diff --git a/htdocs/api/index.php b/htdocs/api/index.php
index 2ed7d2e08f8..880d3263aaa 100644
--- a/htdocs/api/index.php
+++ b/htdocs/api/index.php
@@ -55,6 +55,12 @@ if (!empty($_SERVER['HTTP_DOLAPIENTITY'])) {
 	define("DOLENTITY", (int) $_SERVER['HTTP_DOLAPIENTITY']);
 }
 
+// When we request url to get the json file, we accept Cross site so we can include the descriptor into an external tool.
+if (preg_match('/\/explorer\/swagger\.json/', $_SERVER["PHP_SELF"])) {
+	header('Access-Control-Allow-Origin: *');
+	header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE');
+	header('Access-Control-Allow-Headers: Content-Type, Authorization, api_key, DOLAPIKEY');
+}
 
 $res = 0;
 if (!$res && file_exists("../main.inc.php")) {