YAML Viewer & Formatter
Format, validate, and visualise YAML data in a clean structured view. Supports YAML 1.1 and 1.2, anchors, aliases, and multi-document streams. Perfect for Kubernetes configs, Docker Compose, GitHub Actions CI/CD pipelines, and any human-readable configuration format. All processing happens in-browser — zero data uploaded.
The parsed YAML will appear here
What is YAML?
YAML (YAML Ain't Markup Language) is a human-friendly data serialisation format. It uses indentation and whitespace to represent structure, making it far more readable than JSON or XML for configuration files. YAML is the default format for Kubernetes, Ansible, GitHub Actions, Helm charts, and most modern CI/CD tools.
YAML is a strict superset of JSON — every valid JSON document is also valid YAML, but YAML adds features like comments, anchors (&), and multiline strings.
YAML Syntax Rules
- Indentation defines structure (spaces only — tabs not allowed)
- Key-value pairs:
key: value - Lists start with a dash and space:
- item - Comments start with
# - Anchors (
&) and aliases (*) allow value reuse - Multiline: literal (
|) or folded (>) blocks
Tips & Tricks
- Use Format to auto-fix inconsistent indentation
- Collapse nested objects to focus on high-level structure
- Tab characters cause parse failures — spaces only
- Validate Kubernetes and Helm manifests before applying
- All processing is in-browser — zero data uploaded
Common YAML Use Cases
Kubernetes
View and validate pod, deployment, and service manifests before applying.
Docker Compose
Inspect multi-service Docker Compose configurations instantly.
GitHub Actions
Format and debug workflow YAML files for CI/CD pipelines.
Ansible
Read and validate Ansible playbooks and inventory files.