Validate YAML documents, detect duplicate keys and format with comment-aware tooling while checking that parsed values and aliases remain intact.
LOCAL INPUT
Valid YAML · 1 document(s)
COMPUTED OUTPUT
TRANSFORM & CHECK
YAML syntax and duplicate keys are checked with js-yaml. Formatting uses installed comment-aware Prettier tooling, then verifies parsed document values, alias relationships and document count. Comments/quotes may be restyled; unsupported tags or unsafe formatting are reported, not silently discarded. Up to 20 documents, 64 parser nesting levels and 10,000 parser nodes.
Inputs are bounded to 200,000 UTF-8 bytes. JSON values use JavaScript numeric precision; nonfinite values and unsafe integers are rejected, and exact large numbers should be strings. JSON nesting is limited to 64 levels and 10,000 values. Output is bounded to 1 MB. Files are decoded locally as UTF-8. Nothing is uploaded to a calculation service; clipboard and downloads require an explicit action.
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
Paste or import supported UTF-8 documents, review live validation, run the named action, then inspect and export the computed output.
The installed standards-aware js-yaml parser checks every document with duplicate keys disallowed. Parser errors include line and column details where available. The tool does not attempt to validate YAML using a handwritten indentation regex.
Documents are processed locally in browser memory, without an external calculation-processing API or server upload. File import, clipboard and download happen only through explicit actions. Ordinary website requests may still be logged; no persistent document profile is created.
The installed standards-aware js-yaml parser checks every document with duplicate keys disallowed. Parser errors include line and column details where available. The tool does not attempt to validate YAML using a handwritten indentation regex.
Comment-aware Prettier tooling formats the source with two or four spaces. Before returning output, parsed values, alias relationships and document count are compared with the original. Unsafe or unsupported transformations are reported with the original input retained.
All documents are validated and formatted explicitly, up to twenty documents. Their count appears in the status and outline; a transformation that changes document count is rejected instead of silently discarding a document.
They are supported where the installed parsers can preserve their semantics. Formatting checks alias relationships and parsed multiline values. Unknown tags or unsupported syntax receive an error rather than being silently converted to another value.
Source is bounded to 200,000 UTF-8 bytes, sixty-four parser nesting levels, ten thousand parser nodes and bounded merge work. Formatting has a separate output budget; large documents should be split into smaller files.
No. UTF-8 files are read and processed locally in browser memory. Copy and download are explicit actions. Ordinary website page requests may still be logged; the tool does not save a configuration profile.