UglifyJS

Spec sheet

Purpose

UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.Read 4 Oct 2026 · github.com

Intended users

The documented command-line and programmatic interfaces support developers using UglifyJS in build workflows or applications.Read 4 Oct 2026 · github.com

API

The API provides a configurable minify() function that can process JavaScript and return minified code, warnings or errors.Read 4 Oct 2026 · github.com

Security

The repository has a Security tab, but the opened security page does not state a security policy or compliance certification.Read 4 Oct 2026 · github.com

License

UglifyJS is released under a BSD license.Read 4 Oct 2026 · github.com

AST tools

The toolkit includes its own AST utilities and can import SpiderMonkey AST input; Acorn can be used for parsing.Read 4 Oct 2026 · github.com

CLI

The command-line tool accepts multiple input files and reads from standard input when no input file is specified.Read 4 Oct 2026 · github.com

Compatibility limit

The project says it does not try to be Internet Explorer, Chrome/Node.js V8, or Safari/WebKit proof by default; corresponding compatibility options are available.Read 4 Oct 2026 · github.com

Install

The project documents installing UglifyJS from npm for command-line or programmatic use.Read 4 Oct 2026 · github.com

Integration

The README documents npm and Node.js usage and describes using Acorn as an optional parser.Read 4 Oct 2026 · github.com

Language support

UglifyJS supports JavaScript and most ECMAScript features, and the README recommends transpiling more exotic syntax with tools such as Babel first.Read 4 Oct 2026 · github.com

Optimization caveat

The README documents compiler assumptions and warns that some transformations can alter behavior in particular cases.Read 4 Oct 2026 · github.com

Source maps

UglifyJS can generate source maps and compose mappings from compiled JavaScript back to original source files.Read 4 Oct 2026 · github.com

Plans and prices

Every UglifyJS plan and price →

Where Specifiction places it

• JavaScript Build Tools#22 of 277.3
• Code Formatting Tools#29 of 347.3