YAML Viewer, Formatter & Parser
Free online YAML viewer, parser and formatter. Validate, pretty-print, sort keys, and explore YAML in a collapsible tree — 100% in your browser.
Paste your input, drop a file, or
About this tool
Paste or upload a YAML file to validate, format, or explore it as a tree. Powered by js-yaml. Everything runs in your browser.
About YAML Viewer, Formatter & Parser
Paste a YAML document to validate it, pretty-print it with consistent indentation, and browse its structure as a collapsible tree. You can sort mapping keys alphabetically and expand or collapse nested blocks to find the value you need. If the YAML has a syntax error, the tool points to where parsing failed.
The parser runs entirely in your browser, so configuration files for Kubernetes, CI pipelines, or Docker Compose stay on your machine. Many editors use the tree view to confirm that deeply nested service definitions are shaped the way they expect.
Frequently asked questions
- Can I convert YAML to JSON here?
- Yes. YAML parses into the same data model as JSON, so the tool can show the equivalent JSON output.
- Why does my YAML fail to parse?
- The most common causes are inconsistent indentation, tabs used instead of spaces, or unquoted values that contain special characters.
- Does sorting keys change my data?
- No. Sorting only reorders mapping keys for readability; the values and structure stay the same.