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JavaScript 整形・圧縮

JavaScript formatter: beautify indentation, minify size and safely handle strings and comments with custom indent for development, with one-click copy and offline.

使い方

JS コードを貼り付けて「整形」または「圧縮」を選ぶと、結果とサイズ変化が即座に表示されます。

Overview

JavaScript Formatter & Minifier is a Developer tool. JavaScript formatter: beautify indentation, minify size and safely handle strings and comments with custom indent for development, with one-click copy and offline. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of JavaScript Formatter & Minifier: Paste JavaScript, pick Beautify or Minify, and get the result with size changes instantly. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use JavaScript Formatter & Minifier offline or on poor network — all calculations stay local and private.
  • Convert between CSV/JSON/Markdown
  • Escape code for string literals

How to use

  1. 1 Paste JavaScript, pick Beautify or Minify, and get the result with size changes instantly..
  2. 2 Pick action and options
  3. 3 Fix highlighted errors
  4. 4 Copy or export

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Disable live validation for large files
  • Strict JSON disallows comments/trailing commas
  • Watch greedy vs lazy regex

FAQ

Why invalid?
Trailing commas, single quotes or BOM often cause it.
Offline?
Yes, parsing is local.
How is JavaScript Formatter & Minifier different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “javascript formatter, minify” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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