Turn React Flow into a Logic Engine (If / Else Explained)
n this tutorial, we go beyond basic React Flow diagrams and build real executable logic using If / Else nodes.
You’ll learn how to:
Create a custom If / Else node in React Flow
Use multiple handles to branch logic
Execute a flow programmatically (not just visually)
Evaluate conditions at runtime
Visually highlight the active path while the flow runs
This is Part 1 of a series where we turn React Flow into a visual logic engine — similar to workflow builders, rule engines, and low-code tools.
🧠 What we build
A custom If node with true / false outputs
Branching edges based on conditions
A simple flow execution engine
Visual feedback while the flow runs
By the end, you’ll understand how React Flow can be used for far more than diagrams.
📂 Source code
👉 Download the full example project here:
🔗 https://github.com/jorishermans/react...
The project includes:
React + TypeScript setup
Custom node types
Flow execution logic
Visual execution highlighting
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