Added pretty print option.

composer.json

@@ -13,7 +13,6 @@
             "role": "Developer"
         }
     ],
-
     "require": {
         "php": "^8.2",
         "symfony/http-kernel": "^6.0",
@@ -63,5 +62,18 @@
         "allow-plugins": {
             "phpstan/extension-installer": true
         }
+    },
+    "scripts": {
+        "cs-fixer": "vendor/bin/php-cs-fixer fix --diff --dry-run",
+        "psalm": "vendor/bin/psalm --config=psalm.xml",
+        "phpstan": "vendor/bin/phpstan analyse --memory-limit 2G -c phpstan.neon",
+        "rector": "vendor/bin/rector process --dry-run --config=rector.php",
+        "run-all": [
+            "@cs-fixer",
+            "@psalm",
+            "@phpstan",
+            "@rector",
+            "phpunit"
+        ]
     }
 }

src/Highcharts/AbstractChart.php

@@ -30,6 +30,7 @@ abstract class AbstractChart implements ChartInterface
     public ChartOption $lang;
     public ChartOption $legend;
     public ChartOption $plotOptions;
+    public bool $prettyPrint = false;
     public ChartOption $scrollbar;
     public array $series;
     public ChartOption $subtitle;
@@ -119,7 +120,7 @@ protected function jsonEncode(ChartOption|array $data, string $name = ''): strin
             return '';
         }
 
-        $encoded = \json_encode($data);
+        $encoded = \json_encode($data, $this->getJsonEncodeOptions());
 
         return self::SPACE . "$name: $encoded" . self::END_LINE;
     }
@@ -140,7 +141,7 @@ protected function renderCallback(ChartOption|array $data, string $name = ''): s
         }
 
         // Zend\Json is used in place of json_encode to preserve JS anonymous functions
-        $encoded = Json::encode(valueToEncode: $data, options: self::ZEND_ENCODE_OPTIONS);
+        $encoded = Json::encode(valueToEncode: $data, options: $this->getZendEncodeOptions());
 
         return self::SPACE . "$name: $encoded" . self::END_LINE;
     }
@@ -278,4 +279,14 @@ protected function renderYAxis(): string
     {
         return $this->renderCallback($this->yAxis, 'yAxis');
     }
+
+    private function getJsonEncodeOptions(): int
+    {
+        return $this->prettyPrint ? \JSON_PRETTY_PRINT : 0;
+    }
+
+    private function getZendEncodeOptions(): array
+    {
+        return \array_merge(self::ZEND_ENCODE_OPTIONS, ['prettyPrint' => $this->prettyPrint]);
+    }
 }