> For the complete documentation index, see [llms.txt](https://documentation.crossengage.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.crossengage.io/data-and-engagement-platform/data-management/data-management-with-data-feeds/users/update-or-delete-a-user-trait-via-file-upload.md).

# Update or Delete a User Trait via File Upload

If you wish to change information about a User after they have been uploaded to the CrossEngage Platform, you can upload a JSON file with the new value of the respective trait. To identify the User, please use the `id` field, so CrossEngage can identify the correct User to update.

If you rather wish to delete a trait for a user, upload a user feed data file with `xng-delete-trait` as the value of the trait that should be deleted for that user.

{% hint style="warning" %}
Note that xng-delete-trait works only for string fields.
{% endhint %}

```
[
 {
  "id": "123786543",
  "email": "james.dean@yahoo.com",
  "businessUnit":"crossengage",
  "zipCode":"xng-delete-trait"
 }
]
```

{% hint style="info" %}
When updating User traits, since no change is being made to the Structure of the data, only the value, it is not necessary to Upload a header file.
{% endhint %}

{% hint style="warning" %}
If `email` and/or `businessUnit` are empty or missing from the import file, the importer will update them as empty and overwrite whatever there might have been saved before in the user profile.
{% endhint %}