JSON Formatter & Multi-Format Converter

The Ultimate JSON Toolkit - 20+ Format Conversions & Code Generation

Features • Quick Start • Documentation • Demo

✨ Overview

A powerful, browser-based JSON toolkit that supports 20+ format conversions, code generation, and advanced JSON operations. 100% client-side processing - your data never leaves your browser!

🌟 Key Highlights

🎯 Smart Input Detection: Auto-detects JSON, URL params, XML, YAML & 15+ formats
🔄 20+ Conversions: JSON ↔ YAML/XML/CSV/HTML/PDF/Table & more
💻 Code Generation: TypeScript, Dart, Go, Rust, Python, C, JSON Schema
🔍 Advanced Tools: JSON compare, diff, field extraction, validation
🌐 Bilingual: Full English & Chinese support
📱 Mobile-Optimized: Perfect on all devices
🔒 Privacy-First: 100% browser-based, no server uploads
⚡ Lightning Fast: Handles 10MB+ JSON files effortlessly

🚀 Quick Start

Installation

# Clone the repository
git clone https://github.com/cenyi/neo-dev-toolkit.git

# Navigate to project directory
cd neo-dev-toolkit

# Install dependencies
npm install

# Start development server
npm run dev

# Build for production
npm run build

# Preview production build
npm run preview

Quick Demo

Open your browser and navigate to http://localhost:4321
Paste any JSON into the editor
Watch it auto-format and validate instantly
Click any conversion button to transform your data

🎯 Features

Core JSON Operations

1. Smart Input Detection 🧠

Automatically detects and parses:

✅ Standard JSON
✅ URL Parameters (query strings)
✅ XML documents
✅ YAML files
✅ JSON with comments
✅ Minified JSON

Example: Just paste ?name=John&age=30 and it auto-converts to JSON!

2. JSON Formatting & Validation ✨

Real-time syntax highlighting
Error detection with line numbers
Auto-formatting on paste
Collapsible tree view
Line numbers navigation

3. JSON Comparison & Diff 🔄

Side-by-side comparison
Visual diff highlighting:
- 🟢 Green: Added
- 🔴 Red: Removed
- 🟡 Yellow: Modified
Perfect for API testing and config changes

4. Field Extraction 🔍

Use JavaScript expressions to extract data:

// Extract nested field
obj => obj.user.name

// Extract from array
obj => obj.items[0].id

// Transform data
obj => obj.users.map(u => u.email)

// Filter and map
obj => obj.items.filter(i => i.price > 100).map(i => i.name)

🔄 Data Format Conversions

JSON to YAML

Convert JSON to YAML format with proper indentation:

name: John Doe
email: [email protected]
age: 30
address:
  street: 123 Main St
  city: New York

JSON to XML

Generate XML with proper structure and escaping.

JSON to CSV/Excel

Convert JSON arrays to CSV format
Handle nested objects
Excel-compatible output
One-click copy to clipboard

JSON to HTML

Generate formatted HTML with syntax highlighting:

<!DOCTYPE html>
<html>
<head><title>JSON Data</title></head>
<body>
<pre class="json-key">"name"</pre>: <pre class="json-string">"John"</pre>
...
</body>
</html>

JSON to PDF

Export JSON as PDF via browser print with formatting preserved.

JSON to Table

Visualize JSON data as beautiful HTML tables:

Arrays become row-based tables
Objects become key-value tables
Type-based color coding
Responsive design

💻 Code Generation

TypeScript Interface

interface UserData {
  name: string;
  email: string;
  age: number;
  address: {
    street: string;
    city: string;
  };
}

Dart Class (Flutter)

class UserData {
  String name;
  String email;
  int age;
  Address address;

  UserData({this.name, this.email, this.age, this.address});

  factory UserData.fromJson(Map<String, dynamic> json) {
    return UserData(
      name: json['name'],
      email: json['email'],
      age: json['age'],
      address: Address.fromJson(json['address']),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'name': name,
      'email': email,
      'age': age,
      'address': address?.toJson(),
    };
  }
}

Go Struct

type UserData struct {
    Name    string  `json:"name"`
    Email   string  `json:"email"`
    Age     int     `json:"age"`
    Address Address `json:"address"`
}

Rust Struct

#[derive(Serialize, Deserialize)]
struct UserData {
    name: String,
    email: String,
    age: i64,
    address: Address,
}

Python Dataclass

from dataclasses import dataclass
from typing import Optional

@dataclass
class UserData:
    name: str
    email: str
    age: int
    address: Optional['Address'] = None

C Struct

typedef struct {
    char* name;
    char* email;
    int age;
    Address* address;
} UserData;

JSON Schema

Generate standard JSON Schema for validation:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "name": {"type": "string"},
    "email": {"type": "string"},
    "age": {"type": "number"}
  },
  "required": ["name", "email", "age"]
}

