diff --git a/bin/json-graphql-server.js b/bin/json-graphql-server.js
index a487812..3543beb 100755
--- a/bin/json-graphql-server.js
+++ b/bin/json-graphql-server.js
@@ -4,11 +4,18 @@ var path = require('path');
 var express = require('express');
 var cors = require('cors');
 var JsonGraphqlServer = require('../lib/json-graphql-server.node.min').default;
-
+var fs = require('fs');
+var path = require('path');
+ 
 var dataFilePath = process.argv.length > 2 ? process.argv[2] : './data.json';
 var data = require(path.join(process.cwd(), dataFilePath));
 var PORT = process.env.NODE_PORT || 3000;
 var HOST = process.env.NODE_HOST || 'localhost';
+var PERSISTENT = process.env.NODE_PERSISTENT || false;
+var PERSITENT_DIR = process.env.NODE_PERSITENT_DIR || ".";
+var KEEP_CHANGE_HISTORY = process.env.NODE_KEEP_CHANGE_HISTORY || false;
+var VERBOSE = process.env.NODE_VERBOSE || false;
+
 var app = express();
 
 process.argv.forEach((arg, index) => {
@@ -20,11 +27,78 @@ process.argv.forEach((arg, index) => {
     if (arg === '--h' && process.argv.length > index + 1) {
         HOST = process.argv[index + 1];
     }
+	if (arg === '--persistent-dir' && process.argv.length > index + 1) {
+        PERSITENT_DIR = process.argv[index + 1];
+    }
+    if (arg === '--persistent') {
+        PERSISTENT = true;
+    }
+	if (arg === '--keep-change-history') {
+        KEEP_CHANGE_HISTORY = true;
+    }
+	if (arg === '--verbose') {
+        VERBOSE = true;
+    }
+
 });
+app.use(function(req, res, next) {
+	if (VERBOSE == true){
+		console.log("before", data);
+	}
+	fs.readdir(".", (err, files) => {
+		files.forEach(file => {
+		  console.log(file);
+		});
+	  });
+    res.on("finish", function() {
+		if (VERBOSE == true){
+			console.log("after", data);
+		}    	    
+		if (PERSISTENT == true){
+			var json = JSON.stringify(data);
+			if (VERBOSE == true){
+	        	console.log("File content will be :", json);
+			}
+			
+			if(KEEP_CHANGE_HISTORY == true){
+				var destFile = dataFilePath.replace(/^.*[\\\/]/, '')
+				var timestamp = Date.now()
+				var destFilename = destFile.concat("-",timestamp)
+				var backupDirFilename = path.join(PERSITENT_DIR, destFilename);
+				console.log(backupDirFilename)
+				fs.copyFile(dataFilePath, backupDirFilename, (err) => {
+					if (err) {
+        				console.error(err);
+        				return;
+    				};
+					console.log('File was copied to ' + backupDirFilename );
 
+				});
+			}
+			
+			fs.writeFile(dataFilePath, json, 'utf8',
+				function(err) {
+	    			if (err) {
+        				console.error(err);
+        				return;
+    				};
+    				console.log("File " + dataFilePath + " has been updated");
+    			}
+			);
+	    }
+    });
+    next();
+  });
+  
 app.use(cors());
 app.use('/', JsonGraphqlServer(data));
 app.listen(PORT, HOST);
+if (PERSISTENT==true){
+	console.log("Your data will be saved in " + dataFilePath)
+}
+if (KEEP_CHANGE_HISTORY==true){
+	console.log("Your data changes will be saved in " + PERSITENT_DIR)
+}
 var msg = `GraphQL server running with your data at http://${HOST}:${PORT}/`;
 console.log(msg); // eslint-disable-line no-console
 
@@ -32,3 +106,4 @@ process.on('unhandledRejection', (reason, p) => {
     // eslint-disable-next-line no-console
     console.log('Unhandled Rejection at: Promise', p, 'reason:', reason);
 });
+