useNodesState

Source on GitHub

This hook makes it easy to prototype a controlled flow where you manage the state of nodes and edges outside the ReactFlowInstance. You can think of it like React’s useState hook with an additional helper callback.

import { ReactFlow, useNodesState, useEdgesState } from '@xyflow/react';
 
const initialNodes = [];
const initialEdges = [];
 
export default function () {
  const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
 
  return (
    <ReactFlow
      nodes={nodes}
      edges={edges}
      onNodesChange={onNodesChange}
      onEdgesChange={onEdgesChange}
    />
  );
}

Signature

Name	Type
#Params
#`initialNodes`	`Node<T>[]`
#Returns
#`[0]`	`Node<T>[]` The current array of nodes. You might pass this directly to the nodes prop of your <ReactFlow /> component or you may want to manipulate it first to perform some layouting, for example.
#`[1]`	`React.Dispatch<React.SetStateAction<Node<T>[]>>` A function that you can use to update the nodes. You can pass it a new array of nodes or a callback that receives the current array of nodes and returns a new array of nodes. This is the same as the second element of the tuple returned by React's useState hook.
#`[2]`	`(changes: NodeChange[]) => void` A handy callback that can take an array of NodeChanges and update the nodes state accordingly. You'll typically pass this directly to the onNodesChange prop of your <ReactFlow /> component.

Typescript

This hook accepts a generic type argument of custom node types. See this section in our Typescript guide for more information.

const nodes = useNodesState<CustomNodeType>();

Notes

This hook was created to make prototyping easier and our documentation examples clearer. Although it is OK to use this hook in production, in practice you may want to use a more sophisticated state management solution like Zustand instead.

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