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Error: listen eacces

Did you try running your application on port# < 1024 and faced the following error?

Error: listen EACCES
It means you do not have enough permission to listen on port# < 1024. If you run the same command with elevated privilages then you should not see that error. If you are on *nix based system using sudo before your command should resolve this issue. For example, using following command allowed me to host my application on port# 443
sudo npm start