FSM Checker

Validate and visualize Finite State Machine definitions with syntax checking and state diagram generation

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About This Tool

The FSM Checker is a comprehensive online tool for validating Finite State Machine definitions. It allows users to input FSM specifications in a structured format and performs multiple validation checks including syntax verification, detection of unreachable states, validation of transition completeness, and identification of duplicate states. The tool provides detailed error reporting with specific line numbers and issues, and generates a visual state diagram representation of valid FSMs. Perfect for students, developers, and engineers working with automata theory, protocol design, or state-based systems.

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How to Use

Enter your FSM definition in the text area using the specified format
Click the 'Validate FSM' button to check your definition
Review validation results including any errors or warnings
For valid FSMs, view the generated state diagram visualization
Use the 'Clear' button to reset the form and start over

Frequently Asked Questions

Find Quick Answers

What format should I use for FSM definitions?

Use a simple text format with states on one line (States: A,B,C), alphabet on another (Alphabet: 0,1), transitions as 'state>input>nextstate' (Transitions: A>0>B, A>1>C), start state (Start: A), and final states (Final: C).

What validation checks does the tool perform?

The tool checks for: 1) Proper syntax and format, 2) Valid state names and alphabet symbols, 3) Complete transitions for all state-input pairs, 4) Unreachable states, 5) Duplicate state definitions, and 6) Valid start and final state specifications.

Can I save or export the state diagram?

The tool generates an interactive SVG visualization that you can right-click to save as an image. For more advanced export options, consider using dedicated diagramming software.

Does the tool support different types of automata?

This tool specifically validates deterministic finite automata (DFA). For nondeterministic finite automata (NFA) or other automata types, the validation rules would need to be adjusted.

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