22,000+ GitHub stars · 15+ language implementations · Growing fast
Cut Your LLM Token
Costs by 50%
Convert JSON to TOON format instantly.
Free in the browser, API access for developers.
50%
Fewer tokens
73.9%
LLM accuracy
15+
Language SDKs
22k+
GitHub stars
Paste JSON, get TOON
JSON
Input
TOON
Output
Paste TOON, get JSON
TOON
Input
JSON
Output
Validate TOON syntax
TOON
Input
Paste TOON on the left to validate
Compare token usage side by side
JSON (input)
Paste JSON on the left to compare token usage
Why TOON saves so many tokens
The same data, three different formats. TOON strips everything an LLM doesn't need.
JSON
~235 tokens
[
{
"id": 1,
"name": "Ada Lovelace",
"role": "admin",
"active": true
},
{
"id": 2,
"name": "Alan Turing",
"role": "user",
"active": false
},
{
"id": 3,
"name": "Grace Hopper",
"role": "user",
"active": true
}
]
TOON
~106 tokens
[3]{id,name,role,active}:
1,Ada Lovelace,admin,true
2,Alan Turing,user,false
3,Grace Hopper,user,true
Tabular arrays eliminate repeated keys entirely
Tabular arrays
Uniform object arrays become CSV rows. Keys declared once, not repeated per row.
Indentation = nesting
No braces, brackets, or commas for objects. Whitespace does the structural work.
Minimal quoting
Strings only quoted when necessary. No quotes around plain words, numbers, booleans.
Lossless round-trip
Every valid JSON can be encoded to TOON and decoded back exactly. No data loss.
Simple pricing
The browser tool is always free. Pay only when you need it in production.
Free
$0
forever
- JSON → TOON converter
- TOON → JSON decoder
- Syntax validator
- Token comparison tool
- Runs entirely in your browser
- No signup required
Most popular
API Access
$9
/ month
- Everything in Free
- REST API endpoint
- Batch conversion support
- High-throughput requests
- Use in pipelines & automations
- Priority support
TOON format is open source under MIT license. This tool is built on top of the official
toon-format/toon spec.