Add Clerk authentication to a React app with the Clerk CLI

The text provides a comprehensive guide on integrating Clerk authentication into a React application using the Clerk CLI, detailing the process from installation to configuration of authentication features. It begins with setting up a Vite + React 19 app with Clerk's React SDK and emphasizes the simplicity of using the CLI to streamline steps that previously required manual intervention. The guide covers running commands like `clerk init`, `clerk env pull`, and `clerk doctor` to set up environment variables and verify configurations, while also highlighting the benefits of using the CLI for version-controllable JSON configurations for passkeys and session management. It addresses the limitations of a client-rendered React SPA, suggesting alternatives like Next.js for server-side needs, and explains how to verify Clerk tokens on a backend, handle OAuth redirects, and manage configurations as code. Additionally, the text discusses the use of the `clerk api` for interacting with both backend and platform APIs and provides tips for ensuring secure and efficient deployment in production environments.

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