diff --git a/JFile.cpp b/JFile.cpp
new file mode 100644
index 0000000..4cfac59
--- /dev/null
+++ b/JFile.cpp
@@ -0,0 +1,10 @@
+#include "JFile.h"
+#include "ZString.h"
+#include "Exception.h"
+
+namespace coreutils {
+
+   JFile::JFile(ZString filename) : MFile(filename) {}
+      
+   
+}
diff --git a/JFile.h b/JFile.h
new file mode 100644
index 0000000..8dc3a99
--- /dev/null
+++ b/JFile.h
@@ -0,0 +1,25 @@
+#ifndef __JFile_h__
+#define __JFile_h__
+
+#include "JString.h"
+#include "MFile.h"
+
+namespace coreutils {
+
+   ///
+   /// Use the JFile object to create a JSON object that uses a file for its backing store.
+   /// The file name is provided at construction time. Contents of the file are updated
+   /// when the object is changed or the at the end of scope for the object. 
+   ///
+   
+   class JFile : public MFile, public JString {
+
+    public:
+
+      JFile(ZString filename);      
+      
+   };
+
+}
+
+#endif
diff --git a/JString.h b/JString.h
index 0890c0d..14f59e7 100644
--- a/JString.h
+++ b/JString.h
@@ -28,7 +28,7 @@ namespace coreutils {
    ///       std::cout << jstring["key"];
    ///
 
-   class JString : public MString {
+   class JString : virtual public MString {
 
     public:
 
diff --git a/MFile.h b/MFile.h
index 25e9384..2d47f32 100644
--- a/MFile.h
+++ b/MFile.h
@@ -13,7 +13,7 @@
 
 namespace coreutils {
 
-   class MFile : public MString {
+   class MFile : virtual public MString {
 
     public:
       MFile(MString fileName);
diff --git a/testing/compile b/testing/compile
index b305a03..9bf376e 100755
--- a/testing/compile
+++ b/testing/compile
@@ -3,3 +3,4 @@ g++ -g -std=c++20 -o zstring_test zstring_test.cpp -I.. -L.. -lCoreUtils
 g++ -g -std=c++20 -o mstring_test mstring_test.cpp -I.. -L.. -lCoreUtils -lb64
 g++ -o jstring_test jstring_test.cpp -I.. -L.. -lCoreUtils
 g++ -g -std=c++20 -o mfile_test mfile_test.cpp -I.. -L.. -lCoreUtils
+g++ -g -std=c++20 -o jfile_test jfile_test.cpp -I.. -L.. -lCoreUtils
diff --git a/testing/jfile_test.cpp b/testing/jfile_test.cpp
new file mode 100644
index 0000000..177add5
--- /dev/null
+++ b/testing/jfile_test.cpp
@@ -0,0 +1,68 @@
+#include <iostream>
+#include "../JString.h"
+#include "../JFile.h"
+#include <string>
+#include <sstream>
+
+int main(int argc, char **argv) {
+
+   coreutils::MString test0("{ \"Number\": \"0\", \"id\": \"XXXXX\" }");
+   coreutils::JFile test1("jfile_test.data");
+   coreutils::JString test9;
+
+   test1 = test0;
+   std::cout << test1 << std::endl;
+
+   std::cout << test1["id"] << std::endl;
+   
+   test1["name"] = "Cohen";
+
+   std::cout << test1 << std::endl;
+
+   test1["health"] = "100";
+   test1["comment"] = "this is a comment";
+   test1["racex"] = "elvin";
+   test1["race"] = "human";
+   test1["array"] = "[\"test1\",\"test2\",\"test3\"]";
+   test1["tester"] = "test field";
+   test1["object1"] = "{\"attr1\":\"value1\",\"attr2\":\"value2\",\"attr3\":\"value3\"}";
+   test1["object1.attr2"] = "{\"xattr1\":\"xvalue1\",\"xattr2\":\"xvalue2\",\"xattr3\":\"xvalue3\"}";
+   test1["object1.attr3"] = "Im not an object";
+//   test1["age"] = 64; future
+
+   std::cout << test1 << std::endl;
+
+   coreutils::ZString test2 = test1["name"];
+   std::cout << test2 << std::endl;
+   
+   std::cout << test1["name"] << std::endl;
+   std::cout << test1["health"] << std::endl;
+   std::cout << test1["comment"] << std::endl;
+   std::cout << test1["racex"] << std::endl;
+   std::cout << test1["race"] << std::endl;
+   std::cout << test1["array"] << std::endl;
+   std::cout << test1["tester"] << std::endl;
+   std::cout << test1["object1"] << std::endl;
+   std::cout << test1["object1.attr2"] << std::endl;   
+   std::cout << test1["object1.attr2.xattr3"] << std::endl;   
+   std::cout << test1["object1.attr3"] << std::endl;   
+   std::cout << test1["array[0]"] << std::endl;   
+   std::cout << test1["array[1]"] << std::endl;   
+   std::cout << test1["array[2]"] << std::endl;   
+
+   std::string string1 = test1["tester"];
+   std::cout << "from string: " << string1 << std::endl;
+
+   coreutils::MString testout;
+   testout << "this is a test: " << test1["comment"];
+   std::cout << testout << std::endl;
+
+   test9 = test1["object1"];
+   std::cout << test9 << std::endl;
+   std::cout << test9["attr3"] << std::endl;
+
+   std::cout << test1.pretty() << std::endl;
+   
+   return 0;
+}
+
diff --git a/testing/jfile_test.data b/testing/jfile_test.data
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/testing/jfile_test.data
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/testing/jstring_test b/testing/jstring_test
index 74d88c6..689ee78 100755
Binary files a/testing/jstring_test and b/testing/jstring_test differ
diff --git a/testing/mfile_test b/testing/mfile_test
index e91b3a4..92678a8 100755
Binary files a/testing/mfile_test and b/testing/mfile_test differ