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How to Build an AI-Powered Document Analyzer with LangChain & GPT-4o

1. Prerequisites & Environment Setup

• Install Python 3.10+, set up a virtual environment, and install required packages: langchain, openai, pypdf, chromadb, and python-dotenv.
• Obtain an OpenAI API key and store it securely in a .env file — never hardcode credentials.
• Prepare a sample document (PDF or TXT) for testing; ensure it contains at least 3–5 pages of structured content.

2. Loading & Chunking Your Document

• Use PyPDFLoader (or TextLoader) to ingest the document and split it into manageable chunks with RecursiveCharacterTextSplitter (chunk
  

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