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Multi-Language Code Beautifier

  1. Tools
  2. /Developer Utilities
  3. /Multi-Language Code Beautifier
48 chars
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48 characters · 4 words · 48 bytes (UTF-8)

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Format, indent, validate, and beautify JSON with custom spacing.

JSONFormatter

This code beautifier formats and auto-indents HTML, CSS, JavaScript, JSON, and SQL in a single interface, so you don't need five separate tools for five different languages. It's designed for developers cleaning up minified or inconsistently indented code, reviewers making a diff more readable, and students learning proper code formatting conventions. Paste in a jumbled block of markup, a compressed stylesheet, or a one-line SQL query, and this js beautifier and html beautifier combo restores consistent indentation, line breaks, and spacing automatically. It's especially handy when you receive code from an external source - a scraped page, an API response, or a colleague's quick copy-paste - and need it readable before you can actually work with it. Formatting runs entirely in your browser, so proprietary or sensitive code is never uploaded anywhere. Paste your code below, select the language, and get clean, readable output instantly.

Features

  • ✓Formats HTML, CSS, JavaScript, JSON, and SQL from one interface
  • ✓Auto-detects likely language based on input content
  • ✓Configurable indentation width (spaces or tabs)
  • ✓Restores readable structure to minified or compressed code
  • ✓Preserves string and comment content during reformatting
  • ✓Instant formatting with no compile step
  • ✓Copy-to-clipboard for the formatted output

Why use this multi-language code beautifier?

  • Instant formatting with no need for local dev tools
  • Fully private - code is processed only in your browser
  • Accurate indentation that follows standard language conventions
  • One tool covers five common languages
  • Free with no signup or file size gatekeeping

Frequently asked questions

Does this beautifier support minified JavaScript?

Yes, it can take heavily minified or single-line JavaScript and reformat it with proper indentation and line breaks.

Can it format JSON with custom indentation?

Yes, you can choose the number of spaces (or tabs) used for indentation when formatting JSON.

Will formatting change the actual behavior of my code?

No, beautification only affects whitespace, indentation, and line breaks - it does not alter logic, values, or functionality.

Does the SQL formatter capitalize keywords automatically?

Yes, standard SQL keywords like SELECT, FROM, and WHERE are typically capitalized and aligned for readability.

Can I beautify a full HTML document with embedded CSS and JS?

Yes, HTML formatting handles nested style and script blocks, indenting them appropriately within the document structure.

Is there a size limit on how much code I can paste?

There's no artificial limit; performance depends on your browser's ability to process the pasted content.

Does this tool also minify code, or only beautify?

This tool focuses on beautifying and formatting; use the dedicated JS, CSS, or HTML minifier tools for the reverse operation.

From the blog

How to Format and Beautify Minified JSON

How to format JSON: beautify a minified payload in the browser, in your editor, or from the command line — plus indentation choices and when to keep it minified.