At the end of the Web

I have created a very small userscript for opera (might work ok with other browsers) that formats /indents/ beautifies the JSON data in a document if it’s only JSON there.

For opera to open the JSON by itself and this to work (the default is to present it as a download), you will have to enable that in opera. Go to preferences -> advanced -> downloads -> Add

Mimetype: application/json
Select open with opera

That will result in your JSON looking like this in the browser:

// ==UserScript==
// @name 		   JSON formatter
// @version        1.0
// @description	   Formats JSON if the document only contains JSON
// @compability    Only tested with Opera, might work with others
// @author		   Martin Hansen
// @website        http://martinhansen.no
// ==/UserScript==
(function(){
	var indentation = 4;//Change this to vary the indentation

	var pre = document.querySelector('body pre:only-child');
	if(!pre) return; //Don't do anything if this don't seem to be a json only document
	try{
		pre.innerHTML = JSON.stringify(JSON.parse(pre.innerHTML), null,indentation);
	}
	catch(e){
		console.log(e);
	}
})();

Either save the sourcecode directly from here, or get it from userscripts.org

Martin Javascript, opera, web