How to use the TOON Viewer
- Paste your TOON or open a file.
- The view updates automatically.
- Expand and collapse nodes to explore the structure.
About TOON
TOON (Token-Oriented Object Notation) is a compact encoding of JSON designed for LLM prompts. It uses YAML-style nesting and CSV-style rows for uniform arrays, typically cutting token counts substantially compared with JSON.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This TOON Viewer processes everything locally in your browser tab. There is no server round-trip, no logging and no storage of your input.
Frequently asked questions
Is this TOON Viewer free?
Yes. This TOON Viewer is completely free to use with no sign-up, no limits and no ads inside the tool.
Is my data uploaded to a server?
No. The TOON Viewer runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Can I use the TOON Viewer offline?
Yes. TOON Viewer is also built into DevT Pro, a native app for Mac, Windows, iPad and Linux with 120+ developer tools that work fully offline. It is a $5.99 one-time purchase with no subscription.
