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I have the following files:

Dockerfile:

FROM node:8

# Create app directory
WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install

COPY . .

EXPOSE 8080
CMD [ "npm", "start" ]

server.js:

'use strict';

const express = require('express');

// Constants
const PORT = 8080;
const HOST = '0.0.0.0';

// App
const app = express();
app.get('/', (req, res) => 
 res.send('Hello worldn');
);

app.listen(PORT, HOST);
console.log(`Running on http://$HOST:$PORT`);

package.json:

 "name": "docker_web_app",
 "version": "1.0.0",
 "description": "Node.js on Docker",
 "author": "First Last <first.last@example.com>",
 "main": "server.js",
 "scripts": 
 "start": "node server.js"
 ,
 "dependencies": 
 "express": "^4.16.1"
 

.dockerignore:

node_modules
npm-debug.log

Then I build Docker images:

docker build -t nodeapp -f ./Dockerfile .

It works, the image is created. Then I run it:

docker run -p 49160:8080 -d nodeapp

And exec following:

docker exec -it <container id> /bin/bash

If I type curl -i localhost:49160, I get Failed to connect to localhost port 49160: Connection refused.

Nonetheless, if I type curl -i localhost:8080 that's ok:

HTTP/1.1 200 OK
X-Powered-By: Express
Content-Type: text/html; charset=utf-8
Content-Length: 12
ETag: W/"c-M6tWOb/Y57lesdjQuHeB1P/qTV0"
Date: Wed, 06 Mar 2019 23:20:41 GMT
Connection: keep-alive

Hello world

Yet, I can't get localhost:8080 (neither localhost:49160) in the Chrome on my original system, i.e., out of Docker at all.

Is it possible to run dockered apps in browsers? How to fix it to make it work?

EDIT:

1) I must have checked out an IP address with docker-machine ip

2) go to <docker-machine-ip>:49160

Short answer:

docker run -p 8080:8080 -d nodeapp

Explained :

When you try to access the port 49160 from within the instance, it is normal that it says that the connection is refused because this port is mapped from your container to your system. So only your system will be able to check this port.

I tried your files and I can access properly to the servers using http://localhost:49160

If you want to access to the port 8080 from your system, then change the mapping port while you're run the container :

docker run -p 8080:8080 -d nodeapp
# -p portAccessibleFromYourSystem:portYouWantToShare