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Debugging Node.js web applications running on Heroku using ngrok

Introduction

Heroku only allows each dyno to send and receive external network traffic on a single port, which means you can't simply run node --debug server.js and attach your debugger to your-app.herokuapp.com:5858.

To work around this, you can use ngrok and Heroku ngrok Buildpack to tunnel to the debugger's port and access it externally.