Package com.cedarsoftware.io

Class ToonWriter

java.lang.Object
com.cedarsoftware.io.ToonWriter
All Implemented Interfaces:
Closeable, Flushable, AutoCloseable
public class ToonWriter extends Object implements Closeable, Flushable
Output a Java object graph in TOON (Token-Oriented Object Notation) format.

TOON is a compact, human-readable format optimized for LLM token efficiency, using approximately 40-50% fewer tokens than equivalent JSON.

Key TOON characteristics:

  • Indentation-based structure (no braces/brackets)
  • Tabular arrays with CSV-like rows: items[2]{id,name}: 1,Alice 2,Bob
  • Minimal quoting (only when necessary)
  • Key: value syntax for objects

Example TOON output: 

 name: John
 age: 30
 address:
   city: NYC
   zip: 10001
 tags[3]: java,json,toon
Author:
John DeRegnaucourt (jdereg@gmail.com)
Copyright (c) Cedar Software LLC

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

License

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

  • Constructor Details

    • ToonWriter

      public ToonWriter(OutputStream out, WriteOptions writeOptions)
      Create a ToonWriter that writes to an OutputStream.
      Parameters:
      out - OutputStream to write TOON content to
      writeOptions - configuration options (may be null for defaults)

  • Method Details