why JSON has become gold in the development community.  Hell, I even wrote a function to turn XML to JSON with JavaScript.  If you want to turn an existing object into well formatted JSON, you can you JSON.stringify(obj), but you already know that.  What you may not know is that you can do pretty formatting when generating JSON from objects!

The secret is using the third JSON.stringify argument which represents the space indentation levels:

var formatted = JSON.stringify(myObject, null, 2);

/*
	Result:

	{
		"myProp": "myValue",
		"subObj": {
			"prop": "value"
		}
	}

*/

The resulting JSON representation will be formatted and indented with two spaces!

Recent Features

  • By
    CSS Gradients

    With CSS border-radius, I showed you how CSS can bridge the gap between design and development by adding rounded corners to elements.  CSS gradients are another step in that direction.  Now that CSS gradients are supported in Internet Explorer 8+, Firefox, Safari, and Chrome...

  • By
    Serving Fonts from CDN

    For maximum performance, we all know we must put our assets on CDN (another domain).  Along with those assets are custom web fonts.  Unfortunately custom web fonts via CDN (or any cross-domain font request) don't work in Firefox or Internet Explorer (correctly so, by spec) though...

Incredible Demos

Discussion

  1. MaxArt

    For more advanced formatting, I’ve developed a tool for the intent:
    https://github.com/MaxArt2501/json-fmt
    It works a client library or a server module for node/io.js, has a CLI, and a Grunt and a Gulp plugin.

    Of course, if you need speed just use JSON.stringify.

    Sorry for the self-promotion.

  2. You can also format a JSON file in the terminal with a single command.

    python -m json.tool unformatted.json > formatted.json

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!