JSON to TOON Converter - Reduce LLM API costs
Convert JSON to TOON serialization format and reduce LLM tokens by 30-60%. Lower GPT token costs and Claude API costs with our free converter.
Official Language Implementations
TOON is available in 4 stable languages. Choose your preferred language and see how to integrate TOON into your projects.
Installation
View Repositorynpm install @toon-format/toonUsage Example
Key Features
- 30-60% token reduction
- Full spec compliance
- Browser & Node.js support
- TypeScript types included
JSON vs TOON: Which Format is Better for LLMs?
See the difference between JSON and TOON serialization format. TOON format reduces LLM tokens while maintaining perfect data clarity.
Traditional JSONStandard
156 tokens
{
"users": [
{
"id": 1,
"name": "Alice Johnson",
"email": "alice@example.com",
"role": "admin"
},
{
"id": 2,
"name": "Bob Smith",
"email": "bob@example.com",
"role": "user"
},
{
"id": 3,
"name": "Carol Davis",
"email": "carol@example.com",
"role": "user"
}
]
}TOON FormatOptimized
68 tokens56% smaller
users[3]:
id: 1, 2, 3
name: Alice Johnson, Bob Smith, Carol Davis
email: alice@example.com, bob@example.com, carol@example.com
role: admin, user, userTOON vs JSON: Detailed Comparison
| Feature | JSON Format | TOON Format |
|---|---|---|
| Token Efficiency | High redundancy | 30-60% reduction |
| Human Readability | Good | Excellent |
| API Cost Savings | Standard costs | Significant savings |
| LLM Compatibility | Universal | GPT, Claude, Gemini |
| Repeated Keys | Every object | Only once |
| Array Syntax | Verbose brackets | Compact tabular |
How to Use JSON to TOON Converter?
Paste Your JSON Data
Simply copy your JSON and paste it into the input area. Our converter supports all standard JSON formats. Not sure what to try? Click "Load Example" to see a ready-made JSON-to-TOON conversion in action.
Customize TOON Output
Tailor the TOON format to your needs. Select your preferred delimiter (comma, tab, or pipe), adjust indentation size, and toggle length markers to optimize readability and efficiency.
Instantly Convert to TOON
As you type or paste your JSON, watch it transform into TOON format in real time. The converter provides a clean, human-readable TOON output optimized for LLM prompts and data serialization.
Copy or Download Your TOON Data
Once converted, click "Copy" to save it to your clipboard or hit "Download" to export the TOON file. Conversion is fast, accurate, and completely local, no data ever leaves your browser.
Why Convert JSON to TOON Serialization Format?
Reduce API costs and optimize GPT token usage with TOON format. Save money on LLM API costs, reduce LLM tokens by 30-60%, and streamline your AI workflows with the most efficient serialization format for ChatGPT, Claude, and Gemini.
Reduce LLM Tokens by 30-60%
TOON serialization format eliminates redundant JSON syntax like brackets, braces, and repeated keys — reducing LLM tokens by up to 60% based on official benchmarks. Perfect for GPT token optimization.
Reduce API Costs Significantly
Lower GPT token costs and Claude API costs with TOON format. Reduce API costs by 30-60% on average across GPT, Claude, Gemini, and other LLMs. See immediate cost savings on every API call.
Completely Free Forever
No account required, no credit card, no limits. Convert unlimited JSON to TOON anytime, anywhere — 100% free forever.
Your Data Never Leaves Your Device
All conversion happens locally in your browser. Zero data transmission, zero servers, zero tracking. Your JSON stays private, guaranteed.
Instant TOON Format Conversion
Convert JSON to TOON serialization format in under 100ms. Real-time processing with immediate token reduction results — perfect for optimizing GPT API calls and reducing LLM tokens instantly.
JSON ↔ TOON Bidirectional Conversion
Convert JSON to TOON format for LLM prompts to reduce API costs, then convert TOON back to JSON when needed. Lossless conversion preserves your data structure perfectly.
Latest from Our Blog
Learn about TOON serialization format, how to reduce LLM tokens, JSON vs TOON comparisons, GPT token optimization, and strategies to reduce API costs
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with TOON Format?
Join thousands of developers using TOON serialization format to reduce LLM tokens and lower GPT token costs. Convert JSON to TOON now — it's completely free.