Code Beautifier - JavaScript, HTML, CSS, SQL Formatter

Frequently asked questions

What is a code beautifier and why do I need one?

A code beautifier (also called code formatter or prettifier) is a tool that automatically formats source code according to style conventions to improve readability and consistency. When developers write code quickly or when code is minified for production, it often lacks proper indentation, spacing, and line breaks - making it difficult to read and maintain. Code beautifiers transform messy, compressed, or inconsistently formatted code into clean, properly indented, readable code. Benefits include: **Improved Readability** - Properly formatted code is easier to understand, debug, and review. **Consistency** - Ensures all code follows the same style guide across your entire codebase. **Faster Development** - Spend less time manually formatting and more time writing logic. **Better Collaboration** - Team members can read and understand each other's code more easily. **Easier Debugging** - Well-formatted code makes errors and logic issues more visible. This tool supports JavaScript (ES6+), TypeScript, HTML, CSS, SCSS, SQL, and JSON with customizable formatting options like indentation size, line width, semicolons, quote style, and more.

How do I use the Code Beautifier?

Using the Code Beautifier is simple and fast: (1) **Select Language** - Click the language button for your code: JavaScript, TypeScript, HTML, CSS, SCSS, SQL, or JSON. The tool auto-detects language from file extensions when you upload files. (2) **Input Code** - Paste your code directly into the input area, upload a code file (.js, .html, .css, .sql, etc.), or click 'Load Sample' to test with example code. (3) **Configure Options** - Choose your preferred indentation (2 spaces, 4 spaces, or tabs), line width (80, 100, or 120 characters), and language-specific options like semicolons and quote style for JavaScript. (4) **Format** - Click 'Beautify' to format your code with proper indentation and spacing, or click 'Minify' to compress it by removing unnecessary whitespace. (5) **Review Output** - See your formatted code with syntax highlighting and line numbers in the output panel. (6) **Copy or Download** - Click 'Copy' to copy the formatted code to your clipboard, or 'Download' to save it as a file. The tool runs entirely in your browser - no server uploads, completely private and secure.

What's the difference between beautify and minify modes?

Beautify and minify are opposite operations for different purposes: **Beautify Mode** formats code for human readability by adding proper indentation, line breaks, and spacing according to style conventions. It expands compressed code, adds consistent indentation levels, places opening braces on appropriate lines, spaces operators and keywords properly, and wraps long lines at the configured width. Use beautify for development, code review, debugging, learning from others' code, and maintaining codebases. Example: `function test(){return true;}` becomes properly formatted with line breaks and indentation. **Minify Mode** compresses code for production by removing all unnecessary whitespace, line breaks, and comments to reduce file size. This improves page load times and bandwidth usage. Minified code is hard to read but functionally identical and much smaller. Use minify for production JavaScript and CSS, API responses, reducing bandwidth costs, and improving website performance. Example: properly formatted code becomes `function test(){return true;}` in one line. For development, always use beautify. For production deployment, always use minify to optimize performance.

What languages and file types are supported?

The Code Beautifier supports multiple programming languages and file formats commonly used in web development: **JavaScript** - Modern ES6+, ES2015+, including arrow functions, async/await, destructuring, spread operators, classes, and JSX for React. File extensions: .js, .jsx, .mjs. **TypeScript** - Full TypeScript support including type annotations, interfaces, generics, enums, and decorators. File extensions: .ts, .tsx. **HTML** - HTML5 with proper tag formatting, attribute alignment, and configurable whitespace handling. File extension: .html. **CSS** - Standard CSS including modern features like custom properties (variables), Grid, Flexbox, and nested selectors. File extensions: .css. **SCSS** - Sass/SCSS preprocessor syntax with nesting, variables, mixins, and functions. File extensions: .scss. **SQL** - Standard SQL with support for SELECT, INSERT, UPDATE, DELETE, JOINs, subqueries, and complex queries. Formats keywords, indentation, and clause alignment. File extension: .sql. **JSON** - JavaScript Object Notation for data structures and configuration files. File extension: .json. File uploads automatically detect the language from the file extension, making it easy to format entire code files at once.

