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JavaScript localStorage and sessionStorage

Master Web Storage API and become an in-demand frontend developer today!

4.3
Beginner

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JavaScript localStorage and sessionStorage
5 Modules
May 2026
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Course Curriculum

5 Modules · 5 Chapters · 10 Topics · 86 Sub-topics

01
Foundation
1 Chapters · 1 Topics · 14 Sub-topics
Introduction to the DOM
1 Topics
DOM Fundamentals
14 Sub-topics
What is the Document Object Model
DOM as a Programming Interface
How Browsers Build the DOM
DOM vs HTML Source Code
DOM Tree Visualization
Understanding Nodes
Node Types Overview
Element Nodes vs Text Nodes
Comment Nodes and Document Nodes
DOM and JavaScript Relationship
Browser Developer Tools for DOM
Inspecting DOM in DevTools
Live DOM Editing
DOM Specifications and Standards
02
localStorage Deep Dive
1 Chapters · 2 Topics · 18 Sub-topics
Browser Storage - localStorage
2 Topics
localStorage Fundamentals
11 Sub-topics
Web Storage Introduction
localStorage Overview
Storage Availability Check
setItem Method
getItem Method
removeItem Method
clear Method
key Method
length Property
Iterating Over localStorage
Storage Limits
Advanced localStorage
7 Sub-topics
Storing Complex Data
JSON Stringify and Parse
Storage Event
Cross-Tab Communication
localStorage Security
Private Browsing Behavior
localStorage Best Practices
03
sessionStorage Deep Dive
1 Chapters · 2 Topics · 16 Sub-topics
Browser Storage - sessionStorage
2 Topics
sessionStorage Fundamentals
9 Sub-topics
sessionStorage Overview
sessionStorage vs localStorage
Session Scope Explained
setItem Method
getItem Method
removeItem Method
clear Method
Session Lifecycle
Tab Duplication Behavior
sessionStorage Usage
7 Sub-topics
When to Use sessionStorage
Form Data Persistence
Wizard/Multi-Step Forms
Temporary State Storage
sessionStorage Limits
Security Considerations
sessionStorage Best Practices
04
Cross-Tab Communication
1 Chapters · 2 Topics · 18 Sub-topics
Browser Storage - localStorage
2 Topics
localStorage Fundamentals
11 Sub-topics
Web Storage Introduction
localStorage Overview
Storage Availability Check
setItem Method
getItem Method
removeItem Method
clear Method
key Method
length Property
Iterating Over localStorage
Storage Limits
Advanced localStorage
7 Sub-topics
Storing Complex Data
JSON Stringify and Parse
Storage Event
Cross-Tab Communication
localStorage Security
Private Browsing Behavior
localStorage Best Practices
05
Best Practices
1 Chapters · 3 Topics · 20 Sub-topics
Security in DOM Applications
3 Topics
XSS Prevention
9 Sub-topics
DOM Security Overview
Cross-Site Scripting (XSS)
Types of XSS Attacks
DOM-Based XSS
Preventing XSS
Safe Content Insertion
textContent vs innerHTML
Sanitizing User Input
DOMPurify Library Concept
Content Security
5 Sub-topics
Content Security Policy
CSP Headers
CSP and Inline Scripts
Trusted Types API
eval Security Risks
Frame Security
6 Sub-topics
iframe Security
sandbox Attribute
postMessage Security
Origin Validation
Third-Party Script Safety
Security Best Practices

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