JSON to YAML Converter
Paste a JSON sample to instantly convert it into valid, properly indented YAML. Free online developer tool.
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YAML Document
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Free JSON to YAML Converter
Paste a JSON sample to instantly convert it into valid, properly indented YAML. Nested objects become indented key blocks, arrays become - item lists, and values are quoted only when needed so the output stays as readable as hand-written YAML.
How to Use It
Paste any JSON object or array into the input box, or click "Load Example" to see a sample run. The converter walks your JSON's actual values (not inferred types) and emits standard two-space-indented YAML, quoting strings only when they'd otherwise be ambiguous (for example, a string that looks like a number, a boolean, or contains YAML special characters).
Example
Given {"name": "Ann", "tags": ["a","b"], "address": {"city": "NYC", "zip": null}}, the tool emits name: Ann, a tags: key followed by - a and- b on their own indented lines, and an address: block containingcity: NYC and zip: null.
Common Use Cases
- Converting a JSON API response into a YAML fixture for tests.
- Turning a JSON config export into a YAML config file for Docker Compose, Kubernetes, or CI.
- Making a deeply nested JSON payload easier to read by reformatting it as YAML.
- Producing a starting YAML document from real sample data instead of writing it by hand.
FAQs
Why does this tool output values instead of type declarations?
Like TOML, YAML is a data-serialization format rather than a type/schema language, so this converter emits a real YAML document populated with your sample's actual values rather than type names.
When does the converter quote a string value?
A string is quoted whenever leaving it bare would change its meaning in YAML — for example if it's empty, looks like a number or boolean, has leading/trailing whitespace, or contains a YAML special character like :, #, or -. Ordinary strings are left unquoted.
Is my JSON uploaded anywhere?
No — parsing and YAML generation happen entirely client-side in your browser. Nothing you paste is sent to a server.