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I am trying to run a Node app on a newly created Heroku App from their web. I followed their steps and still I am getting errors when displaying app status.

I followed the Node.js getting started section without the heroku create mand since I already created from the web.

So when I run: heroku ps:scale web=1 it shows me:

Scaling dynos... done, now running web at 1:Free

But when running heroku ps:

=== web (Free): npm run start (1)

web.1: crashed 2018/10/25 11:25:49 -0300 (~ 8m ago)

So my logs on heroku logs --tail show me this error:

2018-10-25T14:25:44.000000+00:00 app[api]: Build succeeded

2018-10-25T14:25:46.451739+00:00 heroku[web.1]: Starting process with mand npm run start

2018-10-25T14:25:49.113832+00:00 app[web.1]:

2018-10-25T14:25:49.113864+00:00 app[web.1]: > [email protected] start /app

2018-10-25T14:25:49.113866+00:00 app[web.1]: > node server.js

2018-10-25T14:25:49.113867+00:00 app[web.1]:

2018-10-25T14:25:49.418151+00:00 app[web.1]: events.js:167

2018-10-25T14:25:49.418191+00:00 app[web.1]: throw er; // Unhandled 'error' event

2018-10-25T14:25:49.418193+00:00 app[web.1]: ^

2018-10-25T14:25:49.418194+00:00 app[web.1]:

2018-10-25T14:25:49.418196+00:00 app[web.1]: Error: listen EACCES 0.0.0.0:80

So I checked if I made a mistake while setting all up.

I use a simple Express routing and server with this code:

app.get('/', (req, res) => { ... });
app.listen(80, err => {
    if(err) throw err;
    console.log("%c Server running", "color: green");
});

Also I made sure I added engines to package.json:

"scripts": {
    "start": "node server.js"
},
"engines": {
    "node": "10.11.0",
    "npm": "6.4.1"
},

I've also created a Procfile file in the root path with web: npm run start inside.

So when everything is checked I just run these mands and everything looks great until I check the logs or visit the app:

git mit -am "my mit text"
git push heroku master

I see this in the logs:

remote: -----> Compressing...

remote: Done: 18.3M

remote: -----> Launching...

remote: Released v12

remote: / deployed to Heroku

remote:

remote: Verifying deploy... done.

To .git

3656da0..f1eb078 master -> master

So... Any suggestions on what am I doing wrong? Thanks in advance.

I am trying to run a Node app on a newly created Heroku App from their web. I followed their steps and still I am getting errors when displaying app status.

I followed the Node.js getting started section without the heroku create mand since I already created from the web.

So when I run: heroku ps:scale web=1 it shows me:

Scaling dynos... done, now running web at 1:Free

But when running heroku ps:

=== web (Free): npm run start (1)

web.1: crashed 2018/10/25 11:25:49 -0300 (~ 8m ago)

So my logs on heroku logs --tail show me this error:

2018-10-25T14:25:44.000000+00:00 app[api]: Build succeeded

2018-10-25T14:25:46.451739+00:00 heroku[web.1]: Starting process with mand npm run start

2018-10-25T14:25:49.113832+00:00 app[web.1]:

2018-10-25T14:25:49.113864+00:00 app[web.1]: > [email protected] start /app

2018-10-25T14:25:49.113866+00:00 app[web.1]: > node server.js

2018-10-25T14:25:49.113867+00:00 app[web.1]:

2018-10-25T14:25:49.418151+00:00 app[web.1]: events.js:167

2018-10-25T14:25:49.418191+00:00 app[web.1]: throw er; // Unhandled 'error' event

2018-10-25T14:25:49.418193+00:00 app[web.1]: ^

2018-10-25T14:25:49.418194+00:00 app[web.1]:

2018-10-25T14:25:49.418196+00:00 app[web.1]: Error: listen EACCES 0.0.0.0:80

So I checked if I made a mistake while setting all up.

I use a simple Express routing and server with this code:

app.get('/', (req, res) => { ... });
app.listen(80, err => {
    if(err) throw err;
    console.log("%c Server running", "color: green");
});

Also I made sure I added engines to package.json:

"scripts": {
    "start": "node server.js"
},
"engines": {
    "node": "10.11.0",
    "npm": "6.4.1"
},

I've also created a Procfile file in the root path with web: npm run start inside.

So when everything is checked I just run these mands and everything looks great until I check the logs or visit the app:

git mit -am "my mit text"
git push heroku master

I see this in the logs:

remote: -----> Compressing...

remote: Done: 18.3M

remote: -----> Launching...

remote: Released v12

remote: https://my-app.herokuapp./ deployed to Heroku

remote:

remote: Verifying deploy... done.

To https://git.heroku./my-app.git

3656da0..f1eb078 master -> master

So... Any suggestions on what am I doing wrong? Thanks in advance.

• javascript
• node.js
• git
• express
• heroku

Share Improve this question Follow asked Oct 25, 2018 at 14:53 Martin FernandezMartin Fernandez 37811 gold badge55 silver badges1818 bronze badges

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3 Answers 3

Sorted by: Reset to default 19

You need to provide port for app to listen on in environment variable.
What heroku does is it runs our app on dynamic port.

Try using this:

const PORT = process.env.PORT || 3000;
app.listen(PORT, err => {
    if(err) throw err;
    console.log("%c Server running", "color: green");
});

Also you shouldn't bind the port to 80, as it is a reserved standard http port.

Heroku dynos expose a dynamic port for your app to bind to. This value is exposed in the $PORT env var. You must change your code to bind to this port instead.

const port = process.env.PORT || 3000;

app.listen(port, err => {
    if(err) throw err;
    console.log("%c Server running", "color: green");
});

For modules solution ( "type": "module" in package.json):

const process = require('process');
const port = process.env.PORT || 8080;

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