Learn how to build a PDF summarizer using AI, React JS, and Next.js in this comprehensive tutorial. Start by creating a command-line interface (CLI) with Node.js, setting up the Octo AI API key, and preparing the API for PDF parsing and summarization. Then, transition to developing a user interface with Next.js, including setting up API routes for AI summarization and configuring the OctoAI API package. Follow along to create both CLI and UI versions of a powerful PDF summarizer capable of handling multi-page documents using large language models.