How to use the TOON to CSV
- Paste your TOON into the input box, or open a file.
- The output updates automatically as you type.
- Copy the CSV 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 CSV
CSV (comma-separated values) is the universal format for spreadsheets and data exports. The first row holds column names and each following row is one record.
How it works
Nested objects are flattened into dot-separated column names (for example address.city) and arrays are written as JSON inside a cell. If your TOON wraps a list in an object, the list is used as the rows.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This TOON to CSV 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 CSV free?
Yes. This TOON to CSV 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 CSV runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Does the TOON to CSV conversion lose data?
Nested objects are flattened into dot-separated column names (for example address.city) and arrays are written as JSON inside a cell. If your TOON wraps a list in an object, the list is used as the rows.
Can I use the TOON to CSV offline?
Yes. TOON to CSV 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.
