How to run nodejs express snap application

[jawad]

I have nodejs snap application, in which express server is used, 
here is express app.js code

#!/usr/bin/env node

const express = require('express');

const app = express();

const port = 3000;

// Define a route for the root URL

app.get('/', (req, res) => {

  res.send('Welcome to our Node.js Express app !');

});

// Define a route to get a list of items

app.get('/items', (req, res) => {

  const items = ['Item 1', 'Item 2', 'Item 3'];

  res.json(items);

});

// Start the server

app.listen(port, () => {

  console.log(`Server is running on http://localhost:${port}`);

});\

now i install snap application on vm ctrlx works in service mode, how i can run the project and how i can 

http://localhost:3000 

[MauroRiboniMX]

Hello,

If your snap has this app set as a daemon the process is started at boot.
Regarding Express JS: you have to start from an example and modify it in order to achieve your result.

Mauro

[jawad]

here is my snapcraft.yaml 

what changes should i do it? 
and i have installed it on ctrlx works 

[Sgilk]

It looks like the app is installed correctly. Can you not access your routes?

Ex. http://localhost:3000/items

If after reboot and switching the control into operating mode you still cannot access, there may be a problem with the app.

You can view the status & logs over SSH in the virtual CORE. Under device settings in ctrlX Works, select this option.

Then, log into the QEMU emulator using the credentials below.

     Username: rexroot

     Password: rexroot

Run the commands below to find your app name and view the snap logs.

     sudo snap list

     sudo snap logs app_name

Additional information can be found by

    sudo systemctl status

    sudo journalctl

[MauroRiboniMX]

Hello,

The address should be http://192.168.1.1:3000.. not localhost. Used in port forwarding would be http://localhost:3000.. but you have to forward the right port.

Mauro

[jawad]

currenty i am doing what you mentioned above. but it doesnot works, anything else should i do?

[jawad]

i check log book , but i donot what are these issues and how i can solve it.

[Sgilk]

The node-project.app is failing to start. At this point, I'd definitely suggest trying to debug the app using the logging tools I provided in my last comment. The log book does not necessarily provide all relevant information.

[jawad]

This code works fine with express server installed and imported, but api are commented. 

#!/usr/bin/env node

// !!! DO NOT REMOVE THE SHEBANG ON TOP OF THE FILE, WHICH SPECIFIES THIS APP TO BE EXECUTED BY NODE.JS !!!

    const express = require('express');

    const app = express();

    const port = 3000;

    // app.get('/', (req, res) => {

    // res.send('Hello, Express! Exd jawad');

    // });

    // app.listen(port, () => {

    // console.log(`Server is listening on port exdddd ${port}`);

    // });

    // // Define a route to get a list of items

    // app.get('/items', (req, res) => {

    //     const items = ['Item 1', 'Item 2', 'Item 3'];

    //     res.json(items);

    // });

    function helloWorld() {

        console.log("EXD expresss 11")

        console.log('app ====', app)

        console.log('port ====', port)

        console.log("EXD expresss 22")

    };

    helloWorld();

but when i un-comment the api lines error occurs in log book which i mentioned above in earlier reply.
So, I think if there is problem in code or application e.g (problem in express server) then basic code with comment should not works. because i have should express related things in console.log
but it shows me express related function in logbook. 

[Sgilk]

I agree there is a problem and that is why I suggest debugging over SSH as described above. My guess is a problem importing the express library, but it is difficult to know without better error messages. The logbook logs do not contain all possible information.