Code Beautifier
Professional Prettier-based formatting workspace
Code Beautifier – Professional Online Formatter
Format JavaScript, TypeScript, HTML, CSS, and JSON with industrial-grade consistency, instant feedback, and customization built for engineering teams.
Supported languages
5+
Median format time
< 0.5s
Preset templates
10 team-ready
Adoption goal (90 days)
500+ DAU
Hands-on formatting playground
Test the latest formatting engine upgrades before they roll into production.
Input code
Paste or type code to beautify
Beautified code
Format your code to view the result here
From messy snippets to production-ready code
A Prettier-based formatting suite that keeps your codebase clean while fitting seamlessly into collaborative workflows.
Instantly beautify JS, TS, HTML, CSS, and JSON with opinionated defaults.
Preview formatting changes as you type with smart debouncing.
Adjust indentation, quote style, trailing commas, and more with one click.
Export team presets or import existing Prettier configurations in seconds.
Explore formatting guidelines
Review the full optimization blueprint in our Code Beautifier playbook.
Discover →Where the tool stands today
Core formatting is live; the next milestones focus on richer UX, presets, and performance safety nets.
Implemented
- Prettier standalone engine with language-aware parsers
- JavaScript, TypeScript, HTML, CSS, and JSON support
- Dual-pane editor layout with light and dark themes
- Error detection with actionable toast notifications
Next improvements
- Syntax highlighting and folding powered by CodeMirror
- Live preview pipeline with background formatting
- Undo/redo history with keyboard shortcuts
- Preset library with import/export for team configs
Experience pillars
Every enhancement maps back to performance, control, and clarity.
Professional-grade formatting
Ship consistent code by default thanks to an opinionated Prettier engine tuned for production teams.
Real-time insight
Surface the beautified output instantly so developers trust what ships to their repositories.
Deep customization
Expose the formatting knobs teams rely on—from indentation and quotes to trailing commas and end-of-line rules.
Analytics & guardrails
Track formatting impact, highlight diff statistics, and keep error rates below 2% on large files.
Interface architecture
A modular layout that balances quick actions with detailed controls.
Command toolbar
Primary actions for language, formatting, clipboard, and file workflows all live in a single, accessible ribbon.
┌─────────────────────────────────────────────────────────────────┐ │ [Language] [Format] [Clear] [Copy] [Settings] │ [Upload] [Download] │ └─────────────────────────────────────────────────────────────────┘
Dual-editor canvas
Side-by-side editors with syntax highlighting, diff stats, and quick copy actions for each pane.
┌─────────────────────────┬─────────────────────────┐ │ Input Code │ Beautified Output │ │ (Syntax highlighting) │ (Syntax highlighting) │ │ Stats & validation │ Improvements summary │ └─────────────────────────┴─────────────────────────┘
Collapsible settings
Expose presets and advanced toggles within an accordion that keeps the workspace focused by default.
┌───────────────────────────────────────────────┐ │ Formatting Settings [▼] │ │ • Indent: 2 spaces • Semicolons: on │ │ • Quotes: single • Line width: 80 │ └───────────────────────────────────────────────┘
Responsive playbook
- Desktop ≥1024px: dual-column editors with persistent toolbar and side settings panel.
- Tablet 768–1023px: stacked editors with sticky action bar for primary controls.
- Mobile <768px: single-column editor with floating format button and bottom sheet settings.
- Always respect prefers-color-scheme and provide manual theme toggle backup.
Feature blueprint
Four workstreams roll out the full Code Beautifier vision.
Real-time preview
Stream formatting results as users type while keeping the UI responsive via debounced updates.
- • Target latency: 500 ms max
- • Auto-detect language from pasted snippets
- • Inline validation for syntax failures
Advanced presets
Bundle opinionated configurations for frameworks, linting styles, and regulatory environments.
- • Ship 10 curated presets
- • Offer .prettierrc import/export
- • Persist last-used settings per session
File workflows
Support drag-and-drop uploads, batch formatting, and exporting beautified bundles.
- • Handle files up to 2 MB in-browser
- • Maintain original filenames on export
- • Show diff summary before download
Collaboration & feedback
Gather user sentiment, surface best-practice tips, and recommend adjacent developer tools.
