Docker container throwing internal node_module error

Question

I am trying to setup an environment of three docker containers for a website. One for the frontend, one for the backend and one for the database.

Each one of these has a Dockerfile and I am building them all via the docker-compose up statement.

Now the express-backend container always throws following error:

songquiz_backend   | internal/modules/cjs/loader.js:818
songquiz_backend   |   throw err;
songquiz_backend   |   ^
songquiz_backend   |
songquiz_backend   | Error: Cannot find module '/usr/src/app/app'
songquiz_backend   |     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15)
songquiz_backend   |     at Function.Module._load (internal/modules/cjs/loader.js:667:27)
songquiz_backend   |     at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
songquiz_backend   |     at internal/main/run_main_module.js:17:47 {
songquiz_backend   |   code: 'MODULE_NOT_FOUND',
songquiz_backend   |   requireStack: []
songquiz_backend   | }
songquiz_backend exited with code 1

This is what the Dockerfile looks like:

# Definieren des Basis Docker Images
FROM mongo-express

# Erstellen des Anwendungsverzeichnisses
WORKDIR /usr/src/app

# Kopieren der Konfigurationsdateien
# package.json und package-lock.json
COPY package*.json ./

# Installieren der Abhängigkeiten
RUN npm install

# Kopieren der Quelltextdateien
COPY . .

# Freigeben des Ports, unter dem der 
# Express-Server läuft
EXPOSE 8080

# Starten des definierten npm-Scripts
CMD [ "node", "server.js" ]
# Alternativ Starten im Debug-Modus
# CMD [ "npm", "start:debug" ]

And this is the 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 World');
});

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

I already tried deleting the node_modules folder in the project folder and reinstalling the modules via npm install.

Docker container throwing internal node_module error

0 Answers