UglifyJS2
JavaScript minifier for reducing file size and improving load times.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is UglifyJS2?
UglifyJS2 is a JavaScript parser/minifier/beautifier that reduces the size of your code, making it faster to download and parse. It's crucial for optimizing web applications by minimizing JavaScript files without losing functionality.
Key differentiator
“UglifyJS2 stands out with its support for modern JavaScript features and ease of integration into build systems, making it a reliable choice for developers focused on performance optimization.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
While UglifyJS2 supports ES6 and beyond, it may still have issues with the latest ECMAScript features, leading to potential errors or suboptimal minification.
UglifyJS2 can become slow when processing very large JavaScript files or extensive codebases, which may delay build processes and development cycles.
Advanced minification options require a deep understanding of UglifyJS2's configuration settings, making it challenging to optimize without thorough documentation or experience.
The project has seen reduced activity in recent years, which can lead to outdated features and a higher risk of encountering unresolved issues with newer JavaScript standards.
Fit analysis
Who is it for?
✓ Best for
Developers looking to optimize their JavaScript code for faster loading and parsing.
Projects that require efficient, automated minification as part of the build process.
✕ Not a fit for
Scenarios where human-readable code is more important than file size reduction.
Real-time applications requiring unminified code for debugging purposes.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Next step
Get Started with UglifyJS2
Step-by-step setup guide with code examples and common gotchas.