react-diagrams/diagrams-demo-gallery/demos/demo-serializing/index.tsx

import createEngine, { DiagramModel, DefaultNodeModel, DefaultLabelModel } from '@projectstorm/react-diagrams';
import * as React from 'react';
import { DemoButton, DemoWorkspaceWidget } from '../helpers/DemoWorkspaceWidget';
import { action } from '@storybook/addon-actions';
import * as beautify from 'json-beautify';
import { CanvasWidget } from '@projectstorm/react-canvas-core';
import { DemoCanvasWidget } from '../helpers/DemoCanvasWidget';

export default () => {
	//1) setup the diagram engine
	var engine = createEngine();

	//2) setup the diagram model
	var model = new DiagramModel();

	//3-A) create a default node
	var node1 = new DefaultNodeModel('Node 1', 'rgb(0,192,255)');
	var port1 = node1.addOutPort('Out');
	node1.setPosition(100, 100);

	//3-B) create another default node
	var node2 = new DefaultNodeModel('Node 2', 'rgb(192,255,0)');
	var port2 = node2.addInPort('In');
	node2.setPosition(400, 100);

	//3-C) link the 2 nodes together
	var link1 = port1.link(port2);
	link1.addLabel(new DefaultLabelModel({ label: 'Label' }));

	//4) add the models to the root graph
	model.addAll(node1, node2, link1);

	//5) load model into engine
	engine.setModel(model);

	//!------------- SERIALIZING ------------------

	var str = JSON.stringify(model.serialize());

	//!------------- DESERIALIZING ----------------

	var model2 = new DiagramModel();
	model2.deserializeModel(JSON.parse(str), engine);
	engine.setModel(model2);

	return (
		<DemoWorkspaceWidget
			buttons={
				<DemoButton
					onClick={() => {
						action('Serialized Graph')(beautify(model2.serialize(), null, 2, 80));
					}}
				>
					Serialize Graph
				</DemoButton>
			}
		>
			<DemoCanvasWidget>
				<CanvasWidget engine={engine} />
			</DemoCanvasWidget>
		</DemoWorkspaceWidget>
	);
};