diff --git a/composer.json b/composer.json
index 5fb47bb..89aba31 100755
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,9 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0",
-		"friendsofphp/php-cs-fixer": "*"
+		"friendsofphp/php-cs-fixer": "*",
+        "tracy/tracy": "^2.7",
+        "nette/utils": "^3.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/demo.php b/demo.php
index efe9f4b..e3b09ad 100755
--- a/demo.php
+++ b/demo.php
@@ -32,13 +32,9 @@
 $script = $parser->parse($code, __FILE__);
 $traverser->traverse($script);
 
-if ($graphviz) {
-    $dumper = new PHPCfg\Printer\GraphViz();
-    echo $dumper->printScript($script);
-} else {
-    $dumper = new PHPCfg\Printer\Text();
-    echo $dumper->printScript($script);
-}
+$dumper = new PHPCfg\Printer\Json();
+//$dumper = new PHPCfg\Printer\Text();
+$data = $dumper->printScript($script);
 
 function getCode($argc, $argv)
 {
diff --git a/lib/PHPCfg/Printer/Json.php b/lib/PHPCfg/Printer/Json.php
new file mode 100755
index 0000000..92b0d2f
--- /dev/null
+++ b/lib/PHPCfg/Printer/Json.php
@@ -0,0 +1,106 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of PHP-CFG, a Control flow graph implementation for PHP
+ *
+ * @copyright 2015 Anthony Ferrara. All rights reserved
+ * @license MIT See LICENSE at the root of the project for more info
+ */
+
+namespace PHPCfg\Printer;
+
+use Nette\Utils\FileSystem;
+use PHPCfg\Func;
+use PHPCfg\Printer;
+use PHPCfg\Script;
+
+class Json extends Printer
+{
+    public function printScript(Script $script)
+    {
+        // 1. dummy approach
+//        $json = serialize($script);
+//        var_dump($json);
+//
+//        /** @var Script $recreateScript */
+//        $recreateScript = unserialize($json);
+//        dump($recreateScript->main->cfg);
+//        die;
+
+        $output = [];
+        $output[] = $this->printFunc($script->main);
+        foreach ($script->functions as $func) {
+            $name = $func->getScopedName();
+            $output[] = "\nFunction ${name}():";
+            $output[] = ' ' . $this->renderType($func->returnType);
+            $output[] = $this->printFunc($func);
+            $output['label'] = $this->printFunc($func);
+        }
+
+        // before (strings)
+        // $output[] = 'key: value';
+
+        // after (array)
+        // $output['key'] = 'value';
+
+        // array data
+        $jsonData = \Nette\Utils\Json::encode($output, \Nette\Utils\Json::PRETTY);
+
+        // 1. print
+        echo $jsonData;
+
+        // 2. save to a file
+        FileSystem::write('result.json', $jsonData);
+    }
+
+    public function printFunc(Func $func): array
+    {
+        $rendered = $this->render($func);
+        $output = [];
+        foreach ($rendered['blocks'] as $block) {
+            $ops = $rendered['blocks'][$block];
+            $output[] = "Block#".$rendered['blockIds'][$block];
+            foreach ($block->parents as $prev) {
+                if ($rendered['blockIds']->contains($prev)) {
+                    $output['Parent'] = "Block#".$rendered['blockIds'][$prev];
+                }
+            }
+            foreach ($ops as $op) {
+                $output['label'] = $op['label'];
+                foreach ($op['childBlocks'] as $child) {
+                    $output[] = $child['name'].': Block#'.$rendered['blockIds'][$child['block']];
+                }
+            }
+        }
+
+        return $output;
+    }
+
+    public function printVars(Func $func)
+    {
+        $rendered = $this->render($func);
+        $output = '';
+        foreach ($rendered['varIds'] as $var) {
+            $id = $rendered['varIds'][$var];
+            $output[] = "\nVar#${id}";
+            $output[] = $this->indent("\n".'WriteOps:');
+            foreach ($var->ops as $writeOp) {
+                if ($rendered['ops']->contains($writeOp)) {
+                    $output[] = $rendered['ops'][$writeOp]['label'];
+                }
+            }
+
+            $output[] = 'ReadOps:';
+            foreach ($var->usages as $usage) {
+                if ($rendered['ops']->contains($usage)) {
+                    $output[] = $this->indent("\n".$rendered['ops'][$usage]['label'], 2);
+                }
+            }
+            $output[] = "\n";
+        }
+
+        return $output;
+    }
+}
diff --git a/result.json b/result.json
new file mode 100644
index 0000000..74559db
--- /dev/null
+++ b/result.json
@@ -0,0 +1,16 @@
+{
+    "0": {
+        "0": "Block#1",
+        "label": "Terminal_Return"
+    },
+    "1": "\nFunction foo():",
+    "2": " mixed",
+    "3": {
+        "0": "Block#1",
+        "label": "Terminal_Return"
+    },
+    "label": {
+        "0": "Block#1",
+        "label": "Terminal_Return"
+    }
+}
\ No newline at end of file