Before you can sign a user in, you need to create an Okta application that represents your single-page application.
Start by signing in to the Okta Developer Console:
Select Applications, then Add Application. Pick Single-Page App (SPA) as the platform. Enter a name for your application (or leave the default value).
Add the Base URI of your application during local development, such as
http://localhost:8080. Also, add any base URIs where your application runs in production, such as
Next, enter values for the Login redirect URI. This is the callback from Define a callback route. Add values for local development (such as
http://localhost:8080/implicit/callback) and production (such as
Click Done to finish creating the Okta Application. You need to copy some values into your code later, so leave the Developer Console open.