JS代码格式化

它属于「开发辅助」分类：前端与后端开发中经常用到的小工具。

• 对 JavaScript 做轻量缩进，按括号层级换行，便于阅读压缩代码。
• 为启发式处理，遇到模板字符串/正则等复杂写法可能不完美；严谨格式化建议用专业预处理器。
• 处理在本地完成，不上传。

完全免费、无需注册；所有处理都在浏览器本地完成，文件不会上传到任何服务器。

相关关键词：JS代码格式化、开发辅助、js、格式化、在线工具、免费

1. 打开工具：打开「JS代码格式化」页面，无需注册、无需安装任何软件。
2. 准备输入：准备好要处理的内容或文件：文本可直接粘贴，文件可拖入页面（本工具属于「开发辅助」）。
3. 填入内容：把内容粘贴进输入框，或把文件拖入页面；也可以点击「示例」先填入样例数据试一下。
4. 设置选项并处理：按需调整页面上的选项，然后点击处理 / 转换 / 生成按钮。
5. 获取结果：处理完全在浏览器本地完成，结果可直接复制或下载，文件不会上传到任何服务器。

Indent-beautify and minify JavaScript.

Belongs to “Dev Tools”: Small utilities frequently used in front-end and back-end development.

• Light indentation for JavaScript, breaking lines by bracket depth to read minified code.
• Heuristic only; template literals/regex may not be perfect — use a real preprocessor for strict formatting.
• Processing is done locally; nothing is uploaded.

Free, no sign-up; everything runs locally in your browser and files are never uploaded.

Keywords: JS Formatter, Dev Tools, js, format, online tool, free

How to use it

1. Open the tool：Open the “JS Formatter” page — no sign-up and nothing to install.
2. Prepare the input：Prepare the content or file to process: paste text or drop a file onto the page (this tool belongs to “Dev Tools”).
3. Provide the input：Paste your content into the input box or drop a file onto the page; you can also click “Sample” to try example data first.
4. Adjust options and run：Adjust the options if needed, then click the process / convert / generate button.
5. Get the result：Everything runs locally in your browser; copy or download the result — your files are never uploaded.

FAQ

Will regex parentheses break?

Bracket counting may misjudge and shift; this tool only does basic indentation, so verify complex code carefully.

Will it change code logic?

No — only whitespace and line breaks change.

More tools in Dev Tools

• Unix Timestamp Converter — Convert sec/ms timestamps to dates, multi-timezone.
• Cron Expression Parser — Explain cron and predict next run times.
• Regex Tester — Live match highlight, group view and common regex library.
• QR Code Generator — Generate QR codes with custom color and error correction.
• QR Code Reader — Upload an image or screenshot to read its QR content.
• Code Diff — Show line-level diff of two code snippets side by side.
• SQL Formatter — Uppercase SQL keywords and indent for readability.
• CSS Formatter — Beautify and minify CSS code.
• HTML Beautifier — Indent and minify HTML source.
• Naming Style Converter — Camel, snake, kebab and constant case conversion.
• Color Converter — HEX/RGB/HSL conversion and palette generation.
• CSS Loading Spinners — Pick a loading spinner and copy ready-made HTML/CSS.
• View Source — Paste HTML source for structured viewing and beautifying.
• User-Agent Parser — Parse OS and engine info from a browser UA.
• Local Info — View local IP, screen and browser environment.
• Xget URL Accelerator — Convert raw URLs like GitHub, npm, Docker and AI APIs into Xget-accelerated links in one click.