How to use the TOON to YAML
- Paste your TOON into the input box, or open a file.
- The output updates automatically as you type.
- Copy the YAML or download it as a file.
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.
About YAML
YAML is an indentation-based format used for Kubernetes manifests, Docker Compose, GitHub Actions, OpenAPI specs and countless config files. It is a superset of JSON that favours readability.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This TOON to YAML 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 to YAML free?
Yes. This TOON to YAML 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 to YAML runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does the TOON to YAML conversion lose data?
The structure and values of your TOON are preserved. Formatting details such as comments are not carried over.
Can I use the TOON to YAML offline?
Yes. TOON to YAML 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.
