Customizable YAML Prettifier
Format YAML files exactly how you want with customizable rules. Set indentation, line width, quoting, and more to enforce consistent styling across your team's configuration files.
YAML Prettifier
Format and beautify YAML with custom indentation
How Custom YAML Prettifying Works
YAML prettifying transforms compact or inconsistently formatted YAML into a clean, readable structure. This tool goes beyond basic formatting by letting you customize indentation, line width, quoting style, and other formatting rules.
The prettifier parses your YAML into a data structure, then regenerates it according to your specified rules. This ensures consistent formatting across your team's configuration files and documentation.
Here's the process:
- YAML is parsed into an abstract syntax tree
- Your formatting rules are applied to each node
- Output is generated with consistent styling
- Result is valid YAML with your preferred format
Team benefit: Custom formatting rules ensure everyone on your team produces identical YAML style, eliminating formatting debates in code reviews.
When You'd Actually Use This
Team style enforcement
Enforce consistent YAML formatting across your team. Set indentation (2 vs 4 spaces), quoting rules, and line width. Everyone's configs look identical.
Code review preparation
Format YAML before submitting pull requests. Clean, consistent formatting makes reviews focus on actual changes rather than whitespace differences.
Legacy file modernization
Update old YAML files to match current standards. Reformat inherited configs to your team's style guide without manual editing.
Documentation generation
Create publication-ready YAML examples. Format configs for documentation, books, or tutorials with consistent, readable styling.
CI/CD pipeline standardization
Auto-format YAML in continuous integration. Add prettifying to your pipeline to catch and fix formatting issues before deployment.
Multi-project consistency
Maintain identical YAML style across multiple repositories. Use the same formatting rules for all projects in your organization.
What to Know About YAML Formatting
Indentation must be consistent. YAML requires consistent indentation within a file. Choose 2 spaces (common) or 4 spaces (traditional), but never mix tabs and spaces.
Quoting affects readability. Quotes around strings are optional in many cases. Consistent quoting rules (always quote, never quote, or quote-only-when-needed) improve visual consistency.
Line width impacts readability. Long lines are hard to read. Set a max width (80 or 120 characters) to ensure YAML displays well in editors and terminals.
Comments are preserved. Unlike minification, prettifying keeps all comments intact. Your documentation stays with the formatted output.
Pro tip: Save your formatting rules as a config file. Many YAML tools support configuration files so your team can share and enforce the same formatting automatically.
Common Questions
What's the standard YAML indentation?
Two spaces is the modern convention, especially in DevOps tools like Kubernetes and Ansible. Four spaces was common historically. Avoid tabs—YAML parsers may reject them.
Should I quote all strings?
It depends on your style guide. Quoting everything is explicit and safe. Quoting only when needed (special characters, numbers that look like strings) is cleaner. Be consistent.
Does formatting change the data?
No. Prettifying only changes whitespace and formatting. All data values, structure, and comments remain identical. The YAML is semantically unchanged.
Can I format invalid YAML?
No. The YAML must be valid to parse. Fix syntax errors first, then prettify. This tool will show error messages if your YAML has issues.
How do I enforce formatting in my team?
Use pre-commit hooks or CI checks. Run the prettifier automatically on YAML files before commits. Reject PRs with formatting issues until they're fixed.
Does this work with YAML anchors?
Yes. Anchors (&) and aliases (*) are preserved and formatted correctly. The prettifier maintains all YAML features including custom tags.
Is my YAML sent to a server?
No. All formatting happens locally in your browser. Your YAML never leaves your computer. This tool works offline after the initial page load.
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