YAML ↔ JSON Converter

What is YAML ↔ JSON Converter?

YAML-JSON Converter transforms data between YAML and JSON formats with full support for YAML-specific features like anchors, aliases, multi-line strings, and complex key types. It validates syntax in both directions and preserves data types including strings, numbers, booleans, nulls, arrays, and nested objects. The converter handles YAML multi-document streams and provides clear error messages for syntax violations.

DevOps engineers working with Kubernetes and Docker configurations, backend developers converting between config formats, and data engineers transforming pipeline definitions. The tool runs entirely in your browser — your data never leaves your device.

How to Use YAML ↔ JSON Converter

1. Paste your YAML content in the left panel or JSON in the right panel
2. Click the conversion arrow to transform in either direction
3. Review validation errors if the input contains syntax problems
4. Adjust indentation settings for the output format
5. Copy the converted result to clipboard or download as a file

Common Use Cases

• Converting Kubernetes YAML manifests to JSON for programmatic manipulation with jq
• Translating Docker Compose YAML to JSON for import into infrastructure-as-code tools
• Converting JSON API responses to YAML for more readable configuration templates
• Migrating GitHub Actions YAML workflows to JSON when tooling requires it
• Converting YAML-based CI/CD configs (GitLab CI, CircleCI) to JSON for schema validation

Pro Tips

• YAML treats unquoted yes, no, on, off as booleans — if you need the string 'yes', always quote it to avoid silent type conversion when round-tripping through JSON
• YAML anchors (&name) and aliases (*name) have no JSON equivalent — the converter expands them inline, which can significantly increase the output size for heavily aliased documents
• Use the YAML block scalar syntax (| for literal, > for folded) for multi-line strings — it is far more readable than JSON's escaped newline characters

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: YAML 1.2, JSON5, TOML, Kubernetes manifest.

Frequently Asked Questions