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Simple Tree Utils

Simple Tree Utils is the library to convert and manipulate with tree-like structures. Library provides converter from an array of objects to trees like structure and vice versa, and also methods to manipulate that tree and/or search in that tree.

It is created because I needed to convert the array of objects into a tree to visualize in Angular tree component. Surely there are plenty of similar libraries, but I think all of them work with their own models/classes, I needed to use my own data without no extra instantiating, or adding extra methods/properties into the working model.


Install library using npm npm install simple-tree-utils --save and import main class into your code base import {TreeUtils} from 'simple-tree-utils'; .


First instantiate class with config, or without config.

const treeUtils = new TreeUtils(); // without config, default values are used (id as idProp, parentId as parentIdProp, children as childrenProp)
const treeUtils2 = new TreeUtils({
idProp: 'id', // the key of a unique identifier for an object (source object)
parentIdProp: 'parentId', // the key of a unique parent identifier (source object)
childrenProp: 'children', // the key, where child nodes are stored (destination object tree)

After instantiation, you can use tree utils. You can convert the array of the following objects into a tree using list2Tree method as following

const items = [
{id: 1, parentId: null, name: 'Node 1'},
{id: 2, parentId: null, name: 'Node 2'},
{id: 3, parentId: 1, name: 'Node 3'},
{id: 4, parentId: 1, name: 'Node 4'},
{id: 5, parentId: 2, name: 'Node 5'},
{id: 6, parentId: 3, name: 'Node 6'},
const output = treeUtils.list2Tree(items);

then the output of lift2Tree will be

const tree = [
id: 1, parentId: null, name: 'Node 1', children: [
id: 3, parentId: 1, name: 'Node 3', children: [
{id: 6, parentId: 3, name: 'Node 6', children: []},
{id: 4, parentId: 1, name: 'Node 4', children: []},
id: 2, parentId: null, name: 'Node 2', children: [
{id: 5, parentId: 2, name: 'Node 5', children: []},

When you got a structure like the above, you can use all the following methods:

Name Desription Signature
addNode Method to add new node to tree (mutable operation!) addNode(tree: any[], parentId: any, childData: any): void
deleteNode Method to delete node in tree by given id (mutable operation!) deleteNode(tree: any[], id: any): any
editNode Method to update node by id with given data in tree (mutable operation!) editNode(tree: any[], id: any, data: any): void
findAllChildrenNodes Method to find all children nodes of given node in tree structure findAllChildrenNodes(tree: any[], id: any): any[]
findAllParentNodes Method to find all parents of given node in tree structure findAllParentNodes(tree: any[], id: any): any[]
findAllTreeNodes Method to find all nodes in tree structure by given callback function findAllTreeNodes(tree: any[], fn: ((item: any) => boolean)): any
findNodeParent Method to find parent of given node in tree structure findNodeParent(tree: any[], id: any, parent?: any): any
findTreeNode Method to find node in tree structure by given callback function findTreeNode(tree: any[], fn: ((item: any) => boolean)): any
findTreeNodeById Method to find node in tree structure by given id findTreeNodeById(tree: any[], id: any): any

For example, we can find node by giving callback

const node = treeUtils.findTreeNode(tree, item => item.id === 2);

If you need a list again, you can convert the tree back to a list using treeUtils.tree2List method



For more details and complete documentation check: https://simple-tree-utils.netlify.app/

Usage in browser

You can also use this library in the browser without compiling using jsDelivr. Import script into HTML file, and you can access classes through the global treeUtils object.

<script src="https://cdn.jsdelivr.net/npm/simple-tree-utils@1/dist/browser-bundle.min.js"></script>
const utils = new treeUtils.TreeUtils();
const tree = utils.list2Tree(items);



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