Online YAML Viewer, Tree Inspector & YAML to JSON Converter
Explore YAML Trees & Convert YAML to JSON Online. Browse complex YAML documents with an expandable interactive tree view, syntax validator, and bidirectional YAML ⇄ JSON converter.
What is YAML Viewer and what does it do?
The YAML & Frontmatter Studio is a developer tool for exploring, validating, and converting YAML (.yaml, .yml) configuration files.
Inspect Kubernetes manifests, Docker Compose configurations, CI/CD pipelines, and markdown frontmatter with an interactive expandable tree view and bidirectional JSON converter.
- Explore nested YAML hierarchies with collapsible tree navigation.
- Validate YAML syntax with real-time error indicator and line numbers.
- Instant bidirectional conversion between YAML and formatted JSON.
- Built-in Docker Compose and Kubernetes deployment templates.
How does YAML Viewer work?
Uses a WebAssembly-compatible YAML parser to safely parse text into structured JavaScript objects, rendering interactive tree nodes with type badges (Array, Object, String, Number).
100% private: all processing happens locally in your browser using client-side WebAssembly, WebCrypto, WebAudio, and HTML5 Canvas. Your files are never uploaded to any server.
Who needs YAML Viewer?
Cloud & DevOps Engineers
Debug Kubernetes, Helm, and GitHub Actions workflow syntax without command line tools.
Web Developers
Validate Static Site Generator (Hugo, Jekyll, Astro) markdown frontmatter blocks.
Supported file formats
YAML & Frontmatter Studio opens and processes the following file extensions directly in your browser:
.yaml.ymlHow to use YAML Viewer — step by step
- 1
Upload or Paste YAML
Open your .yaml file or paste configuration markup.
- 2
Browse Tree Structure
Expand and collapse objects, arrays, and primitive fields.
- 3
Convert to JSON
Switch to the JSON tab to copy formatted JSON data instantly.
Frequently asked questions
Does it validate Kubernetes and Docker Compose YAML?
Yes, syntax errors and indentation mismatches are detected with line indicators.
Can I convert JSON back to YAML?
Yes, bidirectional conversion is supported with clean 2-space indentation.
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