Credentials and Additional Data

Updated on Nov 10, 2026

During file upload or removal, you can configure whether to send credentials with cross-origin requests, add custom headers, or send additional data.

Attaching Credentials to Requests

To send credentials with cross-origin upload and remove requests, set the withCredentials option to true. By default, cross-origin requests are sent without credentials. Same-origin requests include browser-managed credentials, such as cookies, by default; withCredentials does not affect them.

Example

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Attaching Additional Data to Requests

You can also send additional data in the form of key/value pairs and modify the request headers.

Depending on when the data will be sent:

• In the onBeforeUpload event handler, update the additionalData or headers property of the event
• In the onBeforeRemove event handler, update the additionalData or headers property of the event

Example

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Suggested Links

• API Reference of the Upload