diff --git a/index.js b/index.js
index 9b026da..9b43592 100644
--- a/index.js
+++ b/index.js
@@ -143,3 +143,18 @@ exports.csvStringToJson = function(csvString) {
 exports.jsonToCsv = function(inputFileName, outputFileName) {
   csvToJson.generateJsonFileFromCsv(inputFileName, outputFileName);
 };
+
+
+/**
+ * map through individual row.
+ * @param {callback} function takes
+ * callback @param {header} the header or key
+ * callback @param {value} value/data
+ *
+ */
+
+exports.map = function(callback) {
+  // callback = function(header, value, index){  }
+  csvToJson.map(callback)
+  return this
+}
diff --git a/src/csvToJson.js b/src/csvToJson.js
index 8628777..a9f196a 100644
--- a/src/csvToJson.js
+++ b/src/csvToJson.js
@@ -59,6 +59,13 @@ class CsvToJson {
     for (let i = 1; i < lines.length; i++) {
       let currentLine = lines[i].split(fieldDelimiter);
       if (stringUtils.hasContent(currentLine)) {
+
+        if (this.mapCallback && typeof this.mapCallback === 'function') {
+          const data = this.buildJsonResult(headers, currentLine)
+          jsonResult.push(this.mapCallback(headers, data, i));
+
+          continue
+        }
         jsonResult.push(this.buildJsonResult(headers, currentLine));
       }
     }
@@ -115,6 +122,11 @@ class CsvToJson {
     return false;
   }
 
+  map(callback) {
+    this.mapCallback = callback
+  }
+
+
 }
 
 module.exports = new CsvToJson();