Professional Code Formatter & Beautifier
Format and beautify HTML, JSON, CSS, JavaScript, and XML with syntax highlighting — 100% client-side
Why Developers Need a Code Formatter
The Messy Code Problem
Unformatted code is a maintenance nightmare. Minified JavaScript libraries, compressed JSON API responses, and copy-pasted HTML snippets are unreadable. Without proper indentation and structure, debugging takes 3x longer, code reviews become painful, and collaboration suffers. Developers waste hours manually formatting code instead of building features.
Instant Formatting Solution
Help Tools' Code Formatter processes code entirely in your browser using industry-standard beautification libraries (js-beautify). It supports 5 languages with customizable indent sizes, line wrapping, and minification. With syntax highlighting powered by highlight.js, formatted code is readable at a glance. Used by 12,000+ developers monthly for debugging, code reviews, and learning.
What Makes Our Code Formatter Different
- 100% Client-Side Processing: Your code never leaves your browser. No server uploads, no network requests, no data logs. Paste sensitive API responses or proprietary code without privacy concerns.
- Multi-Language Support: One tool handles HTML, JSON, CSS, JavaScript, and XML. No switching between separate formatters — select the language and format instantly.
- Syntax Highlighting: Formatted code displays with color-coded syntax using highlight.js. Keywords, strings, and brackets are visually distinct, making structure immediately clear.
- Customizable Options: Choose 2-space, 4-space, or tab indentation. Enable line wrapping for long lines. Options match your team's style guide or personal preferences.
- Minify Mode: Switch between beautify and minify modes. Format code for readability or compress it for production — same tool, opposite functions.
Format Your Code
Formatted code will appear here...
Complete Guide: Code Formatting Best Practices
HTML Formatting
Why format HTML: Unformatted HTML is a debugging nightmare. Without proper indentation, finding unclosed tags or misplaced elements takes hours. Formatted HTML reveals document structure at a glance.
Common HTML formatting needs:
- Minified framework output: React, Vue, and Angular dev tools export minified HTML. Our formatter expands it with proper nesting and indentation.
- Template debugging: Blade, Twig, and Jinja templates often have complex nesting. Formatting reveals block structure and inheritance chains.
- Email HTML: Email clients require inline styles and table-based layouts. Formatting makes this spaghetti code readable for editing.
- Copy-pasted snippets: Stack Overflow and documentation code loses formatting. Restore structure before integrating into projects.
Pro Tip: Enable "Wrap long lines" when formatting HTML with long attribute lists. This breaks lines at 80 characters for better readability in code reviews.
JSON Formatting
Why format JSON: API responses, config files, and database exports return single-line JSON that's impossible to parse visually. Formatting JSON reveals data structure and nested relationships.
Common JSON use cases:
- API debugging: REST and GraphQL responses return compressed JSON. Format it to inspect nested objects, arrays, and data types.
- Config file editing: package.json, tsconfig.json, and .eslintrc files are minified by default. Format before editing to avoid syntax errors.
- Database exports: MongoDB and Firebase export JSON dumps. Formatting makes data structure visible for migration or analysis.
- Validation: The formatter parses JSON before formatting. If it fails, you've found a syntax error (missing comma, unclosed bracket).
Minification Use Case: After editing a formatted JSON config, minify it before deployment. Smaller file size = faster parsing by applications.
CSS Formatting
Why format CSS: Production CSS is minified to reduce file size. Debugging or modifying minified CSS is impossible without formatting. Proper formatting reveals selector hierarchy and property organization.
Common CSS formatting scenarios:
- Minified libraries: Bootstrap, Tailwind, and other frameworks ship minified CSS. Format the source to understand how components are styled.
- Browser DevTools inspection: Computed styles in DevTools show minified CSS from external stylesheets. Copy and format to analyze specificity and cascading.
- Legacy code maintenance: Old projects often have single-line CSS with no spacing. Formatting reveals redundant rules and refactoring opportunities.
- CSS-in-JS output: Styled-components and Emotion generate CSS strings. Format the output to debug generated styles.
Best Practice: Use 2-space indentation for CSS. Most style guides (Airbnb, Google) recommend 2 spaces for CSS/SCSS to save horizontal space.
JavaScript Formatting
Why format JavaScript: Minified JavaScript from CDNs is unreadable. Formatting is essential for debugging third-party libraries, analyzing bundle output, and learning from open-source code.
Common JavaScript formatting needs:
- Library source inspection: jQuery, Lodash, and other libraries minify source code. Format to understand implementation details for debugging or learning.
- Webpack/Rollup bundles: Build tools output minified bundles. Format the bundle to trace how modules are concatenated and tree-shaken.
- Bookmarklets: Browser bookmarklets are single-line JavaScript. Format to edit complex bookmarklet logic.
- Code snippets: Inline
<script>tags in HTML are often unformatted. Extract and format for analysis.
Limitation: This formatter beautifies syntax but doesn't rename minified variables (e.g., a, b). For that, use source maps or specialized tools like Prettier with AST parsing.
XML Formatting
Why format XML: XML configuration files, SOAP responses, and SVG code are often single-line or poorly indented. Formatting reveals document structure, nested elements, and attribute organization.
Common XML use cases:
- SOAP API responses: Web services return XML responses. Format to extract data from nested elements.