What formatting options can I customize?

The Code Beautifier offers comprehensive formatting options to match your style preferences and project requirements: **Universal Options (All Languages)** - **Indentation**: Choose 2 spaces (common for web), 4 spaces (common for enterprise), or tabs (8 spaces). **Line Width**: Set maximum line length before wrapping - 80 characters (traditional), 100 characters (balanced), or 120 characters (modern wide screens). **JavaScript/TypeScript Options** - **Semicolons**: Add semicolons at statement ends (recommended for consistency), remove them (cleaner look), or preserve existing style. **Quote Style**: Use single quotes ('text') for cleaner look or double quotes ("text") for consistency with JSON. **Bracket Spacing**: Add spaces inside object braces - `{ key: value }` vs `{key: value}`. **Arrow Functions**: Always use parentheses `(x) => x` or omit when possible `x => x`. **Trailing Commas**: Add trailing commas in multi-line arrays/objects for cleaner diffs. **HTML Options** - Whitespace sensitivity for inline elements. **SQL Options** - Automatic keyword capitalization (SELECT, FROM, WHERE). All options are saved in browser localStorage, so your preferences persist between sessions.

How does syntax highlighting work?

Syntax highlighting color-codes different parts of your code to make it easier to read and understand by visually distinguishing keywords, strings, numbers, comments, and other code elements. This tool uses Prism.js, a powerful syntax highlighting library, to provide accurate, language-aware coloring. **Color Scheme** - **Keywords** (if, function, class, const): Highlighted in red/pink to stand out. **Strings** ('text', "text"): Shown in green for easy identification of text data. **Numbers** (123, 45.67): Displayed in blue for numeric values. **Comments** (// comment, /* comment */): Shown in gray/muted color since they're not executable code. **Operators** (+, -, =, =>): Clearly visible for logic understanding. **Functions** (myFunction): Highlighted in purple for function calls and definitions. **Properties/Attributes** (object.property): Distinct color for object members. The highlighting adapts to light and dark modes - using brighter colors in dark mode for better contrast and readability. Syntax highlighting helps you spot errors (like unclosed strings), understand code structure at a glance, identify different code elements quickly, and learn programming patterns by seeing how code is structured.

Can I format minified or compressed code?

Yes! One of the primary use cases for this code beautifier is formatting minified or compressed code back into readable form. Minified code from production websites, CDN libraries, or build tools is compressed into one or two lines with all whitespace removed - extremely hard to read but perfect for this tool to format. **Common Scenarios** - **Debugging Production Code**: Copy minified JavaScript from a website's source, paste it into the beautifier, and instantly see the formatted version with proper indentation to understand what it's doing or find bugs. **Reading Library Code**: Format minified libraries from CDNs (jQuery, React, etc.) to study their implementation. **Reverse Engineering**: Understand how third-party scripts work by beautifying their minified code. **Recovery**: If you lost the original formatted version and only have minified code, recover readable code instantly. **How It Works**: The beautifier parses the code syntax tree and reconstructs proper formatting with indentation, line breaks, and spacing while preserving all functionality. Comments are lost in true minification (removed during minification) but the code logic and structure are restored. For best results, select the correct language before formatting so the tool applies appropriate formatting rules.

Is my code secure when using this tool?

Absolutely secure - your code never leaves your browser. This Code Beautifier operates 100% client-side using JavaScript that runs entirely in your web browser. Zero server processing, zero data transmission, zero external storage. **Privacy Features** - **No Server Uploads**: Code is never sent to any server or external service. All formatting happens locally using Prettier and sql-formatter libraries loaded in your browser. **No Data Storage**: Your code is not saved, logged, or stored anywhere on external servers. Only your formatting preferences (indentation, options) are saved in your browser's localStorage on your device. **Offline Capable**: Once the page loads, the tool works completely offline. You can disconnect from the internet and continue formatting code. **No Tracking**: No analytics, no tracking pixels, no session recording. Your code remains completely private. **Open Source Libraries**: Uses Prettier (MIT license) and sql-formatter (MIT license) - open source, audited, trusted by millions of developers worldwide. This privacy-first architecture makes the tool completely safe for formatting proprietary code, confidential client code, unreleased features, company intellectual property, or any sensitive source code. Ideal for developers in regulated industries (finance, healthcare, government) where code must remain on-premises. You can safely format code containing API keys, database credentials, or business logic without privacy concerns.

