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Yes, you can pass the user name during signup using the

updateRegistrationFlow

endpoint. The user name should be included as part of the

traits

object inside the

updateRegistrationFlowBody

. The exact structure of the

traits

object depends on your identity schema configuration, but typically, you would include a field like

traits.username

or

traits.name

. Here’s an example of how to format the

updateRegistrationFlowBody

to include a user name (assuming your identity schema expects a

username

trait):

json {   "method": "password",   "password": "your-password",   "traits": {     "email": "<mailto:user@example.com|user@example.com>",     "username": "desired-username"   },   "csrf_token": "your-csrf-token" }

If you are using the Ory SDK in JavaScript/TypeScript, it would look like this:

ts await frontendAPI.updateRegistrationFlow({   flow: flowId,   updateRegistrationFlowBody: {     method: "password",     password: "your-password",     traits: {       email: "<mailto:user@example.com|user@example.com>",       username: "desired-username"     },     csrf_token: "your-csrf-token"   } })

Make sure that your identity schema includes the

username

field under

traits

, otherwise Ory Kratos will ignore or reject the field. The

traits

object is where all user profile information (like email, username, etc.) is stored during registration. The rest of the fields (

method

,

password

,

csrf_token

) are required for the password registration method. You can also include optional fields like

transient_payload

if needed for webhooks or other integrations [Submit registration flow](https://www.ory.sh/docs/kratos/bring-your-own-ui/custom-ui-basic-integration#submit-registration-flow) [Kratos API Reference](https://raw.githubusercontent.com/ory/kratos/master/spec/api.json). If you need to see the required fields for your specific registration flow, inspect the

flow.ui.nodes

property when initializing or fetching the registration flow, as it will list all expected form fields based on your schema [Submit registration flow](https://www.ory.sh/docs/kratos/bring-your-own-ui/custom-ui-basic-integration#submit-registration-flow). Summary: - Pass the user name as a field inside the

traits

object in

updateRegistrationFlowBody

. - The format is determined by your identity schema (e.g.,

traits.username

). - Example payloads are shown above.