Edge Routing: Build Smart and Collision-Free Connections

Edge routing is an important part of building professional node-based applications with React Flow. While node layout libraries help organize nodes on the canvas, edge routing determines how connections travel between nodes.

For simple diagrams, default React Flow edges may be sufficient. However, when working with complex workflows, large diagrams, or interconnected systems, poorly routed edges can overlap nodes, cross other connections, and make diagrams difficult to understand.

By implementing automatic or custom edge-routing techniques, you can create cleaner connections and improve the overall readability of your React Flow applications.

What Is Edge Routing?

Edge routing is the process of calculating the path an edge follows between two connected nodes.

Instead of drawing a direct connection between source and target nodes, an edge-routing algorithm determines a suitable path based on node positions, obstacles, and routing preferences.

Common edge-routing approaches include:

• Straight routing: Connects nodes using a direct line.
• Bezier routing: Uses curves to create smooth connections.
• Step routing: Creates horizontal and vertical segments.
• Orthogonal routing: Routes edges using right-angle turns.
• Obstacle-avoiding routing: Calculates paths around nodes to reduce intersections.

The best approach depends on your diagram's complexity and visual requirements.

Why Is Edge Routing Important in React Flow?

Automatic node positioning does not always produce clean edge paths. As diagrams grow, connections may pass through nodes or overlap with other edges.

A dedicated edge-routing solution can help:

• Avoid unnecessary node intersections.
• Reduce visual clutter in complex diagrams.
• Create cleaner workflow connections.
• Improve diagram readability.
• Maintain organized connections when nodes move.

For applications such as workflow builders, automation editors, and architecture diagrams, good edge routing can significantly improve the user experience.

Automatic Edge Routing with Libavoid

For advanced edge routing, Libavoid is one option worth exploring.

Libavoid is a connector-routing library designed to calculate paths around obstacles. It can help create connections that avoid passing through nodes as the diagram changes.

React Flow's Edge Routing Pro Example demonstrates this approach using the JavaScript implementation of Libavoid.

This technique is particularly useful when building:

• Complex workflow editors.
• Large node-based diagrams.
• Software architecture visualizations.
• Automation and process mapping tools.

Unlike basic edge rendering, obstacle-aware routing requires additional calculations whenever relevant node positions or connections change.

Useful React Flow Edge Routing Libraries

There are fewer ready-to-use edge-routing solutions than node-layout libraries. However, several projects and resources provide useful starting points.

1. React Flow Smart Edge

React Flow Smart Edge is a community library designed to generate smarter edge paths in React Flow.

It can help create connections that navigate around nodes instead of simply drawing through them.

It is worth exploring when you need a more intelligent edge-routing experience without building an entire routing engine from scratch.

2. Orthogonal Edge Routing in JavaScript

Routing Orthogonal Diagram Connectors in JavaScript explains techniques for calculating orthogonal connector paths.

Orthogonal routing uses horizontal and vertical segments, making it useful for technical diagrams, workflow editors, and structured architecture visualizations.

Building Custom Edge Routing in React Flow

If existing libraries do not meet your requirements, you can implement a custom routing algorithm using React Flow's custom edge components.

For example, React Flow provides utilities such as getSmoothStepPath for generating step-style connections.

import {
  BaseEdge,
  getSmoothStepPath,
  type EdgeProps,
} from '@xyflow/react';

function CustomRoutedEdge({
  id,
  sourceX,
  sourceY,
  targetX,
  targetY,
}: EdgeProps) {
  const [edgePath] = getSmoothStepPath({
    sourceX,
    sourceY,
    targetX,
    targetY,
    borderRadius: 8,
    offset: 30,
  });

  return <BaseEdge id={id} path={edgePath} />;
}

This example creates a smooth step-style edge. It does not perform obstacle avoidance; for that, you need a routing algorithm that considers node boundaries and other obstacles.

Manual Edge Editing vs Automatic Routing

Not every application needs automatic edge routing. Sometimes users need direct control over how connections appear.

React Flow's Editable Edge Pro Example provides a useful starting point for building manually editable edge paths.

The two approaches serve different purposes:

You can also combine both approaches, allowing automatic routing by default while giving users the option to adjust individual connections.

Choosing the Right Edge Routing Approach

The best edge-routing solution depends on the complexity of your application.

• Simple diagrams: Use React Flow's built-in edge types.
• Structured workflows: Explore smooth-step or orthogonal paths.
• Obstacle avoidance: Consider Libavoid or other routing algorithms.
• Custom connection paths: Build custom edges with manual editing controls.

If you develop a new edge-routing technique or library, consider sharing it with the React Flow community. Better routing solutions can benefit developers building complex node-based applications.