diff --git a/src/Symfony/Component/HttpClient/Response/ResponseTrait.php b/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
index 000da5344dcf..595ac9737c07 100644
--- a/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
+++ b/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
@@ -147,21 +147,21 @@ public function toArray(bool $throw = true): array
         $contentType = $this->headers['content-type'][0] ?? 'application/json';
 
         if (!preg_match('/\bjson\b/i', $contentType)) {
-            throw new JsonException(sprintf('Response content-type is "%s" while a JSON-compatible one was expected.', $contentType));
+            throw new JsonException(sprintf('Response content-type is "%s" while a JSON-compatible one was expected for "%s".', $contentType, $this->getInfo('url')));
         }
 
         try {
             $content = json_decode($content, true, 512, JSON_BIGINT_AS_STRING | (\PHP_VERSION_ID >= 70300 ? JSON_THROW_ON_ERROR : 0));
         } catch (\JsonException $e) {
-            throw new JsonException($e->getMessage(), $e->getCode());
+            throw new JsonException(sprintf('%s for "%s".', $e->getMessage(), $this->getInfo('url')), $e->getCode());
         }
 
         if (\PHP_VERSION_ID < 70300 && JSON_ERROR_NONE !== json_last_error()) {
-            throw new JsonException(json_last_error_msg(), json_last_error());
+            throw new JsonException(sprintf('%s for "%s".', json_last_error_msg(), $this->getInfo('url')), json_last_error());
         }
 
         if (!\is_array($content)) {
-            throw new JsonException(sprintf('JSON content was expected to decode to an array, %s returned.', \gettype($content)));
+            throw new JsonException(sprintf('JSON content was expected to decode to an array, %s returned for "%s".', \gettype($content), $this->getInfo('url')));
         }
 
         if (null !== $this->content) {
diff --git a/src/Symfony/Component/HttpClient/Tests/Response/MockResponseTest.php b/src/Symfony/Component/HttpClient/Tests/Response/MockResponseTest.php
new file mode 100644
index 000000000000..61ceb913a93e
--- /dev/null
+++ b/src/Symfony/Component/HttpClient/Tests/Response/MockResponseTest.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace Symfony\Component\HttpClient\Tests\Response;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpClient\Exception\JsonException;
+use Symfony\Component\HttpClient\Response\MockResponse;
+
+/**
+ * Test methods from Symfony\Component\HttpClient\Response\ResponseTrait.
+ */
+class MockResponseTest extends TestCase
+{
+    public function testToArray()
+    {
+        $data = ['color' => 'orange', 'size' => 42];
+        $response = new MockResponse(json_encode($data));
+        $response = MockResponse::fromRequest('GET', 'https://example.com/file.json', [], $response);
+
+        $this->assertSame($data, $response->toArray());
+    }
+
+    /**
+     * @dataProvider toArrayErrors
+     */
+    public function testToArrayError($content, $responseHeaders, $message)
+    {
+        $this->expectException(JsonException::class);
+        $this->expectExceptionMessage($message);
+
+        $response = new MockResponse($content, ['response_headers' => $responseHeaders]);
+        $response = MockResponse::fromRequest('GET', 'https://example.com/file.json', [], $response);
+        $response->toArray();
+    }
+
+    public function toArrayErrors()
+    {
+        yield [
+            'content' => '{}',
+            'responseHeaders' => ['content-type' => 'plain/text'],
+            'message' => 'Response content-type is "plain/text" while a JSON-compatible one was expected for "https://example.com/file.json".',
+        ];
+
+        yield [
+            'content' => 'not json',
+            'responseHeaders' => [],
+            'message' => 'Syntax error for "https://example.com/file.json".',
+        ];
+
+        yield [
+            'content' => '[1,2}',
+            'responseHeaders' => [],
+            'message' => 'State mismatch (invalid or malformed JSON) for "https://example.com/file.json".',
+        ];
+
+        yield [
+            'content' => '"not an array"',
+            'responseHeaders' => [],
+            'message' => 'JSON content was expected to decode to an array, string returned for "https://example.com/file.json".',
+        ];
+
+        yield [
+            'content' => '8',
+            'responseHeaders' => [],
+            'message' => 'JSON content was expected to decode to an array, integer returned for "https://example.com/file.json".',
+        ];
+    }
+}