diff --git a/bin/xlsx2csv.njs b/bin/xlsx2csv.njs
index a7f63c5..44ba00f 100755
--- a/bin/xlsx2csv.njs
+++ b/bin/xlsx2csv.njs
@@ -25,22 +25,5 @@ if(xlsx.SheetNames.indexOf(sheetname)===-1) {
 	process.exit(1);
 }
 
-function stringify(val) {
-	switch(val.t){
-		case 'n': return val.v;
-		case 's': case 'str': return JSON.stringify(val.v);
-		default: throw 'unrecognized type ' + val.t;
-	}
-}
 var sheet = xlsx.Sheets[sheetname];
-if(sheet["!ref"]) {
-	var r = utils.decode_range(sheet["!ref"]);
-	for(var R = r.s.r; R <= r.e.r; ++R) { 
-		var row = [];
-		for(var C = r.s.c; C <= r.e.c; ++C) {
-			var val = sheet[utils.encode_cell({c:C,r:R})];
-			row.push(val ? stringify(val) : "");
-		}
-		console.log(row.join(","));
-	}
-}
+console.log(XLSX.utils.sheet_to_csv(sheet));
diff --git a/index.html b/index.html
index c30c5cf..3d21968 100644
--- a/index.html
+++ b/index.html
@@ -20,47 +20,30 @@
 <script src="xlsx.js"></script>
 <script>
 function get_radio_value( radioName ) {
-    var radios = document.getElementsByName( radioName );
-    for( var i = 0; i < radios.length; i++ ) {
-        if( radios[i].checked ) {
-            return radios[i].value;
-        }
-    }
+	var radios = document.getElementsByName( radioName );
+	for( var i = 0; i < radios.length; i++ ) {
+		if( radios[i].checked ) {
+			return radios[i].value;
+		}
+	}
 }
 
 //Row object array form:
 //Each row is an object with column headers as keys
 function to_json(workbook) {
-    var result = {};
-    workbook.SheetNames.forEach(function(sheetName) {
-        var rObjArr = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
-        if(rObjArr.length > 0){
-            result[sheetName] = rObjArr;
-        }
-    });
-    return result;
+	var result = {};
+	workbook.SheetNames.forEach(function(sheetName) {
+		var rObjArr = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
+		if(rObjArr.length > 0){
+			result[sheetName] = rObjArr;
+		}
+	});
+	return result;
 }
 
 
 function to_csv(sheet) {
-    function stringify(val) {
-        switch(val.t){
-    		case 'n': return val.v;
-    		case 's': case 'str': return JSON.stringify(val.v);
-    		default: throw 'unrecognized type ' + val.t;
-    	}
-    }
-	if(sheet["!ref"]) {
-		var r = XLSX.utils.decode_range(sheet["!ref"]);
-		for(var R = r.s.r; R <= r.e.r; ++R) {
-			var row = [];
-			for(var C = r.s.c; C <= r.e.c; ++C) {
-				var val = sheet[XLSX.utils.encode_cell({c:C,r:R})];
-				row.push(val ? stringify(val) : "");
-			}
-			out.innerText += (row.join(",") + "\n");
-		}
-	}
+	return XLSX.utils.sheet_to_csv(sheet);
 }
 
 var drop = document.getElementById('drop');
@@ -75,11 +58,13 @@ function handleDrop(e) {
 		reader.onload = function(e) {
 			var data = e.target.result;
 			var xlsx = XLSX.read(data, {type: 'binary'});
-            if(get_radio_value("format") === "json"){
-                out.innerText = JSON.stringify(to_json(xlsx), 2, 2);
-            } else {
-                to_csv(xlsx.Sheets[xlsx.SheetNames[0]]);
-            }
+			var output = "";
+			if(get_radio_value("format") === "json"){
+				output = JSON.stringify(to_json(xlsx), 2, 2);
+			} else {
+				output = to_csv(xlsx.Sheets[xlsx.SheetNames[0]]);
+			}
+			out.innerText = output;
 		};
 		reader.readAsBinaryString(f);
 	}
diff --git a/xlsx.js b/xlsx.js
index 48bdc05..b2e6292 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -363,6 +363,29 @@ function sheet_to_row_object_array(sheet){
 	return outSheet;
 }
 
+function sheet_to_csv(sheet) {
+	var stringify = function stringify(val) {
+		switch(val.t){
+			case 'n': return val.v;
+			case 's': case 'str': return JSON.stringify(val.v);
+			default: throw 'unrecognized type ' + val.t;
+		}
+	}
+	var out = "";
+	if(sheet["!ref"]) {
+		var r = utils.decode_range(sheet["!ref"]);
+		for(var R = r.s.r; R <= r.e.r; ++R) { 
+			var row = [];
+			for(var C = r.s.c; C <= r.e.c; ++C) {
+				var val = sheet[utils.encode_cell({c:C,r:R})];
+				row.push(val ? stringify(val) : "");
+			}
+			out += row.join(",") + "\n";
+		}
+	}
+	return out;
+}
+
 var utils = {
 	encode_col: encode_col,
 	encode_row: encode_row,
@@ -372,6 +395,7 @@ var utils = {
 	split_cell: split_cell,
 	decode_cell: decode_cell,
 	decode_range: decode_range,
+	sheet_to_csv: sheet_to_csv,
 	sheet_to_row_object_array: sheet_to_row_object_array
 };