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Debugging a ES6 Node.js application in a Docker container using Visual Studio Code | Alexander Zeitler

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Debugging a ES6 Node.js using in a Docker container using Visual StudioLawmaking| Alexander Zeitler Toggle navigation Home Feed Debugging a ES6 Node.js using in a Docker container using Visual StudioLawmakingWritten on April 08, 2016 Yesterday I just tried to debug an ES6 Node.js using using Visual StudioLawmakingand noticed that I couldn't remote debug. So I just asked on Twitter and got some replies from Erich Gamma and Andre Weinand today: @alexzeitler_ @code pls see the remote debugging section here https://t.co/XoMlvRis5Z // @weinand— ErichGamma (@ErichGamma) April 8, 2016 @alexzeitler_ @ErichGamma @code Sorry, but some changes from the release notes have not yet found their way into the doc.— Andre Weinand (@weinand) April 8, 2016 @erichgamma @alexzeitler_ @code and here the section well-nigh node.js remote debugging: https://t.co/TbzNwjKX7y— Andre Weinand (@weinand) April 8, 2016 As things didn't make it into official docs until now, I'll wrap it up here in a woodcut post. To alimony things simple, this is our Node.js application: const express = require('express'); const app = express(); app.get('/', (req, res) => { res.status(200).send('hello world'); }) app.listen(3000); Add a jsconfig.json into the root of the project: { "compilerOptions": { "target": "ES6", "module": "commonjs" } } Create a Dockerfile: FROM node:4.2.3 EXPOSE 3000 EXPOSE 5858 COPY . /app WORKDIR /app RUN cd /app; npm install CMD ["node", "--debug=5858","index.js"] Create a launch.json (or create it by clicking the Debug sawed-off in VS Code): { "version": "0.2.0", "configurations": [ { "name": "Launch", "type": "node", "request": "launch", "program": "${workspaceRoot}/index.js", "stopOnEntry": false, "args": [], "cwd": "${workspaceRoot}", "preLaunchTask": null, "runtimeExecutable": null, "runtimeArgs": [ "--nolazy" ], "env": { "NODE_ENV": "development" }, "externalConsole": false, "sourceMaps": false, "outDir": null }, { "name": "Attach", "type": "node", "request": "attach", "port": 5858, "address": "localhost", "restart": false, "sourceMaps": false, "outDir": null, "localRoot": "${workspaceRoot}/", "remoteRoot": "/app/" } ] } The important part in the launch.json is the Attach configuration, expressly the localRoot and remoteRoot properties: As our using on the host is in /index.js, ${workspaceRoot}/ is the correct setting. As you can see in the Dockerfile, inside the container our app runs in the /app working directory. So I've set the remoteRoot to /app/ Next, we can build our Docker image: $ docker build -t hellovscode . With that finished, we can run a container based on the image with port mappings for 3000 and 5858 activated: $ docker run -d -p 3000:3000 -p 5858:5858 hellovscode Next start the Attach Debug configuration in VS Code: As you can see, I have once set a breakpoint. Now, issue a request to http://localhost:3000/ - and we're remote debugging Node.js / ES6 in Docker Container using Visual Studio Code! If you're using Docker-Machine, make sure you're using the IP write of the Docker Machine your container are running in. You can get the IP write of the Docker Machine using: $ docker-machine ip <machinename> Use this IP write in the "address" property of your VSLawmakingAttach configuration in the launch.json. The source lawmaking including the Visual StudioLawmakingWorkspace Settings can be found here Please enable JavaScript to view the comments powered by Disqus. Copyright © Alexander Zeitler 2003 - 2016 | Impressum