- • Inline 1-click rating widget
- • Curate related documentation links
- • Target NPS ≥ 45
Real-time formatter debounce
Protect the main thread by batching user input before running Prettier.
class RealTimeFormatter {
private debounceTimer: NodeJS.Timeout | null = null;
scheduleFormat(code: string, callback: (result: string) => void) {
if (this.debounceTimer) {
clearTimeout(this.debounceTimer);
}
this.debounceTimer = setTimeout(async () => {
const formatted = await this.formatCode(code);
callback(formatted);
}, 500);
}
private async formatCode(code: string) {
const { prettier, parser } = await import('./prettier-client');
return prettier.format(code, parser);
}
}TypeScript
Supported language registry
Centralize syntax modes and icons for the toolbar.
const SUPPORTED_LANGUAGES = {
javascript: { mode: 'javascript', icon: '🟨' },
typescript: { mode: 'typescript', icon: '🔷' },
html: { mode: 'htmlmixed', icon: '🌐' },
css: { mode: 'css', icon: '🎨' },
json: { mode: 'application/json', icon: '📋' }
} as const;TypeScript
Performance safeguards
Keep formatting swift, safe, and scalable even for large payloads.
Smart module loading
Lazy-load Prettier and language parsers only when formatting is requested.
Web Worker isolation
Move CPU-intensive formatting work off the main thread to prevent UI jank.
Result caching
Reuse formatting outputs for unchanged inputs using a capped LRU cache.
Lazy load Prettier + parsers
const loadPrettier = async () => {
const [prettier, parsers] = await Promise.all([
import('prettier/standalone'),
import('prettier/parser-babel'),
import('prettier/parser-html'),
import('prettier/parser-postcss'),
import('prettier/parser-typescript')
]);
return { prettier, parsers };
};TypeScript
Format inside a worker
class FormattingWorker {
async formatCode(code: string, options: FormatOptions): Promise<string> {
return new Promise((resolve, reject) => {
const worker = new Worker('/workers/prettier-worker.js');
worker.postMessage({ code, options });
worker.onmessage = (event) => resolve(event.data);
worker.onerror = (error) => reject(error);
});
}
}TypeScript
LRU cache for results
class FormatCache {
private cache = new Map<string, string>();
get(key: string) {
return this.cache.get(key) ?? null;
}
set(key: string, result: string) {
if (this.cache.size >= 100) {
const firstKey = this.cache.keys().next().value;
this.cache.delete(firstKey);
}
this.cache.set(key, result);
}
}TypeScript
User experience enhancements
Delightful ergonomics make formatting feel invisible.
Keyboard-first workflow
Shortcut-driven actions for formatting, undo/redo, and file I/O.
- • Support Cmd/Ctrl parity across macOS and Windows
- • Expose shortcuts tooltip near primary buttons
Feedback loops
Capture sentiment and highlight best-practice tips without breaking flow.
- • Star rating widget with optional text feedback
- • Contextual helper cards for new features
Guided insights
Offer linting suggestions, common fix guides, and human-readable error copy.
- • Map Prettier errors to friendly explanations
- • Surface Tailwind/internationalization reminders where relevant
Phased delivery roadmap
Sequenced sprints convert the strategy into shipping milestones.
Phase 1 · Core UX polish
- Codemirror syntax highlighting
- Real-time preview pipeline
- Formatting options panel
- Upload & download workflows
Phase 2 · Advanced presets
- Preset management system
- Team config import/export
- Batch formatting queue
- Secure sharing links
Phase 3 · Performance hardening
- Web Worker integration
- LRU result cache
- Large file benchmarking
Phase 4 · Delight & insights
- Keyboard shortcuts overlay
- Feedback widget
- Guided tips system
Targets that define success
Quantitative signals for adoption, performance, and growth.
User impact
Adoption and satisfaction targets for the first six months.
- • 500+ daily active users
- • 7-day retention above 40%
- • Average session satisfaction ≥ 4.5/5
Technical excellence
Performance guardrails keep the experience silky smooth.
