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View and navigate YAML with collapsible tree and validation. Use for read-only inspection; for editing/validation use yaml-formatter. Input: YAML ≤10MB. Returns tree view or error. 100% client-side.
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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.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
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 variablesWhy doesn't my YAML parse correctly?
The most common cause is inconsistent indentation. YAML is indentation-sensitive and requires spaces (not tabs).
What YAML features are supported?
This tool supports basic YAML: scalars, sequences, mappings, and inline collections. Advanced features like anchors and complex keys may not render correctly.
Can I edit the highlighted output?
The output is read-only for viewing. Edit the input textarea to make changes.
Is this tool suitable for large YAML files?
It works well for files up to a few hundred lines. For very large files, consider using a dedicated YAML editor.
Authoritative specifications, standards, and in-depth reading for YAML Viewer.
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.
Format and validate YAML with syntax checks. Use for YAML editing; for JSON to YAML conversion use json-to-yaml, for TOML/YAML/JSON cross-conversion use toml-converter. Input: YAML ≤10MB. Returns formatted YAML or error. 100% client-side.
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Free online SQL formatter with indentation and keyword casing. Format queries privately in browser.
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Analyze text for word count, readability, and language stats. Paste and get instant insights.