diff --git a/examples/excel2json/excel2json.js b/examples/excel2json/excel2json.js
new file mode 100644
index 0000000..de09116
--- /dev/null
+++ b/examples/excel2json/excel2json.js
@@ -0,0 +1,100 @@
+const XLSX = require("xlsx");
+const fs = require("fs");
+
+// do export for excel to json output or data json object
+function _internalExport() {
+  const NAME = process.env.APP_NAME || "excel2json";
+  console.log("APP NAME =>", NAME, "\n");
+
+  // load from env
+  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";
+
+  // get mapper in string
+  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 = mapperString ? JSON.parse(mapperString) : {};
+  const configs = mapperJson.configs || {};
+  const columsData = mapperJson.data || undefined;
+
+  // read workbook from excel file
+  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) => {
+      _r[col.label] = row[col.dataIndex];
+    });
+
+    return _r;
+  });
+
+  // parse a new path
+  const outputPath = configs.outputPath || OUTPUT_PATH;
+
+  // check directory and create it if not exist
+  if (!fs.existsSync(outputPath)) {
+    fs.mkdirSync(outputPath, { recursive: true });
+  }
+
+  // able to save to output or not (default is true)
+  const saveToOutput = configs.saveToOutput || true;
+
+  if (saveToOutput) {
+    // json data output
+    const jsonStringData = JSON.stringify(data);
+
+    try {
+      // write to file
+      fs.writeFileSync(
+        `${outputPath}/${
+          configs.outputName || "exported"
+        }_${new Date().getTime()}.json`,
+        jsonStringData,
+        (err) => {
+          if (err) throw err;
+          console.log("Write succeed!");
+        }
+      );
+    } catch (err) {}
+  }
+
+  return data;
+}
+
+/**
+ * excel2json
+ * Allow to export data from excel to json object or output of json.
+ * 
+ * @returns JSON Object of result
+ */
+module.exports = excel2json = () => {
+  return _internalExport()
+}
\ No newline at end of file
diff --git a/examples/excel2json/index.js b/examples/excel2json/index.js
index 37aa51e..4bca17e 100644
--- a/examples/excel2json/index.js
+++ b/examples/excel2json/index.js
@@ -1,68 +1,8 @@
-const XLSX = require("xlsx");
-const fs = require("fs");
+// import excel2json module
+const excel2json = require("./excel2json");
 
-const NAME = process.env.APP_NAME || "excel2json";
-console.log("App Name =>", NAME);
+// called function export excel2json
+const exported = excel2json();
 
-// load from env
-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";
-
-// get mapper in string
-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 = mapperString ? JSON.parse(mapperString) : {};
-const configs = mapperJson.configs || {};
-const columsData = mapperJson.data || undefined;
-
-// read workbook from excel file
-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) => {
-    _r[col.label] = row[col.dataIndex];
-  });
-
-  return _r;
-});
-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(outputPath)) {
-  fs.mkdirSync(outputPath, { recursive: true });
-}
-
-// write to file
-fs.writeFileSync(
-  `${outputPath}/${configs.outputName || 'exported'}_${new Date().getTime()}.json`,
-  JSON.stringify(data),
-  (err) => {
-    if (err) throw err;
-    console.log("Write succeed!");
-  }
-);
+// output data from exported
+console.log("Output =>\n", exported);
diff --git a/examples/excel2json/package.json b/examples/excel2json/package.json
index 5c8dd88..bfc11ea 100644
--- a/examples/excel2json/package.json
+++ b/examples/excel2json/package.json
@@ -4,6 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
+    "start": "node index.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "Sambo Chea <sombochea@cubetiqs.com>",