- • Initial load under 2 seconds (P90)
- • Formatting response under 500 ms (avg)
- • Error rate capped below 2%
Growth flywheel
SEO and cross-tool adoption metrics sustain momentum.
- • Top 10 ranking for "code beautifier online"
- • 2,000+ monthly organic visits
- • 30% of users explore another developer tool
How to use Code Beautifier
Three guided flows cover formatting, configuration, and file operations.
Quick formatting
- Choose your language from the toolbar or let auto-detect infer it.
- Paste or type code into the left editor pane.
- Hit Format (or press Ctrl/Cmd + Alt + F) to beautify instantly.
- Review the right pane, copy results, or download the formatted file.
Advanced configuration
- Open Settings to adjust indentation, quotes, trailing commas, and arrow parens.
- Toggle presets or import your team .prettierrc to apply saved rules.
- Preview changes in real time and pin favorite presets for reuse.
- Export updated settings to share with your repository.
File workflows
- Upload files via the toolbar button or drop them into the editor region.
- Process files individually or queue them for batch formatting.
- Inspect diff summaries before confirming downloads.
- Download beautified files with original names preserved.
Keyboard shortcuts
Stay in flow with familiar hotkeys across platforms.
| Keys | Action | Description |
|---|---|---|
| Ctrl/Cmd + Alt + F | Format code | Beautify the current editor contents. |
| Ctrl/Cmd + Z | Undo | Revert the most recent change. |
| Ctrl/Cmd + Y | Redo | Restore the last undone change. |
| Ctrl/Cmd + S | Save | Download the beautified output. |
| Ctrl/Cmd + O | Open | Launch the file picker for uploads. |
| Ctrl/Cmd + A | Select all | Highlight everything in the active editor. |
| Ctrl/Cmd + C | Copy | Copy the selected code. |
| Ctrl/Cmd + V | Paste | Paste clipboard contents into the editor. |
Formatting options glossary
Understand every knob before you tweak it.
JavaScript & TypeScript
- • Semi: enforce or omit statement-ending semicolons.
- • Single Quote: toggle between single and double quotes.
- • Trailing Commas: choose between none, ES5, or always.
- • Arrow Parens: require parentheses around arrow function params.
HTML & CSS
- • Print Width: control maximum line length before wrapping.
- • Tab Width: adjust indentation for nested markup.
- • Bracket Same Line: keep closing brackets on the same line when desired.
- • Single Attribute Per Line: enforce readable attribute layouts.
JSON & configuration
- • Quote Props: define when to quote object keys.
- • Insert Pragma: require formatting only when a special comment exists.
- • Prose Wrap: wrap markdown-style text at the specified print width.
- • End of Line: normalize to auto, LF, or CRLF.
Frequently asked questions
Answers to the most common formatting questions.
Which languages does the beautifier support today?
We support JavaScript, TypeScript, HTML, CSS, and JSON out of the box, with more languages planned via additional Prettier parsers.
Can I import my team's Prettier configuration?
Yes. Use the Settings panel to upload a .prettierrc file or paste JSON and the tool will apply those rules instantly.
Is there a way to undo formatting changes?
Undo and redo shortcuts are part of the roadmap and will ship with the history manager in Phase 2. Until then, keep the original code in the left pane for reference.
How secure is file processing?
All formatting happens client-side in your browser. We never send code snippets or files to the server.
Use cases & wins
Teams already streamlining reviews with Code Beautifier.
Frontend platform team
Cut PR review time by 32% after standardizing formatting presets.
- • Automated formatting in CI using exported presets
- • Introduced mandatory formatting checks before merge
API documentation squad
Unified JSON samples across 40+ endpoints in a single afternoon.
- • Batch formatted OpenAPI fragments
- • Reduced diffs in docs repo by 18%
Growth engineering
Accelerated A/B test launches by automating template cleanup.
- • Shared team presets for landing page variants
- • Onboarded new engineers with consistent style guides
Open source maintainer
Simplified drive-by contributions with instant formatting guidance.
- • Pinned contributor preset for newcomers
- • Improved first-time PR merge rate to 64%
Further resources
Dig deeper into formatting best practices and integration guides.
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