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Free online YAML viewer and pretty-printer with syntax highlighting. View, format, and validate YAML configuration files in your browser.
1name: my-app2version: "1.0"3description: A sample YAML file45server:6 host: localhost7 port: 80808 debug: true910features:11 - authentication12 - logging13 - caching1415config:16 database:17 driver: postgres18 host: db.example.com19 port: 543220 name: mydb21 cache:22 enabled: true23 ttl: 36002425metadata:26 created: 2024-01-1527 author: null
YAML parsing is done with a simple client-side parser. For complex YAML features, use a dedicated library.
Pretty-print and view YAML with syntax highlighting. Features color-coded keys, strings, numbers, booleans, and comments. Includes validation for common YAML syntax errors, line numbers, and copy functionality for the formatted output.
YAML files can be difficult to read and debug without proper formatting; this tool provides instant syntax highlighting and validation, making it easy to spot errors and understand YAML structure visually.
DevOps engineers, developers working with Kubernetes/Docker configurations, CI/CD pipeline authors, and anyone who regularly reads or writes YAML files.
Paste your YAML text into the input textarea
The syntax-highlighted output appears below in real-time
Color coding: blue for keys, green for strings, orange for numbers, purple for booleans
Click the Copy button to copy the formatted YAML to your clipboard
Enable Word Wrap for long lines that would otherwise require horizontal scrolling
Syntax errors are displayed in a red warning banner above the output
A Kubernetes deployment YAML with pods, services, and configmapsA Docker Compose file with multiple services and volumesA GitHub Actions workflow with jobs, steps, and environment variablesThe most common cause is inconsistent indentation. YAML is indentation-sensitive and requires spaces (not tabs).
This tool supports basic YAML: scalars, sequences, mappings, and inline collections. Advanced features like anchors and complex keys may not render correctly.
The output is read-only for viewing. Edit the input textarea to make changes.
It works well for files up to a few hundred lines. For very large files, consider using a dedicated YAML editor.
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