Format, validate, and pretty-print YAML data with proper indentation. Fix common YAML errors and ensure valid syntax for configuration files.
Formatted YAML will appear here.
About YAML Prettify & Format
The YAML Prettify & Format tool transforms messy, inconsistent, or poorly indented YAML data into clean, properly structured output. YAML (YAML Ain't Markup Language) is the standard configuration format for modern DevOps tools like Docker Compose, Kubernetes, Ansible, Helm charts, and CI/CD pipelines. YAML's indentation-sensitive syntax makes formatting errors common and difficult to debug. Our formatter not only prettifies YAML but also detects and fixes common issues like inconsistent indentation, missing colons, and incorrect list formatting, ensuring your configuration files are valid and ready for deployment.
How to Use YAML Prettify & Format
Paste Your YAML: Copy your YAML configuration and paste it into the input textarea. It accepts any valid YAML including multi-document streams.
Click Format: Press the "Format YAML" button to automatically fix indentation, align colons, and structure your data properly.
Review Fixes: Check the status messages for any syntax issues detected. The tool highlights specific problems and line numbers.
Copy Result: Use the copy button to grab the clean YAML for your configuration files or version control.
Features
Auto-IndentationAutomatically fix inconsistent indentation with proper 2-space alignment throughout.
Syntax ValidationDetect YAML syntax errors including missing colons, bad indentation, and invalid characters.
Common Error FixesAutomatically fix common YAML issues like tab characters, trailing spaces, and missing values.
Key-Value AlignmentAlign colons consistently and format nested structures with proper hierarchy.
List FormattingFormat YAML lists and flow sequences with consistent dash placement and indentation.
Error ReportingShow line numbers and descriptions for any issues found in the YAML input.
Benefits
Well-formatted YAML prevents the dreaded "mapping values are not allowed here" and "indentation" errors that plague DevOps engineers. Our formatter catches these issues before they break your deployments. Consistent YAML formatting also improves code review efficiency, reduces merge conflicts, and makes configuration files maintainable across teams. Whether you're working with Kubernetes manifests, Docker Compose files, or GitHub Actions workflows, proper formatting is essential for reliability.
Use Cases
Kubernetes ManifestsFormat deployment, service, and configmap YAML files for clarity and correctness.
Docker Compose FilesClean up docker-compose.yml with proper service definitions and volume mounts.
Ansible PlaybooksFormat Ansible playbooks and roles for better readability and maintenance.
Why Use TooliFyra's YAML Formatter?
TooliFyra's YAML Formatter is specifically designed for the YAML quirks that trip up developers. Unlike generic text formatters, it understands YAML's indentation-sensitive syntax, flow vs. block style differences, and multi-line string indicators. The automatic fix suggestions help you learn proper YAML patterns while fixing your current files. All processing happens in your browser, keeping your infrastructure configurations private.
Frequently Asked Questions
Yes, YAML does not allow tab characters for indentation. The formatter detects tabs and replaces them with spaces, fixing one of the most common YAML errors that causes "found character '\t' that cannot start any token" messages.
Yes, the formatter supports multi-document YAML streams separated by --- (document start marker). Each document is formatted independently while maintaining proper separation.
The formatter primarily works with block style YAML, which is the standard for configuration files. Flow style (inline JSON-like syntax) is preserved but the formatter focuses on making block style consistent and readable.
The formatter uses 2-space indentation, which is the YAML community standard and the default for most tools like Kubernetes, Docker Compose, and GitHub Actions.