---
id: auth-onauthstatechange
title: "auth.onAuthStateChange()"
slug: auth-onauthstatechange
---
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
Receive a notification every time an auth event happens.
```js
supabase.auth.onAuthStateChange((event, session) => {
console.log(event, session)
})
```
```py
# Not yet implemented
```
## Parameters
-
callback
required
object
No description provided.
## Examples
### Listen to auth changes
```js
supabase.auth.onAuthStateChange((event, session) => {
console.log(event, session)
})
```
```py
# Not yet implemented
```