> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rownd.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Validating third-party authenticators

Rownd's token validator allows you to authenticate a token issued by another authentication provider and exchange it for a Rownd token. This feature is useful when migrating to Rownd from another authentication provider and you want to prevent existing users from being signed-out during the transition. It can also be used when moving between contexts, such as when your code is embedded in an implementation that you don't directly control (e.g., a webview inside someone else's mobile app).

Use Rownd's [token validator integration](/configuration/integrations/token-validator) to configure this feature.