YAML ⇔ JSON Converter

Convert between YAML and JSON. Ideal for converting configuration file formats and editing Kubernetes manifests, Docker Compose, GitHub Actions, and OpenAPI specs.

✅ 100% free, no signup, runs entirely in your browser (powered by js-yaml)

YAML

JSON

Auto-convert

Supported Formats

YAML 1.2 compliant (uses the js-yaml library)
JSON output is formatted and validated
Multi-document（--- separated): only the first document is converted
YAML anchors（& / *） are also supported

If something is broken or not displaying correctly, let us know via the contact form.

📖 How to Use

1

Paste input

Paste YAML or JSON on the left; the right side updates automatically.
2

Toggle direction

Switch YAML → JSON or JSON → YAML. Tab/space and indent width configurable.
3

Check validation errors

Syntax errors show line and reason — great for K8s manifests and GitHub Actions.

❓ FAQ

Are YAML anchors (&) and aliases (*) supported?

Yes, via js-yaml. Anchors, aliases, and tags are parsed. They get expanded when converted to JSON.

Are multi-document YAML (---) files handled?

Multi-doc YAML becomes a JSON array — works with multi-resource Kubernetes manifests.

Works with Docker Compose / K8s manifests?

Yes. Converts losslessly for CI pipelines that post to APIs as JSON.

Is the YAML Norway bug handled?

We use YAML 1.2, so NO/Yes stay strings — no Norway bug.