--- /dev/null
+<?php
+
+$requestBody = file_get_contents('php://input');
+
+$requestJson = json_decode($requestBody, true);
+
+if (empty($requestJson['index'])) {
+ throw new \Exception('index is required.');
+}
+
+$jsonFile = __DIR__.'/tablediffs.json';
+
+$demoStorage = json_decode(file_get_contents($jsonFile), true);
+
+if (!array_key_exists($requestJson['index'], $demoStorage)) {
+ throw new \Exception('index not found.');
+}
+
+$targetDemo = $demoStorage[$requestJson['index']];
+
+header('Content-Type: application/json');
+echo json_encode($targetDemo);