Update

backend/app/config/checkFormat.config.js

@@ -0,0 +1,9 @@
+const {sendError} = require ("./response.config");
+
+function checkFormat(req, res){
+  if(req.get('Content-Type') !== 'application/json') {
+    return sendError(res, 401, -1, "Invalid header format (please use JSON)");
+  }
+  return true; // Is valid
+}
+module.exports = checkFormat