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Recommended: JavaScript SDK with React Hooks

For new React apps, we recommend the JavaScript SDK with React Hooks (@dynamic-labs-sdk/react-hooks) instead of the legacy React SDK documented here. The JS SDK comes with many benefits such as a much smaller bundle size and other optimizations. Use the React quickstart (JavaScript SDK) to get started.

Summary

A handler runs after the user is authenticated and allows for a custom code to handle the user object before the Dynamic SDK finishes the authentication and closes the UI.

Usage

Handler Argument Value

UserProfile Authenticated user
Last modified on June 25, 2026