All Tools

YAML Formatter & Converter

Format, validate, and convert YAML — all in your browser with no server uploads. Switch between Format, YAML→JSON, and JSON→YAML tabs.

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Format YAML

Paste messy or inconsistently indented YAML and get it back with clean 2-space indentation. The formatter parses the YAML and re-serializes it, which also acts as a structural validator — errors are shown in red.

YAML to JSON

Convert YAML configuration files, API responses, or any YAML document to a formatted JSON object. Useful when a JSON-only tool requires the same data, or when debugging CI/CD pipelines that mix both formats.

JSON to YAML

Paste any valid JSON and get the equivalent YAML representation. Keys are preserved in order; strings that contain special characters are automatically quoted; arrays and objects are rendered with 2-space indentation.

Supported YAML features

  • Scalars — strings, integers, floats, booleans (true / false), and null
  • Quoted strings (single and double quotes)
  • Nested mappings (objects) via indentation
  • Block sequences (lists starting with - )
  • Inline sequences [a, b, c] and inline mappings {key: val}
  • Multi-line literal (|) and folded (>) block scalars
  • Comments are stripped during parse

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