diff --git a/src/Bridge/Symfony/Bundle/Test/ApiTestAssertionsTrait.php b/src/Bridge/Symfony/Bundle/Test/ApiTestAssertionsTrait.php
index 4375dcbaf19..97304347755 100644
--- a/src/Bridge/Symfony/Bundle/Test/ApiTestAssertionsTrait.php
+++ b/src/Bridge/Symfony/Bundle/Test/ApiTestAssertionsTrait.php
@@ -29,25 +29,45 @@ trait ApiTestAssertionsTrait
 
     /**
      * Asserts that the retrieved JSON contains has the specified subset.
+     *
      * This method delegates to self::assertArraySubset().
      *
+     * @param array|string $subset
+     *
      * @throws \Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface
      * @throws \Symfony\Contracts\HttpClient\Exception\DecodingExceptionInterface
      * @throws \Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface
      * @throws \Symfony\Contracts\HttpClient\Exception\ServerExceptionInterface
      * @throws \Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface
      */
-    public static function assertJsonContains(array $subset, bool $checkForObjectIdentity = true, string $message = ''): void
+    public static function assertJsonContains($subset, bool $checkForObjectIdentity = true, string $message = ''): void
     {
+        if (\is_string($subset)) {
+            $subset = json_decode($subset, true);
+        }
+        if (!\is_array($subset)) {
+            throw new \InvalidArgumentException('$subset must be array or string (JSON array or JSON object)');
+        }
+
         static::assertArraySubset($subset, self::getHttpResponse()->toArray(false), $checkForObjectIdentity, $message);
     }
 
     /**
-     * Asserts that the retrieved JSON is equal to the following array.
+     * Asserts that the retrieved JSON is equal to $json.
+     *
      * Both values are canonicalized before the comparision.
+     *
+     * @param array|string $json
      */
-    public static function assertJsonEquals(array $json, string $message = ''): void
+    public static function assertJsonEquals($json, string $message = ''): void
     {
+        if (\is_string($json)) {
+            $json = json_decode($json, true);
+        }
+        if (!\is_array($json)) {
+            throw new \InvalidArgumentException('$json must be array or string (JSON array or JSON object)');
+        }
+
         static::assertEqualsCanonicalizing($json, self::getHttpResponse()->toArray(false), $message);
     }
 
diff --git a/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php b/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php
index 24345839f11..8fe4b94f0c6 100644
--- a/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php
+++ b/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php
@@ -29,6 +29,37 @@ public function testAssertJsonContains(): void
         $this->assertJsonContains(['@context' => '/contexts/Entrypoint']);
     }
 
+    public function testAssertJsonContainsWithJsonObjectString(): void
+    {
+        if (version_compare(Version::id(), '8.0.0', '<')) {
+            $this->markTestSkipped('Requires PHPUnit 8');
+        }
+
+        self::createClient()->request('GET', '/');
+        $this->assertJsonContains(<<<JSON
+{
+    "@context": "/contexts/Entrypoint"
+}
+JSON
+        );
+    }
+
+    public function testAssertJsonContainsWithJsonScalarString(): void
+    {
+        if (version_compare(Version::id(), '8.0.0', '<')) {
+            $this->markTestSkipped('Requires PHPUnit 8');
+        }
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$subset must be array or string (JSON array or JSON object)');
+
+        self::createClient()->request('GET', '/');
+        $this->assertJsonContains(<<<JSON
+"/contexts/Entrypoint"
+JSON
+        );
+    }
+
     public function testAssertJsonEquals(): void
     {
         self::createClient()->request('GET', '/contexts/Address');
@@ -41,6 +72,33 @@ public function testAssertJsonEquals(): void
         ]);
     }
 
+    public function testAssertJsonEqualsWithJsonObjectString(): void
+    {
+        self::createClient()->request('GET', '/contexts/Address');
+        $this->assertJsonEquals(<<<JSON
+{
+    "@context": {
+        "@vocab": "http://example.com/docs.jsonld#",
+        "hydra": "http://www.w3.org/ns/hydra/core#",
+        "name": "Address/name"
+    }
+}
+JSON
+        );
+    }
+
+    public function testAssertJsonEqualsWithJsonScalarString(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$json must be array or string (JSON array or JSON object)');
+
+        self::createClient()->request('GET', '/contexts/Address');
+        $this->assertJsonEquals(<<<JSON
+"Address/name"
+JSON
+        );
+    }
+
     public function testAssertMatchesJsonSchema(): void
     {
         $jsonSchema = <<<JSON