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-flow-if-else-engine The project includes: React + TypeScript setup Custom node types Flow execution logic Visual execution highlighting