What is YAML ↔ JSON conversion?
YAML and JSON are two human-readable data formats. JSON is strict and noisy; YAML is forgiving and quiet. Most modern config tools (Kubernetes manifests, GitHub Actions, OpenAPI specs, Helm charts) ship YAML, while APIs and JavaScript prefer JSON. Converting between the two is one of the most common chores in a developer's day.
What this tool does
- Auto-detect direction — type into either side and watch the other side update.
- Indent choice — pick 2 spaces, 4 spaces, or a tab for JSON.
- YAML flow level — control how nested structures are rendered (block vs flow style).
- Inline validation — clear error messages with line and column for parse failures.
Tips
- YAML allows comments (
#); converting to JSON discards them because JSON does not. - Multi-document YAML (separated by
---) is handled — the result is a JSON array. - Anchors and aliases are dereferenced during conversion.
Conversion runs locally — your manifests and secrets never leave your browser.