JSON to YAML Converter
Convert JSON to YAML in your browser. Every valid JSON document is valid YAML, so this direction is lossless.
Last reviewed by the Radiatus Cloud team
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This direction is always clean
YAML is a strict superset of JSON, so every valid JSON document is already valid YAML and the conversion cannot lose anything. What it does is reformat: braces and brackets become indentation, quotes disappear where they are not required, and the result becomes far easier for a human to read and edit. That readability is the entire reason to convert.
Quoting still matters in the output
YAML infers types from unquoted scalars, so a string that looks like something else changes meaning once the quotes are dropped. The country code NO becomes the boolean false, the version 1.10 becomes the number 1.1, and 12:30 can be read as a sexagesimal number by older parsers. A careful converter keeps quotes on any scalar whose type would otherwise shift, which is why some strings in the output stay quoted while others do not.
Indentation rules
YAML forbids tabs entirely because tab width is ambiguous, and uses two spaces per level by convention. Nested sequences inside mappings can be written with the dash at the parent indent level or one level in; both are valid and mixing them within a file is the usual cause of a confusing parse error.
Multi-line strings become readable
A JSON string containing escaped newlines is unreadable. In YAML it can use the literal block style with a pipe, which preserves newlines exactly, or the folded style with a greater-than sign, which joins lines into a paragraph. For an embedded script or a long description this is the single biggest readability gain of the conversion.
Comments are the reason to switch
JSON has no comment syntax, which is its main weakness as a configuration format. Converting to YAML lets you annotate the file with the reasoning behind each setting. That is usually why teams move configuration to YAML in the first place, and it is why converting back to JSON later is lossy.
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Frequently Asked Questions
Is JSON to YAML lossless?
Yes. YAML is a strict superset of JSON, so every valid JSON document is already valid YAML. The conversion only reformats; nothing can be lost in this direction.
Why are some strings still quoted in the output?
Because unquoted YAML scalars are type-inferred. Dropping quotes would turn NO into false, 1.10 into 1.1 and 12:30 into a number in older parsers, so quotes stay on any value whose type would shift.
Can I use tabs in the YAML output?
No. YAML forbids tabs for indentation because tab width is ambiguous. Two spaces per level is the convention, and mixing indentation styles causes confusing parse errors.
What happens to long strings with newlines?
They can use the literal block style with a pipe, preserving newlines exactly, or the folded style with a greater-than sign. For embedded scripts this is the biggest readability gain of converting.
Why convert configuration to YAML at all?
Comments. JSON has no comment syntax, so configuration cannot be annotated. That is usually the reason teams move to YAML, and it is why converting back later loses information.
Privacy & Security
Converted locally.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.