diff --git a/src/client/client.ts b/src/client/client.ts
index 719b172..0f5fdb9 100644
--- a/src/client/client.ts
+++ b/src/client/client.ts
@@ -142,7 +142,7 @@ router.get(
     const dataString = JSON.stringify(data)
     const buffer = Buffer.from(dataString)
     const size = buffer.length
-    res.status(200).setHeader('X-File-Size', size).send(buffer)
+    res.status(200).setHeader('X-File-Size', size).setHeader('Content-Type', 'application/json').send(buffer)
   }
 )