svelte/documentation/docs/07-misc/01-debugging.md

---
title: Debugging
---

- `@debug`
- `$inspect`

Svelte provides two built-in ways to debug your application.

## `$inspect`

TODO

## @debug

```svelte
<!--- copy: false --->
{@debug}
```

```svelte
<!--- copy: false --->
{@debug var1, var2, ..., varN}
```

The `{@debug ...}` tag offers an alternative to `console.log(...)`. It logs the values of specific variables whenever they change, and pauses code execution if you have devtools open.

```svelte
<script>
	let user = {
		firstname: 'Ada',
		lastname: 'Lovelace'
	};
</script>

{@debug user}

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

`{@debug ...}` accepts a comma-separated list of variable names (not arbitrary expressions).

```svelte
<!-- Compiles -->
{@debug user}
{@debug user1, user2, user3}

<!-- WON'T compile -->
{@debug user.firstname}
{@debug myArray[0]}
{@debug !isReady}
{@debug typeof user === 'object'}
```

The `{@debug}` tag without any arguments will insert a `debugger` statement that gets triggered when _any_ state changes, as opposed to the specified variables.