What Is Node in Graph Data Structure?


Heather Bennett

Graphs are an essential data structure in computer science, used to represent relationships between different entities. One important concept within graphs is the node. In this article, we will delve into what a node is in the context of a graph data structure.

What is a Node?

A node, also known as a vertex, is a fundamental building block of a graph. It represents an entity or an object within the graph. Nodes can be connected to other nodes via edges to establish relationships or connections between them.

Nodes can store any type of data associated with them. For example, in a social network graph, each node can represent a user and store information such as their name, age, and profile picture. In a transportation network graph, nodes can represent cities and contain details like their names or geographical coordinates.

Properties of Nodes

Nodes in a graph have various properties that define their behavior and characteristics:

  • Value: Each node may hold a value or payload associated with it. This value can be of any data type depending on the application.
  • Neighbors: Neighbors are the nodes directly connected to a given node through edges.
  • Degree: The degree of a node represents the number of edges connected to it. For example, if Node A has three edges connecting it to other nodes, its degree would be three.

Create Nodes in JavaScript

In JavaScript, we can represent nodes using various approaches depending on our specific requirements. One common way is to use objects or classes to define nodes with associated properties and methods.

class Node {
  constructor(value) {
    this.value = value;
    this.neighbors = [];

  addNeighbor(node) {

// Creating nodes
const node1 = new Node(10);
const node2 = new Node(20);

// Connecting nodes

In the above example, we define a Node class with a constructor that takes a value as an argument. The class also has an addNeighbor method to establish connections between nodes.


Nodes are the building blocks of a graph data structure, representing entities and their relationships. They can hold values and establish connections with other nodes through edges. Understanding nodes is crucial for working with graphs effectively.

By now, you should have a clear understanding of what a node is within the context of a graph data structure. Remember to utilize nodes appropriately while implementing graph algorithms or solving problems related to graphs.

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