skills/docuseal-code/references/embed/signing-form-js-preview-completed-document.md

## Preview completed document

To display a completed signed document in the embedded form, use the `data-preview` attribute with the submitter's `slug`. The form will render the document with all filled fields in read-only mode.

#### data-preview

Set to `true` to display the document in read-only preview mode without the submit button.

#### data-token

A [JWT token](signing-form-js.md) is required to authenticate the preview of completed documents.

Pass the `slug` of a completed submitter to display the signed version of the document. The slug can be obtained from the [Create a Submission](https://www.docuseal.com/docs/api#create-a-submission) API response or from the [form.completed](https://www.docuseal.com/docs/api#form-webhook) webhook payload.

#### HTML

```
<script src="https://cdn.docuseal.com/js/form.js"></script>

<docuseal-form
  data-src="https://docuseal.com/s/{{ slug }}"
  data-preview="true"
  data-token="JWT_TOKEN">
</docuseal-form>
```