pretty-print-nashorn.cfm

<cfscript>
	function prettyPrintJSON (inputJSON) {
		var engine = createObject("java","javax.script.ScriptEngineManager").init().getEngineByName("nashorn");
    		engine.eval("
			function prettyPrintJSON (data) {
				return JSON.stringify(JSON.parse(data), null, '\t');
			}
		");
		return engine.invokeFunction("prettyPrintJSON", [inputJSON]);
	}
</cfscript>

<cfsavecontent variable="myJSON">
	{"a":1,"b":"foo","c":[true,false,null,"null",{"d":{"e":130000,"f":1.3e5}}]}
</cfsavecontent>

<cfoutput>
	<textarea style="width:100%; height: 100%">#prettyPrintJSON(myJSON)#</textarea>
</cfoutput>