diff --git a/backend/src/index.ts b/backend/src/index.ts
index 09a12e200..cd81e4994 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -83,7 +83,7 @@ class Server {
         next();
       })
       .use(express.urlencoded({ extended: true }))
-      .use(express.text())
+      .use(express.text({ type: ['text/plain', 'application/base64'] }))
       ;
 
     this.server = http.createServer(this.app);