svelte/site/content/tutorial/18-debugging/01-debug/text.md

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The @debug tag

Occasionally it's useful to inspect a piece of data as it flows through your app.

One approach is to use console.log(...) inside your markup. If you want to pause execution, though, you can use the {@debug ...} tag with a comma-separated list of values you want to inspect:

{@debug user}

<h1>Hello {user.firstname}!</h1>

If you now open your devtools and start interacting with the <input> elements, you'll trigger the debugger as the value of user changes.