Mark JSON form data as application/json

Author: mstieranka

src/templates/core/functions/getFormData.hbs

@@ -6,7 +6,10 @@ const getFormData = (options: ApiRequestOptions): FormData | undefined => {
 			if (isString(value) || isBlob(value)) {
 				formData.append(key, value);
 			} else {
-				formData.append(key, JSON.stringify(value));
+				formData.append(
+					key,
+					new Blob([JSON.stringify(value)], { type: 'application/json' })
+				);
 			}
 		};