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Can somebody explain how to run my reactJS app on port 80, without specifying port

currently it works on www.mydomain.com:3001 but I want it to be visible when I go to www.mydomain.com

I can't find the solution on create-react-app docs website so I'm asking here.

If I run application with 

sudo npm start

I get error that something is already using port 80 (I did specify PORT= 80)

Thanks

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    By default npm does not have root privilege. That means, If you try to run any application which uses port below than 1024 port, you need a sudo access. If that is the case, you can run your create-react-app with sudo PORT=80 npm start. That should do the job. Hope this helps Commented Feb 13, 2018 at 8:59

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you have to specify PORT env variable to run on port 80 PORT=80 npm run start

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5 Comments

This doesn't work on Windows environments.
On windows, set PORT=80 should do the same thing
using sudo PORT=80 npm run start
you can use npm run build command to build a production-ready app. You can host the folder created inside build directory to nginx or any other server which can run it on port 80.
It's a really bad idea to run npm with sudo privilege. Better to run a local tunnel from react server's port to port 80, that way only the tunnel needs sudo.

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