IS-A-BUILDER is an open-source educational software designed to bridge the gap between raw textual data and structured datasets for Natural Language Processing (NLP). In the current AI landscape, the performance of Large Language Models (LLMs) and classical NLP classifiers depends heavily on the quality and structure of the underlying data. IS-A-BUILDER provides a streamlined, user-friendly interface for students, researchers, and linguists to transform unstructured .txt files or manual text input into interoperable formats standardized for scientific workflows. It can be accesed online: https://is-a-builder.streamlit.app/