How do I debug my Docker container running an Express app?

How do I debug my Docker container running an Express app?

You can start by checking the logs of your Docker container using docker logs <container_id>. This will show you any errors or output from your Express app.

What if the logs don't show any errors?

If there are no errors in the logs, try accessing the container's shell using docker exec -it <container_id> /bin/bash to inspect the application files and environment.

How can I check if the Express server is running inside the container?

You can use curl to send a request to the server from within the container. For example, curl http://localhost:3000 if your Express app runs on port 3000.

What if I need to change the code and rebuild the container?

You can modify your code, then rebuild the Docker image using docker-compose build or docker build ., and restart the container with docker-compose up.