I want to send the

login_hint

when I submit an oidc login flow. But it is a regular form submit, so how should I encode the

upstream_parameters

object? Should I use

JSON.stringify

or

URLSearchParams

? Or something else?

Hi @flat-flower-81031 You need to use the json body or multipart/form-data https://www.ory.sh/docs/kratos/bring-your-own-ui/custom-ui-advanced-integration#upstream-provider-parameters

<input type="hidden" name="upstream_parameters.login_hint" value="<mailto:foo@bar.com|foo@bar.com>" />

Thanks Alano. I haven’t read through that page yet.