How to use the YAML to TOON
- Paste your YAML into the input box, or open a file.
- The output updates automatically as you type.
- Copy the TOON or download it as a file.
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.
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 YAML to TOON 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 YAML to TOON free?
Yes. This YAML to TOON 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 YAML to TOON runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does the YAML to TOON conversion lose data?
The structure and values of your YAML are preserved. Formatting details such as comments are not carried over.
Can I use the YAML to TOON offline?
Yes. YAML to TOON 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.
