How to get docker mapped ports from node.js application?

Question

I would like to get mapped port from inside node.js application.

ex.

docker-compose:

my-app:
    build:
        context: ./my-app
           


        

Answer 1

I used a dockerode library for this.

Solution:

const Docker = require( 'dockerode' );
const os = require( 'os' );

const docker = new Docker( { socketPath: '/tmp/docker.sock' } );
const container = docker.getContainer( os.hostname() );

container.inspect( function( error, data ) {
    if ( error ) {
        return null;
    }

    const mappedPort = data.NetworkSettings.Ports[ '80/tcp' ][ 0 ].HostPort
} );