Format JS & JSON code instantly for free. Paste your minified, obfuscated, or messy JavaScript
or JSON and get clean, readable, perfectly indented code in seconds.
A JavaScript beautifier online tool — also called a JS formatter, JS prettifier, or JS code cleaner — automatically reformats JavaScript code to make it readable, consistent, and properly indented. It converts compressed or minified JS back to a human-readable format and can also handle JSON data structures.
JavaScript is frequently minified before deployment — all whitespace stripped, variables renamed, logic compressed — to reduce file size. When you need to read, debug, or analyze minified JS from a website, library, or API response, a JS beautifier reverses that compression instantly.
ToolsVenue's JavaScript Beautifier goes beyond basic formatting. It gives you precise control over brace style, line wrapping, chained method formatting, array indentation, and comma style — making it suitable for enforcing any team style guide.
Debugging minified scripts
Production JS is often minified and unreadable. Beautifying it makes errors, logic flows, and API responses immediately understandable.
Code reviews
Consistently formatted JavaScript is far easier to review. Formatting issues can mask logic errors and slow down the review process.
Working with APIs and JSON
JSON responses from APIs arrive as single-line strings. Beautifying the JSON instantly reveals the data structure, keys, and values.
Learning from examples
When studying third-party libraries or open-source code, beautified formatting makes the logic far easier to follow.
Style guide compliance
Our JS formatter enforces consistent indentation, brace placement, and line length — reducing linting errors and style-related PR comments.
| Feature | What It Does for You |
|---|---|
| Indent Size Control | Choose Tab, 2, 3, 4, or 8 spaces. Aligns perfectly with ESLint, Prettier, and any team-defined style guide setting. |
| Brace Style | Four options: With Control Statement (K&R style), Own Line (Allman style), End Braces On Own Line, or Keep As-Is. Match your team's exact convention. |
| Line Wrap / Max Line Length | Set maximum line length to 40, 70, 80, or 120 characters. Keeps code within viewport width without manual reformatting. |
| Max Preserve Newlines | Control how many consecutive blank lines to preserve: remove all extras, keep 1, 2, 5, 10, or unlimited. |
| Space Before Conditional | Add or remove the space before 'if (condition)' — e.g., if (x) vs if(x). Enforces your preferred conditional style. |
| Keep Array Indentation | Preserve intentional formatting in multi-line array declarations rather than collapsing them to a single line. |
| Break Chained Methods | Place each chained method call on its own line — critical for readable Promise chains, jQuery, and fluent API patterns. |
| Comma-First Style | Move commas to the beginning of each line in multi-line structures — a style convention preferred by some development teams. |
| JSON Beautification | Fully formats JSON data structures with proper indentation, key-value alignment, and bracket formatting — instantly readable. |
| One-Click Copy + Keyboard Shortcut | Copy formatted code instantly, or press Ctrl+Enter to beautify without using the mouse. |
Open the JavaScript Beautifier
Go to toolsvenue.com/javascript-beautifier/ — no account required.
Paste Your Code
Paste your JavaScript or JSON code into the left panel.
Configure Formatting Options
Set your indent size, brace style, line wrap, and any other preferences.
Click Beautify
Click Beautify or press Ctrl+Enter. Clean, formatted code appears in the output panel instantly.
Copy the Result
Click Copy to copy the result to your clipboard, ready to paste into your editor.
The default settings — 2-space indent, standard brace style, 80-char wrap — match the most common JavaScript style guides and work well for the majority of projects without any adjustment.
Format code before commits, clean up quick prototypes, standardize formatting across files before a code review, or expand minified library code you need to read or debug.
API responses often arrive as single-line JSON strings. Paste them into our beautifier to instantly see the full data structure — keys, nested objects, arrays — in a readable format.
Paste any JavaScript snippet from a tutorial or Stack Overflow, beautify it, and see how properly formatted JS should look. This accelerates learning good code structure significantly.
Read and understand the logic in minified production scripts when investigating a bug. Format the JS to trace execution paths, identify conditionals, and locate the source of unexpected behavior.
Deobfuscate and reformat minified or obfuscated scripts to review their functionality. While our tool performs standard beautification (not full deobfuscation), it is often the first step in manual analysis.
ToolsVenue's JavaScript Beautifier handles both JavaScript (.js) files and JSON (.json) data. Here's what each type of formatting does:
| Aspect | JavaScript Formatting | JSON Formatting |
|---|---|---|
| Input | JS functions, classes, logic, variables | Data structures: objects, arrays, strings |
| Formatting Applied | Indentation, brace style, line wrap, spacing | Indentation, key-value alignment, bracket formatting |
| Common Source | Minified library files, API scripts, source code | API responses, config files, data exports |
| Output Use | Readable code for debugging/review | Readable data for inspection/analysis |
| Supported by This Tool | Yes — full JS support | Yes — full JSON support |
| Question | Answer |
|---|---|
| Is this JavaScript beautifier free? | Yes. ToolsVenue's JS Beautifier is completely free with no account, no usage limits, and no download required. |
| Can it format JSON as well as JavaScript? | Yes. Paste either JavaScript code or raw JSON data and the tool will format both correctly. |
| What is the difference between beautifying and minifying JavaScript? | Beautifying expands code for human readability (used during development). Minifying compresses code for smaller file sizes (used before production deployment). Both tools are available free on ToolsVenue. |
| Will beautifying change how my JavaScript works? | No. Beautification only changes whitespace, indentation, and formatting. It never alters variable names, logic, or any functional aspect of the code. |
| Is my JavaScript code sent to a server? | No. All formatting happens locally in your browser. Your code never leaves your device. |
| What brace style should I use? | 'With Control Statement' (K&R style, e.g., if (x) {) is the most common in modern JavaScript. 'Own Line' (Allman style) places braces on their own lines and is preferred by some C-influenced developers. |
| Can I use this to format TypeScript? | The tool is optimized for standard JavaScript and JSON. TypeScript-specific syntax like type annotations and interfaces may not format perfectly, but general TypeScript code structures (functions, classes, conditionals) will format correctly. |
| Does it support modern JavaScript (ES6+)? | Yes. Arrow functions, template literals, destructuring, spread operators, async/await, and all other ES6+ syntax are handled correctly. |
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Paste your JS or JSON, select your formatting preferences, and click Beautify. Clean, readable, perfectly formatted code is ready in under a second.
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