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A practical guide to text chunking strategies in JavaScript for RAG applications. Covers four libraries: llm-chunk (simple paragraph/sentence splitting), LangChain (CharacterTextSplitter, RecursiveCharacterTextSplitter, TokenTextSplitter), LlamaIndex (SentenceSplitter, MarkdownNodeParser, SentenceWindowNodeParser), and semantic-chunking (embedding-based cosine similarity grouping). Also covers the Unstructured API for complex file types like PDFs and images. Each library is shown with installation commands and code examples, with trade-offs discussed around speed, control, and chunking quality.