diff --git a/lib/json2xls.js b/lib/json2xls.js
index 616b606..a647819 100644
--- a/lib/json2xls.js
+++ b/lib/json2xls.js
@@ -1,9 +1,10 @@
+'use strict';
+
 var nodeExcel = require('excel-export');
 
 var transform = function(json,config) {
     var conf = transform.prepareJson(json,config);
-    var result = nodeExcel.execute(conf);
-    return result;
+    return nodeExcel.execute(conf);
 };
 
 //get a xls type based on js type
@@ -46,6 +47,15 @@ transform.prepareJson = function(json,config) {
     var conf = config||{};
     var jsonArr = [].concat(json);
     var fields = conf.fields || Object.keys(jsonArr[0]);
+    //use custom config or global config
+    var cols = conf.cols || fields.map(function () {
+        return {
+            captionStyleIndex: config.captionStyleIndex || 0,
+            cellType: config.cellType || null,
+            beforeCellWrite: config.beforeCellWrite || null,
+            width: config.width || 20
+        };
+    });
     var types = [];
     if (!(fields instanceof Array)) {
         types = Object.keys(fields).map(function(key) {
@@ -57,11 +67,13 @@ transform.prepareJson = function(json,config) {
     res.cols = fields.map(function(key,i) {
         return {
             caption: key,
-            type: getType(jsonArr[0][key],types[i]),
-            beforeCellWrite: function(row, cellData, eOpt){
+            captionStyleIndex: cols[i].captionStyleIndex,
+            type: cols[i].cellType || getType(jsonArr[0][key],types[i]),
+            beforeCellWrite: cols[i].beforeCellWrite || function (row, cellData, eOpt) {
                 eOpt.cellType = getType(cellData,types[i]);
                 return cellData;
-            }
+            },
+            width: cols[i].width
         };
     });
     //rows
@@ -83,6 +95,10 @@ transform.prepareJson = function(json,config) {
     if (conf.style) {
         res.stylesXmlFile = conf.style;
     }
+    //add name if provided
+    if (conf.name) {
+        res.name = conf.name;
+    }
     return res;
 };
 
@@ -90,7 +106,7 @@ transform.middleware = function(req,res,next) {
     res.xls = function(fn,data,config) {
         var xls = transform(data,config);
         res.setHeader('Content-Type', 'application/vnd.openxmlformats');
-        res.setHeader("Content-Disposition", "attachment; filename=" + fn);
+        res.setHeader('Content-Disposition', 'attachment; filename=' + fn);
         res.end(xls, 'binary');
     };
     next();