FSM Online Editor

The FSM Online Editor is a web-based tool for modeling finite state machines without writing code. It provides a visual canvas to create states, define transitions on input symbols, and mark the initial and accepting states. Users can organize multiple machines, group related states, and maintain a clear, shareable model for discussion and review.
Conceptually, you supply the alphabet, the set of states, and the transition rules. The editor validates determinism, completeness, and reachability, and can simulate input strings to produce traces, acceptance results, or counterexamples. Export options include JSON representations for code generation and DOT-like diagram formats for documentation.
Primary beneficiaries include developers documenting parsers or protocol behavior, educators teaching automata theory, and researchers prototyping state-driven workflows. The tool emphasizes correctness, reproducibility, and collaboration by supporting versioned models, import/export, and language-agnostic outputs. Its differentiators are structured validation, scalable rendering for large models, and concise diagram exports compared with general drawing tools.