How to get the login_challenge value?

[cosmin-z]

Hi,

I am using this template (https://github.com/ory/hydra-login-consent-node/blob/master/src/routes/login.ts) for the realization of my application. The only difference is I created the admin from scratch:

`
import { Configuration, OAuth2Api } from "@ory/hydra-client"

const hydraAdmin = new OAuth2Api(
new Configuration({
basePath: process.env.HYDRA_PUBLIC_URL,
}),
)
`

The problem I am encountering concerns the fact the login_challenge value is always undefined and I do not understand from the documentation how this value is obtained.

Thanks for the help!

[Benehiko]

Hi @cosmin-z

Ory Hydra has to initialize the request and redirect the user to the login endpoint where the URL will contain the login_challenge as a query parameter.

I would suggest taking a look at https://www.ory.sh/docs/hydra/guides/custom-ui-oauth2

[cosmin-z]

Hi thanks for the answer. I read the documentation, it is in their test it seems that everything happens automatically and I don't understand how to adapt my code to attach values as query parameter

[Benehiko]

Hi @cosmin-z

The login_challenge isn't set by you, it is set by Ory Hydra. How this works, is you initialize an oauth flow to Hydra which redirects to Ory Kratos (with the login_challenge). Kratos then redirects to the Login UI (your app / Account Experience) with login_challenge in the URL as well as in the flow data.

Ory OAuth2 and OpenID Connect appends a login_challenge query parameter to the URL. The value is an ID which should later be used by the login endpoint to fetch important information about the request.

https://www.ory.sh/docs/oauth2-oidc/custom-login-consent/flow#login