Detect errors on a page loaded using Page.goto

Question

I would typically report a failed test when any of the following errors are reported after loading a page:

• missing resources (javascript, stylesheet, ...)
• any javascript exceptions
• any console.error

I was wondering how to detect "errors" on a page that has been loaded using Page.goto in Playwright?

Answer 1

You will need to attach to some events and evaluate the incoming data:

• Missing resources: Attach to the response event and check the response.status() value.
• Javascript exceptions: Attach to the pageerror event.
• Console error: Attach to the console event and filter messages where type() is error.