JS minifier
JS minifier compacts JavaScript source for review. Compare the output with your original script and test its behavior before replacing code in an application.
JS minifier helps you prepare a compact JavaScript result for review while retaining the editable source used during development. Start with a representative sample of your actual task. Read the form labels and the returned value before replacing text, a link, or a code fragment that is already in use.
How to use JS minifier
- Paste a JavaScript sample.
- Select Submit.
- Compare the result and run appropriate checks in a safe development environment.
Worked example
Start with const total = 1 + 2; and confirm the result still evaluates to 3 in your test environment. Expand to larger modules only after checking syntax compatibility.
Limits and checks
Minification is not transpilation, bundling, malware analysis, or encryption. Automatic semicolon insertion and newer syntax can affect compatibility. Keep tests and the original code; compact output alone does not demonstrate correct behavior.
Frequently asked questions
Does the appearance prove the result is correct?
No. Compact or readable output does not check every rule of its destination. Compare syntax, values, and behavior in an appropriate environment before using the result in production.
Does minification make new JavaScript syntax work in older browsers?
No. Compacting code is not a promise of transpilation or compatibility. Check the language features you use and test the result in the browsers your project actually supports.
Related tools
Review compact HTML markup with HTML minifier.
Review stylesheet compaction separately with CSS minifier.
Inspect the layout of a JSON sample with JSON validator & beautifier.
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HTML minifier prepares compact markup from an HTML sample. Compare character counts, inspect whitespace changes, and test the result before using it on a page.
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