Is my data sent to a server?

No. All YAML and JSON conversion and validation happen entirely in your browser. Your config files and data never leave your device.

How are YAML data types mapped to JSON?

YAML mappings become JSON objects, sequences become JSON arrays, and scalars become strings, numbers, booleans, or null. Quoted scalars are preserved as strings to avoid unintended type coercion.

Can I convert JSON back to YAML?

Yes. Use the "JSON to YAML" button to reverse the conversion, producing readable, properly indented YAML from any valid JSON input.

YAML to JSON Converter Online Free - Convert YAML and JSON

Convert YAML to JSON and JSON to YAML online. Validate syntax, catch errors, and transform config files instantly in your browser, no upload required.

Input (YAML or JSON)

key: value...

SampleYAML to JSONJSON to YAMLClear

JSON Output

Result

Copy Result

Result

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How to Convert YAML to JSON Online

Type or paste your YAML content into the left editor.

The tool automatically converts valid YAML to JSON in real-time.

Copy the JSON result or use the 'JSON to YAML' button to reverse.

Why Use This YAML to JSON and JSON to YAML Converter?

Bi-Directional

Convert YAML to JSON and JSON to YAML with a single click.

Real-Time Validation

Instantly detects syntax errors in your YAML or JSON input.

Syntax Highlighting

Easy-to-read editor with syntax highlighting for both formats.

YAML to JSON Converter FAQ

Is YAML a superset of JSON?

Yes, YAML 1.2 is a superset of JSON, meaning valid JSON is also valid YAML.

Can I convert large files?

Yes, the tool handles large files efficiently in your browser.

Paste YAML and this converter instantly outputs valid JSON, mapping YAML keys, nested mappings, sequences, and scalar types into equivalent JSON objects and arrays. It also reverses the process to turn JSON back into YAML. Conversion and validation run entirely in your browser, so your config files are never uploaded to a server.

How to Use the YAML to JSON Converter

1
Paste your YAML
Type or paste your YAML content into the left editor—indentation, mappings, and sequences are all supported.
2
Get JSON in real time
The tool validates syntax as you type and converts valid YAML into structured JSON automatically.
3
Reverse if needed
Click "JSON to YAML" to convert in the opposite direction, turning a JSON object back into clean YAML.
4
Copy the result
Use the Copy button to grab the converted output for your config files, API payloads, or pipelines.

References

YAML 1.2.2 Specification
The official YAML language specification defining syntax, data types, and parsing rules.
RFC 8259 — JSON
The IETF specification for the JSON data interchange format produced by this converter.

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Frequently Asked Questions

Is YAML a superset of JSON?: Yes, YAML 1.2 is a superset of JSON, meaning valid JSON is also valid YAML. That is why this converter can accept JSON input and reformat it as YAML, and vice versa.
Can I convert large files?: Yes. The tool handles large files efficiently because conversion runs locally in your browser, with no upload or file-size server limit to worry about.
Is my data sent to a server?: No. All YAML and JSON conversion and validation happen entirely in your browser. Your config files and data never leave your device.
How are YAML data types mapped to JSON?: YAML mappings become JSON objects, sequences become JSON arrays, and scalars become strings, numbers, booleans, or null. Quoted scalars are preserved as strings to avoid unintended type coercion.
Can I convert JSON back to YAML?: Yes. Use the "JSON to YAML" button to reverse the conversion, producing readable, properly indented YAML from any valid JSON input.