Print error messages to terminal

Someone introduced a bug in a multi-page dash app. The bug renders a page unviewable. The process is:

1. on page 1, click a link to page 2
2. page 2 errors out
3. dash redirects to page 1

Step 2 → 3 happens so fast that I can’t see the error message in the in-browser debugger before the app redirects to the viewable page. How do I print the in-browser error messages to the terminal?

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