How do I fix a D3.js chart that isn't rendering?

How do I fix a D3.js chart that isn't rendering?

First, let's check if there are any errors in the console. Can you open the developer tools and look for any error messages?

I see a 'TypeError: Cannot read properties of undefined' message.

This usually means that you're trying to access a property of an object that doesn't exist. Can you share the part of your code where you're defining the data?

Sure, here it is: const data = undefined; I think I forgot to load the data.

That would explain the error! Make sure to load your data properly before trying to render the chart. You can use d3.json or d3.csv to load your data.