natural‑brain is a Node.js library that implements a natural‑language text classifier by wrapping a Brain.js neural network for use with the Natural language processing toolkit. It lets developers add labeled documents, train a lightweight neural model, and then classify new strings, with support for saving and loading the trained model. The package is aimed at JavaScript developers who need a simple, trainable classifier for tasks such as tagging emails, support tickets, or any short‑text categorization.