TOON Validator and Formatter
Validate TOON 4.1 strictly, inspect line-aware decoding errors, preview JSON structure, and format valid documents through canonical re-encoding.
Validate TOON structure strictly and format only valid documents
TOON validation checks syntax and structural rules such as indentation, headers, declared array counts, row widths, escapes, duplicate keys, and trailing root content.
Formatting is performed only after a strict successful decode. ArrayText then re-encodes the decoded JSON value into canonical TOON output without silently repairing invalid source text.
TOON Validator and Formatter FAQ
What version does this validator support?
It uses official package 4.1.1 for TOON Working Draft specification 4.1.
Does validation check my application schema?
No. It validates TOON syntax and structure, not JSON Schema, business rules, or required application fields.
Can the formatter fix invalid TOON?
No. Invalid documents receive diagnostics. Canonical formatting becomes available only after strict decoding succeeds.
Continue working with your data
Convert JSON to TOON specification 4.1 and TOON back to JSON using the official codec, strict decoding, round-trip checks, and size comparisons.
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