Javascript to list all fonts used within a Photoshop document. May take a while on large documents to finish…

fonts.jsx

#target photoshop

function sort_unique(arr)
{
	arr = arr.sort();
	var ret = [arr[0]];
	
	for (var i = 1; i < arr.length; i++)
	{
		if (arr[i-1] !== arr[i]) { ret.push(arr[i]); }
		
	}
	
	return ret;
	
}

function find_text_layers(doc, layers)
{
	var count = doc.layers.length;
	
	for (var i = 0; i < count; i++)
	{
		var layer = doc.layers[i];
		
		if (layer.typename == "ArtLayer")
		{
			if (layer.visible && layer.kind == "LayerKind.TEXT" && layer.textItem.contents)
			{
				var text = layer.textItem;
				layers.push(text.font);
				
			}
			
		}
		else if (layer.typename == "LayerSet")
		{
			if (layer.visible)
			{
				find_text_layers(layer, layers);
			}
			
		}
		
	}
	
}

function main()
{
	var doc = app.activeDocument;
	var text_layers = new Array();
	
	find_text_layers(doc, text_layers);
	text_layers = sort_unique(text_layers);
	
	text_layers.reverse();
	text_layers.push("Fonts used in this document");
	text_layers.reverse();
	
	alert(text_layers.join("\n"));
	
}

main();