🛠️ Utility Tools

JSON Minify

Remove all whitespace
Compress to single line
Perfect for production APIs

JSON Escape

Escape special characters
Safe for string embedding
One-click copy

Comment Removal

Strip JSON5-style comments
Clean up for production
Preserve data integrity

History Management

Local storage persistence
Quick access to recent JSONs
Privacy-focused (local only)

📖 Usage Examples

Example 1: API Response Processing

{
  "status": "success",
  "data": {
    "users": [
      {"id": 1, "name": "Alice", "email": "[email protected]"},
      {"id": 2, "name": "Bob", "email": "[email protected]"}
    ]
  }
}

Extract all emails:

obj => obj.data.users.map(u => u.email)

Result: ["[email protected]", "[email protected]"]

Example 2: Config File Conversion

YAML Input:

server:
  host: localhost
  port: 8080
  ssl: true

Auto-detects as YAML → Converts to JSON → Generate Go Struct → Copy to code

Example 3: JSON Comparison

Before:

{"name": "John", "age": 30, "city": "NYC"}

After:

{"name": "John", "age": 31, "city": "LA"}

Shows:

🟡 age: 30 → 31
🟡 city: "NYC" → "LA"

Example 4: URL Params Parsing

Input: ?search=json&page=1&limit=10

Auto-converts to:

{
  "search": "json",
  "page": 1,
  "limit": 10
}

Example 5: Array to Table

Input:

[
  {"product": "Laptop", "price": 999, "stock": 50},
  {"product": "Mouse", "price": 29, "stock": 200}
]

Generates Table:

product	price	stock
Laptop	999	50
Mouse	29	200

Example 6: Code Generation Workflow

Paste API response JSON
Click "JSON to TypeScript"
Get interface definition
Use in your TypeScript project
Save hours of manual typing!

🎨 UI Features

Responsive Design

🖥️ Desktop: Multi-column layout with side-by-side editors
📱 Tablet: Optimized 2-column grid
📲 Mobile: Single column with touch-friendly buttons

Button Organization

Buttons are grouped by functionality:

[Basics] | [Data Conversions] | [Code Generation] | [Analysis] | [Utilities]

Basics: Collapse, Expand, Remove Comments, Compress, Escape Data Conversions: XML, YAML, CSV, Excel, HTML, PDF Code Generation: TypeScript, Dart, C, Go, Rust, Python, Schema Analysis: Table, Compare Utilities: Clear, History, Font Size

Smart Features

🎨 Syntax Highlighting: Monaco Editor (VS Code engine)
🌓 Theme Support: Auto dark/light mode
📏 Font Size Control: 11px - 16px adjustable
🔤 Bilingual UI: Instant English/Chinese switch
⌨️ Keyboard Shortcuts: Quick actions support

🔧 Technical Details

Technology Stack

Component	Technology	Version
Framework	Astro	4.15+
Editor	Monaco Editor	Latest
Styling	Native CSS	-
Language	JavaScript	ES6+
Deployment	Cloudflare Pages/Workers	-

Architecture

┌─────────────────────────────────────────┐
│           User Browser                  │
│  ┌──────────────────────────────────┐  │
│  │    Astro Frontend Application    │  │
│  ├──────────────────────────────────┤  │
│  │  • Smart Input Detection          │  │
│  │  • Format Conversion Engine       │  │
│  │  • Code Generation Modules        │  │
│  │  • Monaco Editor Integration      │  │
│  │  • History Management (Local)     │  │
│  └──────────────────────────────────┘  │
│                                         │
│  100% Client-Side Processing           │
│  ❌ No Server Uploads                  │
│  ✅ Complete Privacy                   │
└─────────────────────────────────────────┘

Performance Optimizations

Lazy Loading: Monaco Editor loaded on demand
Debouncing: Smart input processing
Virtual Scrolling: Handle large JSON files
Local Storage: Instant history access
CSS Hardware Acceleration: Smooth animations
Minimal Bundle Size: Optimized dependencies

Browser Compatibility

Browser	Version	Status
Chrome/Edge	90+	✅ Full Support
Firefox	88+	✅ Full Support
Safari	14+	✅ Full Support
Opera	76+	✅ Full Support
Mobile Safari	14+	✅ Full Support
Chrome Mobile	90+	✅ Full Support

📦 File Structure

neo-dev-toolkit/
├── src/
│   ├── pages/
│   │   ├── index.astro          # English homepage
│   │   └── zh/
│   │       └── index.astro      # Chinese homepage
│   ├── components/
│   │   ├── JsonEditor.astro     # Editor component
│   │   ├── JsonTreeView.astro   # Tree view component
│   │   └── Sidebar.astro        # Navigation sidebar
│   ├── layouts/
│   │   └── BaseLayout.astro     # Base layout
│   └── i18n/
│       └── locales.js           # Translations (EN/ZH)
├── public/                      # Static assets
├── dist/                        # Build output
├── astro.config.mjs             # Astro configuration
├── package.json                 # Dependencies
├── README.md                    # This file
├── README.zh.md                 # Chinese version
└── FEATURES_SUMMARY.md          # Feature summary

