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YAML ↔ JSON Converter

Convert YAML to JSON or JSON to YAML. Handles nested structures, arrays, and common YAML syntax.

Your data stays in your browser — nothing is uploaded to any server.

or try sample data

What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files (Docker Compose, Kubernetes, CI/CD pipelines, Ansible). It uses indentation to represent hierarchy, making it more readable than JSON for configuration but requiring a parser to convert to machine-readable formats.

  • YAML → JSON — parse YAML and output formatted JSON.
  • JSON → YAML — convert JSON objects to clean YAML syntax.
  • Nested structures — handles objects, arrays, and deeply nested data.
  • Common YAML features — supports comments, quoted strings, booleans, numbers, null, and block scalars (| and >).
  • Swap — move output back to input for round-trip conversions.
  • Limitations — does not support YAML anchors (&), aliases (*), custom tags, or merge keys (<<). For those, use a full YAML library.

Frequently Asked Questions

How do I convert YAML to JSON online?

Paste your YAML content into the input panel and click Convert to JSON. The tool parses the YAML structure and produces properly formatted JSON output. You can also convert in the reverse direction — paste JSON and click Convert to YAML.

What is the difference between YAML and JSON?

JSON uses braces, brackets, and quotes with a strict syntax. YAML uses indentation and minimal punctuation, making it more human-readable. JSON is better for APIs and data exchange due to its strict parsing rules. YAML is preferred for configuration files (Kubernetes, Docker Compose, CI/CD pipelines) because it's easier to read and write by hand.

Is my data safe when converting YAML and JSON here?

Yes. All parsing and conversion happens entirely in your browser. Your configuration files, which may contain secrets or sensitive settings, are never sent to any server.

Can I use this for Kubernetes and Docker Compose files?

Yes. This tool handles the YAML structures commonly used in Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and other DevOps configuration files. Convert between YAML and JSON to use whichever format your tools require.

Does this tool validate YAML syntax?

Yes. If your YAML has syntax errors — incorrect indentation, invalid characters, or structural problems — the tool displays an error message indicating what went wrong and where. This makes it useful as a YAML linter in addition to a converter.

Does this tool preserve YAML comments?

No. JSON does not support comments, so any YAML comments are lost when converting to JSON. If you convert JSON back to YAML, the original comments will not be restored. This is a fundamental limitation of the JSON format, not the tool.