Unable to run node.js app through Docker container

Question

I have a node.js application which I am trying to run in docker. Here is the package.json file snippet.

"main": "lib/server.js",
  "scripts": {
    "clean": "cross-env rm -rf dist",
    "build": "cross-env babel lib -d dist",
    "start": "npm run clean && npm run build && npm run serve",
    "serve": "node dist/index.js",
    "dev": "cross-env NODE_ENV=development nodemon lib/server.js --exec babel-node",
    "test": "echo \"Error: no test specified\" && exit 1",
    "lint": "eslint --ext .js lib/ scripts/ --ignore-pattern node_modules/"
  }

And here is the Dockerfile to build the image

#---- Base Node------
FROM node:10.15.1-alpine

RUN mkdir -p /usr/src/app

WORKDIR /usr/src/app

COPY package*.json ./

COPY lib ./lib

RUN npm install --only=production && npm run build

EXPOSE 4201

CMD ["npm", "run", "serve"]

I get the following error when I try to run the image. Here is the screenshot of the error.

The node and npm version are the same on my machine and the base image that I am using to build my image. When I run the same command locally in my machine it works Here is the exact command that I am running on my machine and it works.

npm install --only=production

npm run build

npm run serve

Am I doing something wrong here ? Any help is appreciated.

check your package.json dependency list, you might not have added express in it. Post full package.json file. — Mehul Prajapati
– Mehul Prajapati, Commented Feb 24, 2019 at 5:39
Are you sure Babel is available and transpiling successfully? — john-goldsmith
– john-goldsmith, Commented Feb 24, 2019 at 6:31
"babel-cli": "^6.26.0", "babel-polyfill": "^6.26.0", "express": "^4.16.4" Yes I have babel and express. How do I check if babel is transpiling successfully ? — Anshul Tripathi
– Anshul Tripathi, Commented Feb 24, 2019 at 14:50
Found it. I forgot to copy .babelrc in the Dockerfile to the workspace. It should have been this COPY .babelrc ./ . .babelrc is required for babel to transpile. — Anshul Tripathi
– Anshul Tripathi, Commented Feb 24, 2019 at 15:05

Pedro Silva · Accepted Answer · 2019-02-24 09:52:12Z

1

You are using ES6 imports

import x from package

In order to do that, you should have Babel package installed, otherwise it won't know how to import that file

answered Feb 24, 2019 at 9:52

Pedro Silva

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Anshul Tripathi Over a year ago

"babel-cli": "^6.26.0", "babel-polyfill": "^6.26.0", "express": "^4.16.4" Yes I have babel installed.

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