How can I use port 80 instead of 3000?

Question

My app uses port 80, but heroku does not let my app access port 80. So, I used 3000 and ran it.

However, now, I cannot access it because port 3000 is not accessible in heroku. How can my app gain access to heroku?

Does this answer your question? [How to make the webpack dev server run on port 80 and on 0.0.0.0 to make it publicly accessible?](https://stackoverflow.com/questions/33272967/how-to-make-the-webpack-dev-server-run-on-port-80-and-on-0-0-0-0-to-make-it-publ) — Osama Rizwan, Jan 04 '21 at 05:15

KiraLT · Accepted Answer · 2021-01-03T19:43:43.650

1

First of all, I think this is a misunderstanding regarding ports. Your app will run behind the proxy (aka load balancer), so you don't actually need to specify use 80 port (and you can't). Heroku provides env variable PORT and you must use that port to start your application. Heroku proxy runs on 80 port (and 443, which supports SSL) and redirect all traffic to PORT port.

Your Node.js app is improperly configured to bind to a port other than the one provided by Heroku via the $PORT environment variable.

Example:

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
    console.log(`Our app is running on port ${ PORT }`);
});

Ref: Why is my Node.js app crashing with an R10 error?

edited Jan 03 '21 at 19:43

answered Jan 03 '21 at 19:30

KiraLT

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well i created the env var and nothing – RoboticObsession Jan 03 '21 at 21:10
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@RoboticObsession, you set `PORT`? That's not how this works. The `PORT` environment variable _will automatically be set **for you** by Heroku_. You just need to bind to it. – ChrisGPT was on strike Jan 04 '21 at 00:03

score 0 · Answer 2 · answered Jan 03 '21 at 17:38

0

Simple answer is you can't.

Heroku doesn't allow you to assign listening ports to your web apps directly. Your web apps are self contained and they will be assigned a dynamic port by Heroku. The only way to access that is to use the default port (80).

answered Jan 03 '21 at 17:38

ishandeveloper

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so how can i use the port 80 in heroku and node.js? – RoboticObsession Jan 03 '21 at 17:44
You can use environment variable like this to make your app run on the port opened by heroku. ```port = process.env.PORT || 80``` – ishandeveloper Jan 03 '21 at 17:48
yes but heroku don't lets me acces that port – RoboticObsession Jan 03 '21 at 17:48
the error is toot much text so i will put the important thing `Error: listen EACCES: permission denied 0.0.0.0:80` – RoboticObsession Jan 03 '21 at 17:53

How can I use port 80 instead of 3000?

2 Answers2