implement db4 with db

server_test.js

@@ -26,6 +26,8 @@ let allowCrossDomain = function(req, res, next) {
   app.use(allowCrossDomain);
  app.listen(PORT, () => console.log(`Listening on ${ PORT }`));
 
+ const db4=db;
+ 
 const PREFIX=""
 
 const ENDPOINTDATA=[