diff --git a/src/Symfony/Component/ErrorCatcher/ErrorRenderer/JsonErrorRenderer.php b/src/Symfony/Component/ErrorCatcher/ErrorRenderer/JsonErrorRenderer.php
index 395ac0f7e39bd..cd61300170e82 100644
--- a/src/Symfony/Component/ErrorCatcher/ErrorRenderer/JsonErrorRenderer.php
+++ b/src/Symfony/Component/ErrorCatcher/ErrorRenderer/JsonErrorRenderer.php
@@ -47,6 +47,6 @@ public function render(FlattenException $exception): string
             $content['exceptions'] = $exception->toArray();
         }
 
-        return (string) json_encode($content);
+        return (string) json_encode($content, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_LINE_TERMINATORS | JSON_PRESERVE_ZERO_FRACTION);
     }
 }
diff --git a/src/Symfony/Component/ErrorCatcher/Tests/ErrorRenderer/JsonErrorRendererTest.php b/src/Symfony/Component/ErrorCatcher/Tests/ErrorRenderer/JsonErrorRendererTest.php
index a4782ee264153..9b3848d945012 100644
--- a/src/Symfony/Component/ErrorCatcher/Tests/ErrorRenderer/JsonErrorRendererTest.php
+++ b/src/Symfony/Component/ErrorCatcher/Tests/ErrorRenderer/JsonErrorRendererTest.php
@@ -20,7 +20,17 @@ class JsonErrorRendererTest extends TestCase
     public function testRender()
     {
         $exception = FlattenException::createFromThrowable(new \RuntimeException('Foo'));
-        $expected = '{"title":"Internal Server Error","status":500,"detail":"Foo","exceptions":[{"message":"Foo","class":"RuntimeException","trace":';
+        $expected = <<<JSON
+{
+    "title": "Internal Server Error",
+    "status": 500,
+    "detail": "Foo",
+    "exceptions": [
+        {
+            "message": "Foo",
+            "class": "RuntimeException",
+            "trace":
+JSON;
 
         $this->assertStringStartsWith($expected, (new JsonErrorRenderer())->render($exception));
     }