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uglify-js

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uglify-js

JavaScript parser, mangler/compressor and beautifier toolkit

  • 3.19.3
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  • npm
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17M
decreased by-10.54%
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What is uglify-js?

The uglify-js npm package is a JavaScript parser, minifier, compressor, and beautifier toolkit. It is commonly used to reduce the size of JavaScript files by removing unnecessary characters (like whitespace, comments, etc.) without changing their functionality. This helps in decreasing the load time and bandwidth usage of web applications.

What are uglify-js's main functionalities?

Minification

Minification is the process of removing unnecessary characters and whitespace from source code without changing its functionality. The code sample demonstrates how to read a JavaScript file, minify it using uglify-js, and then write the minified code to a new file.

const uglifyJS = require('uglify-js');
const fs = require('fs');

const code = fs.readFileSync('example.js', 'utf8');
const minifiedCode = uglifyJS.minify(code).code;

fs.writeFileSync('example.min.js', minifiedCode);

Compression

Compression is a form of optimization that reduces code size by performing various transformations, such as removing dead code or simplifying expressions. The code sample shows how to use uglify-js to compress a JavaScript file by removing console statements and then writing the compressed code to a new file.

const uglifyJS = require('uglify-js');
const fs = require('fs');

const options = {
  compress: {
    drop_console: true
  }
};

const code = fs.readFileSync('example.js', 'utf8');
const compressedCode = uglifyJS.minify(code, options).code;

fs.writeFileSync('example.compressed.js', compressedCode);

Mangling

Mangling is the process of shortening variable and function names to reduce file size and potentially obfuscate code. The code sample illustrates how to use uglify-js to mangle a JavaScript file and then save the mangled code to a new file.

const uglifyJS = require('uglify-js');
const fs = require('fs');

const options = {
  mangle: true
};

const code = fs.readFileSync('example.js', 'utf8');
const mangledCode = uglifyJS.minify(code, options).code;

fs.writeFileSync('example.mangled.js', mangledCode);

Beautification

Beautification is the process of reformatting minified or obfuscated code into a more readable and maintainable format. The code sample demonstrates how to use uglify-js to beautify a JavaScript file and then write the beautified code to a new file.

const uglifyJS = require('uglify-js');
const fs = require('fs');

const options = {
  output: {
    beautify: true
  }
};

const code = fs.readFileSync('example.js', 'utf8');
const beautifiedCode = uglifyJS.minify(code, options).code;

fs.writeFileSync('example.beautified.js', beautifiedCode);

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Package last updated on 29 Aug 2024

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