Passing Custom Parameters to Auth0 Actions from Applications


This article explains how custom parameters can be passed from the application and then read in Actions.


The applications can send the custom parameters as a query parameter with the /authorize call while starting authenticating flows that use the universal login or can append them to the /oauth/token calls for the refresh token and resource owner flows.

The method of appending the custom parameters may change between different Auth0 SDKs. For single-page applications using the auth0-spa-js library, the parameter needs to be appended to the AuthorizationParams object. React, and Vue SDKs have the same capability using a similar object with the same name.

Once the custom parameters are appended, they can be accessed in the Action via event.request.query attribute.