> For the complete documentation index, see [llms.txt](https://docs.authgear.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.authgear.com/integration/user-profiles/update-user-profile-on-sign-up-using-hooks.md).
# Update user profile on sign-up using Hooks
Using [Hooks](/customization/events-hooks/denohooks.md) you can put **extra information** into the user profile's [custom attributes](/integration/user-profiles/profile-custom-attributes.md) programmatically. This is useful for [Profile Enrichment](https://www.authgear.com/post/how-profile-enrichment-can-boost-your-product) where making your current customer data better by adding more details from outside sources.
Here are easy steps to achieve this:
**Step 1.** Make sure that you have an Authgear account. If you don't have one, you can [create it for free](https://accounts.portal.authgear.com/signup) on the Authgear website. Start by logging into your [Authgear dashboard](https://portal.authgear.com/).
**Step 2.** Go to **User Profile** → **Custom Attributes** page.
**Step 3.** Add 3 new attributes there, namely *city*, *name*, and *timezone*:
**Step 4**. Navigate to your Authgear Dashboard's **Advanced**->**Hooks** section.
**Step 5. Add** a new **Blocking Event**.
**Step 6.** Choose the Block Hook **Type** as the *TypeScript* and set the Event option to *User* *pre-create*. You will write a new Typescript function from scratch.
**Step 7.** Click on **Edit Script** under the **Config** option.
**Step 8.** Write a function logic for how you integrate any external API to populate custom attributes into the editor. For example.
```typescript
export default async function(e: EventUserPreCreate): Promise
{
// API Key for IP Geolocation
const apiKey = 'MY_API_KEY';
// Any random IP address
const ipAddress = '8.8.8.8'
// Fetch data from the IP Geolocation API
const response = await fetch(`https://api.ipgeolocation.io/ipgeo?apiKey=${apiKey}&ip=${ipAddress}`);
const data = await response.json();
return {
is_allowed: true,
mutations:{
user: {
custom_attributes: {
"city": data.city,
"country": data.country_name,
"timezone": data.time_zone.name
}
}
},
};
}
```
**Step 9.** Now if you navigate to **User Management** and **Add** a new user.
**Step 10.** After the user is created, you should able to see custom attributes values have been updated for the user:
#### Next steps
Once you learned how to update user profiles, now you can discover different ways of [accessing user profiles](/integration/user-profiles/access-user-profiles.md) in Authgear.
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