Next JSON

The Next JSON Toolbox

JSON to TOON Converter

Convert JSON to TOON format - a token-efficient notation designed for LLM applications

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JSON Tools

Nested JSON Parser and Viewer

Decode and view multiple level JSON strings with ease

Convert JSON To Oneline

Convert any JSON string to one line without spaces or indentation

JSON Schema Generator

Generate a JSON schema from a JSON string

JSON Schema to JSON

Convert a JSON schema to a JSON string

JSON Diff & Compare

Compare two JSON objects and highlight the differences

TOON to JSON Converter

Convert TOON format back to standard JSON

Array Tools

List to Array Converter

Convert input string to an array with different quote styles

How It Works

See how TOON format reduces token count while maintaining data structure. Perfect for LLM applications where every token matters!

Simple Object Conversion

Convert a basic JSON object to TOON format with clean key-value pairs.

Input
{
  "name": "Luna",
  "level": 42,
  "active": true,
  "guild": null
}
Output
name: Luna
level: 42
active: true
guild: null

Nested Objects

TOON uses indentation instead of braces for nested structures, making it more readable.

Input
{
  "player": {
    "name": "Shadow Knight",
    "stats": {
      "health": 100,
      "mana": 50
    }
  }
}
Output
player:
  name: Shadow Knight
  stats:
    health: 100
    mana: 50

Arrays of Primitives

Primitive arrays are displayed inline with explicit length declaration [N].

Input
{
  "inventory": ["sword", "shield", "potion", "map"],
  "scores": [100, 95, 88, 72]
}
Output
inventory[4]: sword,shield,potion,map
scores[4]: 100,95,88,72

Tabular Arrays

Arrays of objects with same fields use efficient tabular format {field1,field2}.

Input
{
  "heroes": [
    {"name": "Ada", "class": "mage", "level": 30},
    {"name": "Bob", "class": "warrior", "level": 25},
    {"name": "Cat", "class": "rogue", "level": 28}
  ]
}
Output
heroes[3]{name,class,level}:
  Ada,mage,30
  Bob,warrior,25
  Cat,rogue,28

Frequently Asked Questions

What is TOON format?

TOON (Token-Oriented Object Notation) is a compact format designed for LLM applications. It reduces token count by ~50% compared to JSON while maintaining lossless conversion.

Why use TOON instead of JSON?

When sending data to LLMs, every token costs money and context space. TOON cuts token count significantly, so you can fit more data in prompts or reduce API costs.

Is the conversion lossless?

Yes! TOON preserves all your data. You can convert JSON to TOON and back to JSON without losing any information.

Can I convert TOON back to JSON?

Absolutely! Use our TOON to JSON converter tool to transform TOON format back into standard JSON whenever you need it.

Does this site store my data in the cloud?

No, this site does not store or share your data in the cloud. Your data remains private and is kept locally on your broswer.

This site lacks some useful features that I need. Can you add them?

Yes, we welcome all suggestions! Please feel free to share your feedback using the link at the bottom of the page.