JSON ↔ YAML Converter
Convert JSON and a supported YAML 1.2 subset locally. Preserve large numeric tokens and quoted IDs; copy or download the result.
Up to 128 KiB UTF-8 input. One document; string keys only. Directives, anchors, aliases, merge keys and unsupported tags are rejected. Comments and original formatting are not preserved.
Large numbers remain exact text in the output. Other apps may round them when reading JSON; quote identifiers when they should be strings.
Your text is processed on this device. It is not uploaded or saved by this tool.
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About this tool
Convert one JSON or supported YAML document on your device. Large numbers stay exact text in the output and quoted IDs remain strings. Input is limited to 128 KiB UTF-8. Duplicate keys, anchors, aliases and unsupported structures are rejected. Comments and original formatting are not preserved; downstream apps may round JSON numbers.
How to use
- Choose JSON → YAML or YAML → JSON and paste one document, or load the example.
- Convert, review the result, then copy or download it. Editing or clearing cancels work and removes stale output.
Example
JSON {"code":"00123","id":9007199254740993} keeps code as text and the full numeric token in YAML. Other apps may round that number when reading JSON.
Frequently asked questions
Does this support every YAML feature?
No. Input is limited to 128 KiB UTF-8 and one supported YAML 1.2 document with string keys. Duplicate keys, directives, anchors, aliases, merge keys and unsupported tags are rejected. Comments and formatting are not preserved.
Do I need an account?
No. This free tool can be used without creating an account.
Where is my input processed?
This tool processes its input in your browser. Tool input is not uploaded for processing. General site usage statistics are separate; see the privacy policy.