diff --git a/examples/excel2json/README.md b/examples/excel2json/README.md
index 4f54107..e64bb72 100644
--- a/examples/excel2json/README.md
+++ b/examples/excel2json/README.md
@@ -1,17 +1,22 @@
-# Excel 2 Json
+# excel2json
+
 - Read file excel to json
-- Custom mapping with custom columns
+- Custom mapping with custom columns and configs
 
 # Build
+
 ```shell
 bash build
 ```
+
 OR
+
 ```shell
 make build run
 ```
 
 # Example
+
 ```shell
 docker run -v /my/path:/app/data --rm -it cubetiq/node-excel2json
 ```
@@ -21,6 +26,7 @@ docker run -v /home/sombochea/excel2json:/app/data -e APP_NAME="EXCEL 2 JSON" -e
 ```
 
 # Mapper Config
+
 ```json
 {
   "data": [
@@ -33,11 +39,16 @@ docker run -v /home/sombochea/excel2json:/app/data -e APP_NAME="EXCEL 2 JSON" -e
       "label": "Age"
     }
   ],
-  "configs": {}
+  "configs": {
+    "outputPath": "./data/outputs/exported",
+    "outputName": "my_exported_data",
+    "sheetName": "Sheet1"
+  }
 }
 ```
 
 # Environment
+
 ```env
 APP_NAME=custom app name
 INPUT_FILE=./data/mydata.xlsx
diff --git a/examples/excel2json/data/mapper.json b/examples/excel2json/data/mapper.json
index 1995182..3e1d9e2 100644
--- a/examples/excel2json/data/mapper.json
+++ b/examples/excel2json/data/mapper.json
@@ -9,5 +9,9 @@
       "label": "Age"
     }
   ],
-  "configs": {}
+  "configs": {
+    "outputPath": "./data/outputs/exported",
+    "outputName": "my_exported_data",
+    "sheetName": "Sheet1"
+  }
 }
diff --git a/examples/excel2json/index.js b/examples/excel2json/index.js
index 26a72a2..37aa51e 100644
--- a/examples/excel2json/index.js
+++ b/examples/excel2json/index.js
@@ -8,29 +8,37 @@ console.log("App Name =>", NAME);
 const INPUT_FILE = process.env.INPUT_FILE || "./data/people.xlsx";
 const OUTPUT_PATH = process.env.OUTPUT_PATH || "./data/outputs";
 const MAPPER_FILE = process.env.MAPPER_FILE || "./data/mapper.json";
-const SHEET_NAME = process.env.SHEET_NAME || "Sheet1"
-const ENCODING = process.env.ENCODING || "utf-8"
+const SHEET_NAME = process.env.SHEET_NAME || "Sheet1";
+const ENCODING = process.env.ENCODING || "utf-8";
 
 // get mapper in string
-const mapperString = fs.readFileSync(
-  MAPPER_FILE,
-  { encoding: ENCODING },
-  (err) => {
-    if (err) throw err;
+var mapperString = undefined;
+try {
+  mapperString = fs.readFileSync(MAPPER_FILE, { encoding: ENCODING }, (err) => {
+    if (err) {
+      console.error(err);
+    }
     console.log("Load file suceed =>", MAPPER_FILE);
-  }
-);
+  });
+} catch (err) {
+  console.error("read file error", err)
+}
 
 // convert mapper from string to json object
-const mapperJson = JSON.parse(mapperString);
-const columsData = mapperJson.data;
+const mapperJson = mapperString ? JSON.parse(mapperString) : {};
+const configs = mapperJson.configs || {};
+const columsData = mapperJson.data || undefined;
 
 // read workbook from excel file
-const wb = XLSX.readFile(INPUT_FILE);
-const xlData = XLSX.utils.sheet_to_json(wb.Sheets[SHEET_NAME]);
+const wb = XLSX.readFile(configs.inputFile || INPUT_FILE);
+const xlData = XLSX.utils.sheet_to_json(wb.Sheets[configs.sheetName || SHEET_NAME]);
 
 // mapping the data from read excel file
 const data = xlData.map((row) => {
+  if (columsData == undefined || !columsData) {
+    return row;
+  }
+
   var _r = {};
 
   columsData.map((col) => {
@@ -41,13 +49,20 @@ const data = xlData.map((row) => {
 });
 console.log("Data read from excel and mapped\n", data);
 
+// parse a new path
+const outputPath = configs.outputPath || OUTPUT_PATH
+
 // check directory and create it if not exist
-if (!fs.existsSync(OUTPUT_PATH)) {
-  fs.mkdirSync(OUTPUT_PATH);
+if (!fs.existsSync(outputPath)) {
+  fs.mkdirSync(outputPath, { recursive: true });
 }
 
 // write to file
-fs.writeFile(`${OUTPUT_PATH}/people_${new Date().getTime()}.json`, JSON.stringify(data), (err) => {
-  if (err) throw err;
-  console.log("Write succeed!");
-});
+fs.writeFileSync(
+  `${outputPath}/${configs.outputName || 'exported'}_${new Date().getTime()}.json`,
+  JSON.stringify(data),
+  (err) => {
+    if (err) throw err;
+    console.log("Write succeed!");
+  }
+);