Creating a Linked List in JavaScript using Mockedin-Client Data

Sep 4, 2023·

3 min read


In this tutorial, we will learn how to create a simple linked list in JavaScript. Specifically, we will populate this linked list with data from a project called "Mockedin-Client." This client-side project simulates key LinkedIn features and is available on GitHub.

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What is a Linked List?

A linked list is a data structure used for storing a sequence of elements. Each element contains a reference (or link) to the next element in the sequence.

Setting up the Node and LinkedList Classes

First, let's set up our Node and LinkedList classes in JavaScript:

// Node Class: Represents each element in the linked list
class Node {
  constructor(user) {
    this.user = user;  // Store user data = null;  // Initialize next to null

// LinkedList Class: Manages the linked list
class LinkedList {
  constructor() {
    this.head = null;  // Initialize head to null

  // Method to append a user to the list
  append(user) {
    const newNode = new Node(user);  // Create new node with user data

    if (!this.head) {
      this.head = newNode;  // If list is empty, set head to new node

    // Traverse to the last node in the list
    let current = this.head;
    while ( {
      current =;

    // Attach new node to the last node's next pointer = newNode;

Populating the Linked List with Mockedin-Client Data

Assuming you have your data stored in a db.json file, here is a sample:

  "linkedinUsers": [
    { "id": 1, "name": "John Doe", "position": "Developer" },
    { "id": 2, "name": "Jane Smith", "position": "Recruiter" },
    { "id": 3, "name": "Emily Johnson", "position": "CEO" },
    { "id": 4, "name": "Mike Brown", "position": "Sales" }

We can populate our linked list with this data as follows:

// Sample data from Mockedin-Client
const db = {
  "linkedinUsers": [
    { "id": 1, "name": "John Doe", "position": "Developer" },
    { "id": 2, "name": "Jane Smith", "position": "Recruiter" },
    { "id": 3, "name": "Emily Johnson", "position": "CEO" },
    { "id": 4, "name": "Mike Brown", "position": "Sales" }

// Create a new linked list instance
const userList = new LinkedList();

// Populate linked list with Mockedin-Client data
db.linkedinUsers.forEach((user) => {

// Now, userList is a linked list containing Mockedin-Client users.


And there you have it! We've created a simple linked list in JavaScript and populated it with data from the Mockedin-Client project. This is a basic example, but you can extend it to suit your specific needs.

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