diff --git a/sapi/fuzzer/fuzzer-json.c b/sapi/fuzzer/fuzzer-json.c
index 0407a895835e..7ffa28df245a 100644
--- a/sapi/fuzzer/fuzzer-json.c
+++ b/sapi/fuzzer/fuzzer-json.c
@@ -27,6 +27,10 @@
 #include "ext/json/php_json.h"
 #include "ext/json/php_json_parser.h"
 
+/* Lower than the default depth of 512, so that deeply nested inputs fail quickly and the
+ * depth limit is reached with small inputs. */
+#define MAX_DEPTH 10
+
 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 
 	if (fuzzer_request_startup() == FAILURE){
@@ -55,10 +59,20 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 	for (int index = 0; index < 12; ++index) {
 		zval result;
 		php_json_parser parser;
-		php_json_parser_init(&parser, &result, data, Size, options[index], 10);
-		if (php_json_yyparse(&parser) == SUCCESS) {
+		php_json_parser_init(&parser, &result, data, Size, options[index], MAX_DEPTH);
+		bool decoded = php_json_yyparse(&parser) == SUCCESS;
+		if (decoded) {
 			zval_ptr_dtor(&result);
 		}
+
+		/* json_validate() must agree with json_decode(). Only compare when decoding to arrays,
+		 * as decoding to objects additionally rejects property names starting with a NUL byte. */
+		if (options[index] == PHP_JSON_OBJECT_AS_ARRAY
+				|| options[index] == (PHP_JSON_OBJECT_AS_ARRAY | PHP_JSON_INVALID_UTF8_IGNORE)) {
+			bool valid = php_json_validate_ex(data, Size,
+				options[index] & PHP_JSON_INVALID_UTF8_IGNORE, MAX_DEPTH);
+			ZEND_ASSERT(valid == decoded);
+		}
 	}
 
 	php_request_shutdown(NULL);