What are the code statistics shown?

After formatting your code, the tool displays useful statistics to help you understand the impact of formatting and make informed decisions about code optimization. **Original Size (bytes)** - The byte size of your input code before formatting. Measured in bytes, where 1 KB = 1,024 bytes. This shows how much space the code takes when transferred over networks or stored in files. **Formatted Size (bytes)** - The byte size after beautification. Usually larger than minified code but more readable. Shows the cost of readability in terms of file size. **Input Lines** - Number of lines in your original code. Minified code often has just 1-2 lines. **Output Lines** - Number of lines after formatting. Properly formatted code typically has many more lines for readability. **Size Comparison** - Compare original vs formatted to understand the tradeoff between readability (more bytes) and performance (fewer bytes). For production code, minified is typically 40-60% smaller than formatted. For development, formatted code is essential despite larger size. **Practical Use** - Use statistics to decide whether to minify before deployment, estimate bandwidth savings from minification, understand the size impact of code changes, or compare formatting styles (2-space vs 4-space indentation). The statistics update automatically each time you format code, making it easy to experiment with different options and see their impact.

Can I save my formatting preferences?

Yes! The Code Beautifier automatically saves your formatting preferences in your browser's localStorage, so your settings persist across sessions. **Saved Preferences** - **Language Selection**: Your last selected language (JavaScript, HTML, CSS, SQL, etc.) is remembered. **Mode**: Whether you last used Beautify or Minify mode. **Indentation**: Your preferred indent size (2, 4, or 8 spaces). **Line Width**: Your chosen maximum line length (80, 100, or 120). **JavaScript Options**: Semicolons preference, single/double quotes, bracket spacing, arrow function style. **All Toggles**: All checkbox options are saved. **How It Works** - Preferences are saved automatically whenever you change an option. No manual save action required. Settings are stored only in your browser on your device - never sent to servers. Each browser stores preferences separately (Chrome settings don't transfer to Firefox). Clearing browser data/cache will reset preferences to defaults. **Benefits** - No need to reconfigure options every time you use the tool. Consistent formatting across all your code files. Faster workflow - open the tool and start formatting immediately. Privacy-friendly - preferences stay on your device. To reset to defaults, clear your browser's localStorage or simply change the options to your preferred defaults.

What are best practices for code formatting?

Following code formatting best practices ensures your code is readable, maintainable, and consistent across your team and projects. **Consistency Is Key** - Choose a style guide (Airbnb, Google, Standard) and stick to it across your entire codebase. Use the same indentation everywhere (2 or 4 spaces is standard). Apply consistent quote style, bracket spacing, and semicolon usage. Inconsistent formatting makes code harder to read and suggests poor maintenance. **Indent Size** - 2 spaces: Popular in web development (React, Vue, Angular) because it's compact and readable. 4 spaces: Common in backend development (Python, Java, C#) for clearer visual hierarchy. Tabs: Some teams prefer tabs for accessibility (developers can set their own visual width). Never mix spaces and tabs in the same project. **Line Length** - Keep lines under 80-120 characters. Shorter lines are easier to read, fit on smaller screens, and work better with side-by-side diff tools. Modern conventions lean toward 100-120 characters for wider displays. **Format Before Committing** - Always format code before committing to version control (Git). Prevents formatting-only changes in diffs that obscure real changes. Add a pre-commit hook to auto-format on commit. Use tools like ESLint, Prettier, or StyleLint to enforce formatting automatically. **Production Optimization** - Beautify code for development (readable, debuggable). Minify code for production (smaller files, faster load times). Use build tools (Webpack, Vite, Rollup) to automate minification in deployment pipelines. Keep source maps for debugging minified production code.