diff --git a/src/inc/api.php b/src/inc/api.php
new file mode 100644
index 0000000..9b606be
--- /dev/null
+++ b/src/inc/api.php
@@ -0,0 +1,28 @@
+<?php
+class api {
+  public static function inputJson() {
+    $string = trim(file_get_contents("php://input"));
+
+    if (empty($string)) return false;
+
+    $json = json_decode($string, true);
+
+    if (json_last_error() !== JSON_ERROR_NONE) return false;
+
+    return $json;
+  }
+
+  public static function error($message = null) {
+    if ($message !== null) self::write([
+      'error' => true,
+      'message' => $message,
+    ]);
+    http_response_code(400);
+    exit();
+  }
+
+  public static function write($array) {
+    header('Content-Type: application/json');
+    echo json_encode($array);
+  }
+}