Nodejs Express App Not Starting

Question

Hello,

I have a very simple Express app that works fine locally that I am deploying to Azure. Code is below:

const express = require('express')  
const app = express()  
const port = 3000  
  
app.get('/', (req, res) => {  
  res.send('Hello World!')  
})  
  
app.listen(port, () => {  
  console.log(`Example app listening at http://localhost:${port}`)  
})

This deploys without issue, but the container in Azure is not running. Here are the logs:

36848-2020-11-02-lw1sdlwk00000s-dockerlog.txt

I'm unsure if I am missing additional configuration - the app is running on port 3000, I am sure I need to add some reverse proxy to port 80 in Azure.

Answer

Hi @Matt Bergwall ,

I suggest setting your port to process.env.PORT if available, this will allow your application to listen to the port set for your environment. You can set it as follows:

 const port = process.env.PORT || 3000

Another thing you could do is set WEBSITES_PORT = 3000. You can do this by either adding the value to your Application Settings under the Configuration blade in the portal:

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Nodejs Express App Not Starting

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