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var myObject = {
	"prop": "value",
	"subObj": {
		"subProp": "subValue"
	},
	"listObj": [
		{"listProp1": "listValue1"},
		{"listProp2": "listValue2"},
		{"listProp3": "listValue3"}
	]
};

var formatted = JSON.stringify(myObject, null, 4);

console.log(formatted);

/*
Devuelve

{
    "prop": "value",
    "subObj": {
        "subProp": "subValue"
    },
    "listObj": [
        {
            "listProp1": "listValue1"
        },
        {
            "listProp2": "listValue2"
        },
        {
            "listProp3": "listValue3"
        }
    ]
}

*/