JSON ⇄ TOON Converter Baichdi Tools

Paste JSON or TOON on either side, convert instantly, and see approximate token savings for your AI prompts.
Hosted at json-toon.baichdi.com – a free utility by Shahzaib Anwar.
JSON → TOON optimized for LLM prompts
JSON Input
Paste your JSON here
Length 0 chars
≈ Tokens 0
Tip: For best TOON savings, use uniform arrays of objects (same keys in each row).
TOON Output
Compact, token-efficient format
Length 0 chars
≈ Tokens 0
Token counts are rough estimates (chars ÷ 4). Exact tokens depend on the model.
Built with ❤️ by Shahzaib Anwar Uses TOON format (MIT).

What is TOON, and why convert JSON to TOON?

TOON (Token-Oriented Object Notation) in simple words

TOON is a modern data format designed specifically for Large Language Models. It represents the same objects, arrays, and values you have in JSON, but with a much more compact, table-like syntax. Instead of repeating keys and punctuation over and over, TOON declares the structure once, then lists the data row by row.

For uniform data (for example, an array of products, users, or orders), TOON can often use 30–60% fewer tokens than JSON while remaining human-readable and easy for models to parse.

Why JSON is still everywhere

JSON (JavaScript Object Notation) is the universal language of APIs and web apps. It’s supported by every programming language, it’s easy to log, easy to debug, and perfect when machines talk to machines. The downside, especially in AI workloads, is that JSON is very verbose: every {}, [], " and repeated key adds extra tokens and extra cost in LLM prompts.

When TOON is the best choice

  • Sending large tables of structured data into an LLM prompt.
  • Streaming analytics, logs, or datasets to models with limited context windows.
  • Reducing prompt size and API cost while keeping the data lossless.
  • Keeping prompts readable for humans and models at the same time.

When you may prefer JSON

  • Deeply nested, irregular data structures or complex config files.
  • Standard REST/GraphQL APIs where JSON is the default contract.
  • Storage formats where ecosystem support matters more than token cost.

Think of TOON as a prompt-friendly view of your JSON. You can keep JSON in your code and databases, and only convert to TOON when talking to an LLM – exactly what this tool does.