It doesn't happen often but sometimes your web server will start acting up and you need to solve it using the command line. Here are some common errors I see while using Node or NPM.

Common Error #1

The error looks like this. Error: bind EADDRINUSE null:

Method 1

If you see this, here's how to find the problem.

sudo lsof -i -P | grep 5000

Method 2

ps aux | grep node

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