I recommend to use Firebase as Backend for small application and Node. JS as Backend for Larger Application in Flutter App Development. A flutter/dart package allows you to create a backend server.
Read moreCan Dart be used for server-side?
libraries. Shows how to use the major features of the dart:io library. You can use the dart:io library in command-line scripts, servers, and non-web Flutter apps .
Read moreIs Flutter a server-side?
What is Flutter? Flutter is an open-source UI toolkit originally launched for mobile app development. The Flutter framework has since expanded to include web app development support. Flutter code compiles into multiple client-side machine code languages .
Read moreWhich is best for backend?
Here are the details of the best backend frameworks.
Read moreIs Dart faster than NodeJS?
It’s actually faster than other compiled languages like Java. However, Dart proved to be much faster when benchmarked against JavaScript . You can refer to the benchmark of Dart against NodeJS here.
Read more