🚢 Deployment

Cloudflare Pages (Recommended)

Option 1: Direct Upload

# Build the project
npm run build

# Deploy using Wrangler CLI
npm install -g wrangler
wrangler login
wrangler pages deploy dist

Option 2: Git Integration

Push code to GitHub/GitLab
Connect repository to Cloudflare Pages
Configure build settings:
- Framework: Astro
- Build Command: npm run build
- Output Directory: dist
- Node.js Version: 18 or 20
Deploy automatically on push

Other Platforms

Vercel

npm install -g vercel
vercel

Netlify

npm install -g netlify-cli
netlify deploy --prod

Environment Variables

No environment variables required! The app runs entirely in the browser.

🔑 SEO Keywords

This tool is optimized for the following keywords:

Core Keywords

json formatter
json validator
json parser
json viewer
json editor
json beautifier
json minify
json compare
json diff

Conversion Keywords

json to yaml
json to xml
json to csv
json to excel
json to html
json to pdf
json to table
json to dart
json to go
json to rust
json to python
json to c
json to typescript

Feature Keywords

json schema
json escape
json stringify
json pretty print
json format
json lint
json viewer online
json formatter online

Chinese Keywords (中文)

json格式化
json在线解析
json在线格式化
json 整形
json美化
json转yaml
json转表格

🎓 Use Cases

For Developers

✅ Debug API responses
✅ Generate TypeScript interfaces
✅ Convert config files
✅ Compare JSON differences
✅ Generate data models

For Data Analysts

✅ Convert JSON to CSV/Excel
✅ Visualize data as tables
✅ Extract specific fields
✅ Validate data structure

For QA Engineers

✅ Compare API responses
✅ Validate JSON schemas
✅ Format error messages
✅ Test data transformation

For Students/Learners

✅ Learn JSON structure
✅ Understand data formats
✅ Practice data conversion
✅ Study code generation

🌟 Key Features Summary

Feature	Description	Status
Smart Input	Auto-detects 15+ formats	✅
JSON Validation	Real-time error checking	✅
Format Conversions	10+ output formats	✅
Code Generation	7 programming languages	✅
JSON Compare	Visual diff tool	✅
Field Extraction	JavaScript expressions	✅
Table View	HTML table generation	✅
History	Local storage	✅
Mobile Support	Responsive design	✅
Bilingual	English + Chinese	✅
Privacy	100% client-side	✅
Offline	Works without internet	✅

🤝 Contributing

Contributions are welcome! Please feel free to submit issues or pull requests.

Development Setup

# Fork the repository
# Clone your fork
git clone https://github.com/YOUR-USERNAME/neo-dev-toolkit.git

# Create a feature branch
git checkout -b feature/amazing-feature

# Make your changes
# Commit your changes
git commit -m 'Add amazing feature'

# Push to branch
git push origin feature/amazing-feature

# Create a Pull Request

📊 Performance

⚡ Format Speed: < 100ms for 1MB JSON
📦 Bundle Size: < 500KB (gzipped)
🚀 Load Time: < 2s on 3G
💾 Memory Usage: < 100MB for 10MB JSON
🔄 Conversion Speed: < 500ms for most formats

🔒 Privacy & Security

✅ No Server Uploads: All processing in browser
✅ No Analytics: No tracking code
✅ No Cookies: No user tracking
✅ HTTPS: Secure connection
✅ Open Source: Fully auditable code
✅ Local Storage: History stays on your device

📝 License

MIT License - see LICENSE file for details

🙏 Acknowledgments

Astro - Amazing web framework
Monaco Editor - Powerful code editor
Cloudflare - Hosting & CDN

📞 Support

📧 Email: [email protected]
🐛 Issues: GitHub Issues
💬 Discussions: GitHub Discussions
📖 Documentation: Full Docs

Made with ❤️ by the JSON Tools Team

⭐ Star us on GitHub — it helps!

🔗 Live Demo • 📖 Docs • 🐛 Issues

Name		Name	Last commit message	Last commit date
Latest commit History 387 Commits
docs		docs
public		public
src		src
.gitignore		.gitignore
README.LOCALES.md		README.LOCALES.md
README.ar.md		README.ar.md
README.de.md		README.de.md
README.es.md		README.es.md
README.fr.md		README.fr.md
README.ja.md		README.ja.md
README.ko.md		README.ko.md
README.md		README.md
README.pt.md		README.pt.md
README.ru.md		README.ru.md
README.zh.md		README.zh.md
astro.config.mjs		astro.config.mjs
deploy.sh		deploy.sh
package-lock.json		package-lock.json
package.json		package.json
wrangler.toml		wrangler.toml

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