Railroad-diagram Generator is a library for creating SVG-based railroad diagrams, visual representations of grammar structures that are more readable than regular expressions or BNF. It's available as both a JavaScript and Python module, making it accessible for web developers and Python programmers alike who need to document or visualize context-free grammars. The library is particularly useful for developers working with APIs or data formats who want to provide clear, visual grammar documentation, similar to what JSON.org uses.