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YAML ↔ JSON Converter

Convert YAML to JSON or JSON to YAML with clear validation errors.

Your input stays in this browser. No API calls or server uploads.

Conversion direction

Upload a YAML or JSON file

YAML input

How to use the yaml ↔ json converter

Choose a conversion direction, paste your document or upload a text file, and convert. Copy or download the output.

Supported features and limitations

Supports one YAML document using the YAML 1.2 core schema. Comments and formatting are not retained. Duplicate keys, unknown tags, complex mapping keys, excessive aliases and non-JSON values are rejected. Inputs are limited to 200,000 characters.

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