Where is jquery used

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Last updated: April 8, 2026

Quick Answer: jQuery is a JavaScript library primarily used for simplifying HTML document traversal, event handling, and animation in web development. It was created by John Resig in 2006 and became the most popular JavaScript library by 2015, used on over 70% of the top 10 million websites. While its usage has declined with modern frameworks, it remains important for legacy systems and specific use cases.

Key Facts

Created by John Resig in 2006
Used on over 70% of top 10 million websites at peak (2015)
Downloaded over 100 million times from npm in 2020
Reduced average DOM manipulation code by 60-80% compared to vanilla JavaScript
Supported all major browsers back to Internet Explorer 6

Overview

jQuery is a fast, small, and feature-rich JavaScript library that revolutionized web development in the late 2000s and early 2010s. Created by John Resig and first released in August 2006, it addressed the challenges of cross-browser compatibility and complex DOM manipulation that plagued early web developers. The library gained rapid adoption due to its simple syntax and powerful capabilities, becoming the de facto standard for client-side scripting for nearly a decade.

At its peak around 2015, jQuery was used on approximately 70% of the top 10 million websites worldwide, making it the most dominant JavaScript library in history. While modern frameworks like React, Vue, and Angular have reduced its prevalence in new projects, jQuery continues to power millions of existing websites, particularly content management systems like WordPress, Drupal, and Joomla. Its legacy remains significant in maintaining backward compatibility and supporting older browser versions.

How It Works

jQuery simplifies complex JavaScript operations through a concise API that abstracts browser inconsistencies.

DOM Manipulation: jQuery provides methods like $() selectors that reduce DOM query code by 60-80% compared to vanilla JavaScript. For example, selecting elements by class requires just $('.className') versus document.querySelectorAll('.className') in pure JavaScript.
Event Handling: The library normalizes event handling across different browsers, including legacy support for Internet Explorer 6-8. jQuery's event system handles approximately 50 different event types with consistent behavior, eliminating the need for browser-specific code.
AJAX Operations: jQuery's $.ajax() method simplified asynchronous requests, reducing typical AJAX code from 15-20 lines to just 3-5 lines. This made dynamic content loading accessible to developers without deep JavaScript expertise.
Animation Effects: Built-in animation methods like .fadeIn(), .slideUp(), and .animate() provided cross-browser compatible animations without requiring CSS3 or complex JavaScript timing functions.

Key Comparisons

Feature	jQuery	Modern Frameworks (React/Vue)
Browser Compatibility	Supports IE6+ and all modern browsers	Typically IE11+ or modern browsers only
Learning Curve	1-2 weeks for basic proficiency	1-3 months for framework mastery
Bundle Size	~30KB minified (version 3.6.0)	React: ~6KB + dependencies, Vue: ~33KB
Performance	Good for simple DOM updates	Optimized for complex applications with virtual DOM
Mobile Support	Full mobile browser compatibility	Excellent with responsive design patterns

Why It Matters

Web Democratization: jQuery made advanced web development accessible to millions of developers, contributing to the explosive growth of interactive websites from 2006-2015. During this period, the percentage of websites using JavaScript libraries increased from 25% to over 80%.
Cross-Browser Standardization: By abstracting browser differences, jQuery saved developers thousands of hours in compatibility testing and code adjustments. This was particularly crucial during the IE6-IE9 transition period when browser fragmentation was severe.
Legacy System Maintenance: With over 40% of existing websites still using jQuery as of 2023, understanding the library remains essential for maintaining and updating older web applications, especially in enterprise and government sectors.

Looking forward, jQuery's role continues to evolve from a primary development tool to a maintenance and migration concern. While new projects increasingly adopt modern frameworks, jQuery's influence persists through its impact on web standards and the millions of websites that still depend on it. The library's success demonstrated the power of abstraction in web development, paving the way for today's component-based architectures. As web technologies advance, jQuery serves as an important historical milestone and a practical tool for specific use cases where simplicity and backward compatibility outweigh the benefits of modern frameworks.