- SVG optimization: Exported SVG from design tools is unformatted. Format before hand-editing paths or attributes.
- Config files: Android layouts (XML), Maven pom.xml, and .csproj files benefit from formatting for easier editing.
- RSS/Atom feeds: Feed XML is machine-generated and minified. Format to inspect feed structure and validate elements.
Pro Tip: XML and HTML use the same formatter engine. Choose "XML" for strict XML documents and "HTML" for HTML5 documents with loose syntax.
💡 Real-World Use Cases
Debugging API Responses
Scenario: Your API returns a 500-character JSON blob. You need to find why a nested field is null.
Solution: Paste the JSON, format it, and the nested structure becomes visible. Instantly locate the problematic field and inspect its parent objects.
Code Review Preparation
Scenario: A teammate committed unformatted code. The PR is unreadable and blocking merge.
Solution: Copy the file content, format it locally, and compare against the formatted version. Review logic instead of fighting indentation.
Learning Third-Party Libraries
Scenario: You want to understand how a popular library implements a feature, but the source is minified.
Solution: Download the minified source, format it, and study the implementation. Learn patterns and techniques from production code.
Production Optimization
Scenario: Your formatted JSON config is 50KB. Every byte counts for performance.
Solution: Use the Minify button to compress whitespace and newlines. Deploy the minified version for 30-40% size reduction.
Code Formatting Best Practices
DO: Format Before Committing
Run code through the formatter before git commits. Consistent formatting prevents merge conflicts caused by whitespace differences and makes diffs meaningful.
DO: Use Team Style Guide
Match indent size to your team's standards. If your team uses 4-space indentation, configure the formatter accordingly. Consistency across the codebase is more valuable than personal preference.
DO: Validate After Formatting
For JSON, format to validate syntax. If formatting fails, you've found a syntax error (missing comma, unclosed bracket). Fix the error and format again.
DON'T: Format Production Files Directly
Never format minified files in production without testing. Formatting changes whitespace and line breaks, which can break code that relies on specific formatting (rare, but possible in JS).
DON'T: Ignore Linter Rules
This formatter beautifies syntax but doesn't enforce linting rules (semicolons, quotes, etc.). Use ESLint or Prettier for comprehensive code style enforcement.
DON'T: Format Sensitive Data Publicly
Even though this tool is client-side, avoid pasting API keys, passwords, or PII into any online tool. Format locally or remove sensitive data first.
Quick Start Guide
Paste Your Code
Enter unformatted or minified code in the input area
Select Language
Choose HTML, JSON, CSS, JavaScript, or XML
Configure Options
Set indent size and line wrapping preferences
Format & Copy
Click Format, then copy the beautified result
Usage Statistics
Frequently Asked Questions
Everything you need to know about our code formatter
Yes, your code is completely safe. This tool processes code 100% client-side using JavaScript libraries (js-beautify and highlight.js) that run in your browser. Your code never leaves your device — there are no server uploads, no network requests, and no data logs. You can verify this by opening your browser's Network tab (F12) and watching for zero outbound requests when formatting.
This design means you can safely format sensitive code (API keys, proprietary logic, database queries) without privacy concerns. We built it this way specifically for security-conscious developers.
Format (Beautify) adds whitespace, indentation, and line breaks to make code human-readable. Use this when debugging, reviewing code, or learning from minified sources.
Minify removes all unnecessary whitespace, comments, and line breaks to reduce file size. Use this when preparing code for production deployment where smaller file sizes improve load times.
Example: A formatted 10KB JSON file becomes ~7KB when minified (30% reduction). Both are functionally identical — minification only affects readability, not execution.
No. This tool beautifies existing valid code but cannot fix syntax errors like missing brackets, unclosed tags, or invalid JSON. However, formatting can help you find syntax errors by revealing structure.
For JSON specifically, the formatter will fail if your JSON is invalid (missing comma, trailing comma, etc.) — this failure itself is useful for identifying where the syntax error occurs. The error message will indicate what went wrong.
For robust syntax error detection and fixing, use a linter like ESLint (JavaScript) or JSONLint (JSON).
Partially. Once the page loads, the formatter libraries (js-beautify, highlight.js) are cached in your browser and the tool will work offline for that session. However, you need an internet connection for the initial page load to download the libraries from CDNs.
For fully offline formatting, consider installing a local code editor with built-in formatting (VS Code, Sublime Text) or command-line tools like prettier or js-beautify via npm.
There's no hard limit imposed by the tool, but browser memory constraints apply. Most browsers can handle files up to 1-2MB without issues. Beyond that, formatting may become slow or crash the tab due to memory usage.
For very large files (>5MB), use command-line tools instead. Install js-beautify via npm (npm install -g js-beautify) and run js-beautify largefile.js -o formatted.js for faster, memory-efficient processing.
This formatter supports 5 languages: HTML, JSON, CSS, JavaScript, and XML. If you're trying to format a different language (Python, PHP, Ruby, etc.), the tool won't have the correct beautification rules and syntax highlighting.
For other languages, use language-specific formatters: Python (Black, autopep8), PHP (PHP-CS-Fixer), Go (gofmt), Rust (rustfmt). Many IDEs also have built-in formatters for dozens of languages.
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Fast, secure, client-side code formatting for developers
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