JSON Tools - Format, Convert to ISON (Save 70% Tokens), CSV & More
How to Use
Learn how to format, validate, and convert JSON in seconds
Paste Your Data
Start by pasting your JSON, URL parameters, XML, or YAML data into the left input area
{ "name": "John", "age": 30 } Auto Format & Validate
Your data is automatically formatted and validated. Errors are highlighted for easy fixing
Convert & Export
Use the buttons to convert to CSV, Excel, XML, YAML, TypeScript, and more
JSON → CSV | Excel | XML | YAML Click any conversion button to instantly transform your JSON
Compare JSON Files
Use the JSON Compare tool to see differences between two JSON files side-by-side
Diff View: Green = Added, Red = Removed, Yellow = ChangedPerfect for tracking API response changes
Extract Fields
Use JavaScript functions to extract specific fields from complex JSON
- Action: Enter extraction function
- Example: obj => obj.users
- Result: Extracts users array
- Pro Tip: Chain extractions
- Use: obj => obj.data.items[0]
100% Secure & Private
All processing happens in your browser. No data ever sent to servers
Powerful Features
Everything you need for JSON processing in one place
JSON Formatter & Validator
Format and validate JSON with syntax highlighting, error detection & auto-formatting. Best JSON formatter online
JSON to CSV, Excel, XML, YAML, ISON, TOON
Convert JSON to CSV, Excel, XML, YAML, ISON, TOON & TypeScript. Save up to 70% tokens with ISON format. Also support CSV to JSON, Excel to JSON conversion
JSON Compare & Diff Tool
Compare two JSON files, highlight differences with JSON diff checker. Online JSON comparison tool
JSON Minify & Beautifier
Minify JSON for production, beautify JSON for reading. JSON escape, unescape & string manipulation
JSON Parser & Converter
Parse URL parameters, XML, YAML to JSON. Extract fields, generate TypeScript interfaces & schemas
Secure JSON Viewer Online
100% browser-based JSON viewer. No data uploaded. Secure, private & offline-capable JSON tools
🚀 New: Save 70% Tokens with ISON & TOON
Optimized formats for LLM applications and efficient data storage
JSON to ISON
Save up to 70% tokens with LLM-optimized table format. Perfect for AI applications and RAG systems.
- ✓ Type-safe annotations
- ✓ 61% average token savings
- ✓ Table-based structure
- ✓ Bidirectional conversion
JSON to TOON
Simple key=value format for configuration files and structured data. 52% more efficient than JSON.
- ✓ Highly readable
- ✓ Configuration-optimized
- ✓ Simple syntax
- ✓ Lossless conversion
Supported JSON Conversion Features
All-in-one JSON toolkit to meet all your JSON processing needs
📊 JSON Formatting
- JSON Formatter
- JSON Beautifier
- JSON Minify
- JSON Validator
- JSON Escape
- JSON Viewer
🔄 JSON Conversion
- JSON to CSV
- JSON to Excel
- JSON to XML
- JSON to YAML
- JSON to TypeScript
- JSON to Table
- JSON to ISON (70% token saving)
- JSON to TOON
➡️ Convert to JSON
- CSV to JSON
- Excel to JSON
- XML to JSON
- YAML to JSON
- URL Params to JSON
- String to JSON
🔧 JSON Tools
- JSON Compare / JSON Diff
- Compare JSON Online
- Field Extraction
- JSON Path Finder
- JSON History
- Remove Comments
💻 Developer Tools
- TypeScript Interface
- JSON Schema Generator
- JSON Code Examples
- JSON Syntax Highlighting
- JSON Error Check
- JSON Line Numbers
🔒 Security Features
- 100% Browser-based
- Local Processing
- No Server Upload
- Works Offline
- Privacy First
- Secure Processing
💡 Note: All JSON processing is done locally in your browser. Supports large JSON files with syntax highlighting, error hints, smart folding, and more. Suitable for developers, data analysts, API testing, and more.
Is my JSON data secure & private?
Common questions about our JSON tools
Is my JSON data secure & private?
Yes! All JSON processing happens locally in your browser. No JSON data uploaded to servers. 100% secure JSON tools.
What JSON formats can I convert?
JSON converter supports: JSON to CSV, JSON to Excel, JSON to XML, JSON to YAML, JSON to TypeScript. Also CSV to JSON, Excel to JSON, XML to JSON, YAML to JSON, URL params to JSON
How do I compare two JSON files?
Use JSON compare tool to see differences. JSON diff checker highlights additions (green), deletions (red), and changes (yellow). Compare JSON online instantly
Can I extract fields from JSON?
Yes! JSON parser supports field extraction. Use JavaScript functions like 'obj => obj.name' to extract specific data. Perfect for JSON API responses
Is this JSON formatter free?
Yes! All JSON tools are 100% free: JSON formatter, validator, minifier, beautifier, converter, compare tool. No limitations
Can I use JSON tools offline?
Yes! JSON viewer works offline after loading. No internet needed. JSON formatter, validator, converter all work browser-based
What are ISON and TOON formats?
ISON (Interchange Simple Object Notation) is a compact structured format optimized for LLMs, focusing on reducing token consumption; TOON is a key=value structured format more geared towards configuration file scenarios. Both can be converted to and from JSON.
How to use ISON / TOON conversion feature?
After pasting JSON into the input area, click the "JSON to ISON" or "JSON to TOON" button to generate results and copy to clipboard with one click.
Does ISON really save 70% of tokens?
In data with many repeated key names and deeper structures, ISON usually significantly reduces tokens. The actual savings ratio depends on the data structure, common range is 40%~70%.
Can converted data be converted back to JSON?
Yes. One of the design goals of this tool is to maintain structure reversibility, making it easy to switch between compressed representations and standard JSON.
When is ISON more suitable to use?
When you want to feed large amounts of structured data to LLMs (such as RAG, Agent contexts, log analysis), ISON is preferred, which can effectively reduce context overhead.
When is TOON more suitable to use?
When you care more about readability and configuration maintenance efficiency (such as application configuration, deployment parameters, environment variable management), TOON is often more intuitive than JSON.