jsmin.js

library1.1.0jsnpmunverified

jsmin.js v1.1.0 is a minimal command-line JavaScript minifier that removes non-essential whitespace, comments, and blank lines while preserving shebangs and strings. Inspired by Crockford's JSMin but implemented in just 34 lines of clever (not clean) JavaScript with no braces '{}' in the source. It is a single-file, zero-dependency CLI tool for file-by-file minification. Slower release cadence, last updated in 2020. Differentiator: extremely compact implementation, but limited to basic transformations and lacks configuration options.

devops testing

npm install jsmin.js

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · JSMIN.JS

jsmin.js

devopsjavascriptv1.1.0

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

jsmin

✓ npx jsmin.js input.js output.min.js

✗ require('jsmin.js')

jsmin.js is a CLI tool, not a library. There is no JavaScript import or require path. Use via command line or npx.

Minify a JavaScript file using the CLI, output written to .min.js sibling file.

echo 'var x = 1; // comment' > test.js && npx jsmin.js test.js && cat test.min.js

Debug

Known issues

gotchaThe minifier assumes 'use strict'; style and may break code that does not follow strict mode JavaScript.

fix

Ensure all input files use 'use strict'; directives where expected.

affects: >=1.0.0

gotchaNo configuration options: always removes comments and whitespace aggressively, which may break code relying on ASI or line-sensitive patterns.

fix

If you need fine-grained control, consider using a configurable minifier like Terser or UglifyJS.

affects: >=1.0.0

gotchaOutput always overwrites or creates a file with '.min.js' suffix; no dry-run or in-memory mode.

fix

Backup original files before minification.

affects: >=1.0.0

Errors

Common errors & fixes

npx: command not found: jsmin.js

The package is not installed or the name is mistyped.

fix

Run 'npm install -g jsmin.js' or use full path './jsmin.js'.

Error: Cannot find module 'jsmin.js'

Attempting to require() the package as a Node.js module when it is a CLI-only tool.

fix

Use the CLI via npx or global install: npx jsmin.js <file>

SyntaxError: Unexpected token: operator

Input contains JavaScript that does not strictly conform to 'use strict' mode assumptions.

fix

Add 'use strict'; at the top of your file or rewrite code to be strict-mode compatible.

Upgrade

Version history

1.1.0latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

5 hits · last 30 days

node

Resources

githubhttps://github.com/syall/jsmin ↗

packagejsmin.js ↗

homepagehttps://github.com/syall/jsmin ↗