YAML ↔ JSON Converter

What is the difference between YAML and JSON?

Both YAML and JSON are data serialization formats. JSON uses curly braces and quotes — it's strict and machine-friendly. YAML uses indentation instead of brackets — it's more human-readable and supports comments. YAML is popular for config files (Docker Compose, Kubernetes, GitHub Actions) while JSON is standard for APIs.

Can YAML represent everything JSON can?

Yes. YAML is a superset of JSON — any valid JSON is valid YAML 1.2. YAML additionally supports comments (#), multi-line strings, anchors (&) for reusing values, and richer type inference. However, YAML's indentation-sensitive syntax makes it trickier for machines to parse reliably.

What are YAML anchors and how do they work?

YAML anchors (&name) define a reusable block and aliases (*name) reference it. Example: defaults: &defaults timeout: 30. Then another block can use <<: *defaults to merge those values. When converting to JSON, anchors are resolved and values are expanded inline.

Why do I get YAML conversion errors?

Common YAML errors: mixed tabs and spaces (YAML requires spaces only), missing colons after keys, incorrect indentation, unquoted special characters like : or # inside values. Use consistent 2-space indentation and quote strings that contain colons, hashes, or leading/trailing spaces.

When should I use YAML instead of JSON for configuration?

Use YAML when humans write or read the config frequently — its cleaner syntax reduces eye strain. YAML shines in CI/CD pipelines (GitHub Actions, GitLab CI), infrastructure tools (Kubernetes, Helm, Ansible), and app config files. Use JSON for APIs and situations where strict parsing is critical.

How do I convert a Kubernetes YAML manifest to JSON?

Paste the Kubernetes manifest YAML into the input area with YAML → JSON mode selected. The output is valid JSON with the same structure. YAML comments are lost in conversion. Alternatively: kubectl get deployment my-app -o json returns the live JSON from your cluster directly.