diff --git a/TestWindows/TestWindows.cpp b/TestWindows/TestWindows.cpp
index 3eca5f8..8c64243 100644
--- a/TestWindows/TestWindows.cpp
+++ b/TestWindows/TestWindows.cpp
@@ -3,6 +3,7 @@
 
 #include <iostream>
 #include <string>
+#include <iomanip>
 
 #include "firedog.h"
 #include "featurelibrary.h"
@@ -11,9 +12,13 @@
 
 #include "stringutil.h"
 
+#include "json/json-schema/json-schema.hpp"
+
 using namespace std;
 using namespace firedog;
 
+using nlohmann::json;
+using nlohmann::json_schema::json_validator;
 
 void testOutPut() {
 	string hexstr = "hello";
@@ -53,13 +58,15 @@ void testMatcher() {
         }
 	)";
 
+    const char* featureLibraryJson_error = "";
+
     //bytes
 	const string bytes = "fire dog hello world.";
 
     int ecode = NO_ERROR;
 
 	//step1: init feature library
-    FeatureLibrary featureLibrary = FeatureLibrary::createByJson(featureLibraryJson, &ecode);
+    FeatureLibrary featureLibrary = FeatureLibrary::createByJson(featureLibraryJson_error, &ecode);
 
     if (ecode != NO_ERROR) {
         cout << "feature library load faild";
@@ -126,9 +133,93 @@ void converter() {
     hexData = NULL;
 }
 
+
+void testJsonSchema() {
+    const string person_schema_json = R"(
+        {
+            "$schema": "http://json-schema.org/draft-07/schema#",
+            "title": "A person",
+            "properties": {
+                "name": {
+                    "description": "Name",
+                    "type": "string"
+                },
+                "age": {
+                    "description": "Age of the person",
+                    "type": "number",
+                    "minimum": 2,
+                    "maximum": 200
+                }
+            },
+            "required": [
+                         "name",
+                         "age"
+                         ],
+            "type": "object"
+        }
+
+    )";
+
+    json person_schema = json::parse(person_schema_json);
+
+    string schema = person_schema["$schema"];
+
+    json_validator validator; // create validator
+    try {
+        validator.set_root_schema(person_schema); // insert root-schema
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Validation of schema failed, here is why: " << e.what() << "\n";
+        return;
+    }
+
+    json bad_person = { {"age", 42} };
+    json good_person = { {"name", "Albert"}, {"age", 42} };
+
+    /* json-parse the people - API of 1.0.0, default throwing error handler */
+
+    for (auto& person : { bad_person, good_person }) {
+        std::cout << "About to validate this person:\n"
+            << std::setw(2) << person << std::endl;
+        try {
+            validator.validate(person); // validate the document - uses the default throwing error-handler
+            std::cout << "Validation succeeded\n";
+        }
+        catch (const std::exception& e) {
+            std::cerr << "Validation failed, here is why: " << e.what() << "\n";
+        }
+    }
+
+    /* json-parse the people - with custom error handler */
+    class custom_error_handler : public nlohmann::json_schema::basic_error_handler
+    {
+        void error(const nlohmann::json_pointer<nlohmann::basic_json<>>& pointer, const json& instance,
+            const std::string& message) override
+        {
+            nlohmann::json_schema::basic_error_handler::error(pointer, instance, message);
+            std::cerr << "ERROR: '" << pointer << "' - '" << instance << "': " << message << "\n";
+        }
+    };
+
+
+    for (auto& person : { bad_person, good_person }) {
+        std::cout << "About to validate this person:\n"
+            << std::setw(2) << person << std::endl;
+
+        custom_error_handler err;
+        validator.validate(person, err); // validate the document
+
+        if (err)
+            std::cerr << "Validation failed\n";
+        else
+            std::cout << "Validation succeeded\n";
+    }
+}
+
 int main()
 {
     //testMatcher();
-    converter();
+    //converter();
+    testJsonSchema();
     return 0;
 }
\ No newline at end of file