debug data propeties in console

console_table.js

var result = Object.getOwnPropertyNames(data).filter(/./.test.bind(new RegExp("^g")));
console.table(data,Object.getOwnPropertyNames(data).filter(/./.test.bind(new RegExp("^g"))));

datalayer_table_inconsole.js

(function() {
    
    var elements = [].slice.call(document.querySelectorAll('*')).filter(function(el) {
        if (typeof (el.dataset) != "undefined")
            return Object.keys(el.dataset).length != 0;
    });
    
    var data = [];  //persists data if no var
    var i = elements.length;
    
    while (i--) {
        var el = JSON.parse(JSON.stringify(elements[i].dataset));
        data.push(el);
        el["gType"] = elements[i].nodeName;
    }
    console.table(data);
})();

debug_ecommerce_gtm_custom_JS_var

function() {
	var generalString = 
		"General--ID:" + {{transactionId}} +
		",AFF:" + {{transactionAffiliation}} +
		",TOT:" + {{transactionTotal}} +
		",TAX:" + {{transactionTax}} +
		",SHI:" + {{transactionShipping}} +
		"|";
	var productString = "";
    var numProducts = {{transactionProducts}}.length;
    for(var i=0; i<numProducts; i++) {
        if(i > 0) {productString = productString + "|"};
		productString = 
			productString + 
			"P" + (i+1) + 
			"--SKU:" + {{transactionProducts}}[i].sku + 
			",NAM:" + {{transactionProducts}}[i].name + 
			",PRI:" + {{transactionProducts}}[i].price + 
			",QUA:" + {{transactionProducts}}[i].quantity;
    }
    return generalString + productString;
}

with filter for columns.js

(function() {
    var elements = [].slice.call(document.querySelectorAll('*')).filter(function(el) {
        if (typeof (el.dataset) != "undefined")
            return Object.keys(el.dataset).length != 0;
    });
    var data = [];
    var i = elements.length;
    while (i--) {
        //var el = Object.getOwnPropertyNames(data).filter(/./.test.bind(new RegExp("^g"))));
        var el = JSON.parse(JSON.stringify(elements[i].dataset));
        var elslice={};
        for(prop in el){
           if(prop.match(/^g[EALT]/)){
               elslice[prop]=el[prop];
           }
        }
        elslice["gType"] = elements[i].nodeName;
        data.push(elslice);
    }
    console.table(data);
})();