Free Online YAML Formatter — Validate & Convert YAML to JSON
Beautify, validate, minify, and convert YAML to JSON (or JSON to YAML) online for free. Paste or upload a file — no signup, private browser-only.
YAML Input
YAML Output
Quick answer
To format or validate YAML, paste or upload it into the KaviForge YAML Formatter and click Format. Indentation is normalized and syntax errors are reported with their location. You can also convert YAML to JSON or JSON to YAML in one click. Nothing is uploaded, so Kubernetes secrets and CI configs stay private.
Format, validate, and convert YAML files instantly with this free online tool. Whether you need to beautify YAML configuration files, convert between YAML and JSON formats, or validate YAML syntax, this tool handles all your YAML processing needs.
All processing happens in your browser for complete privacy. No data is uploaded to any server, ensuring your sensitive configuration files stay secure. Perfect for developers working with Docker, Kubernetes, CI/CD pipelines, and configuration management.
How to Use This YAML Formatter
- 1Select your tool mode: "YAML Formatter", "YAML to JSON", or "JSON to YAML" from the dropdown.
- 2Paste your YAML or JSON data into the input panel or upload a file based on your selected mode.
- 3Choose your indent size for formatted output (2, 3, 4, or 5 spaces).
- 4Click "Format / Beautify" to format YAML, or "Convert" to transform between formats.
- 5Use "Validate" to check if your input is valid before processing.
- 6Copy or download the formatted or converted output for use in your project.
Features
YAML Formatting
Format and beautify YAML files with customizable indentation. Make configuration files readable and maintainable.
Bidirectional Conversion
Convert YAML to JSON or JSON to YAML with a simple mode selector. Switch between formats instantly.
YAML Validation
Validate YAML syntax to catch errors before deployment. Get detailed error messages pointing to issues.
Minify YAML
Remove unnecessary whitespace and line breaks to create compact YAML files for production use.
Customizable Indentation
Choose indentation size (2, 3, 4, or 5 spaces) to match your project's coding standards and preferences.
File Upload
Upload YAML or JSON files directly from your computer for quick processing based on your selected mode.
Copy & Download
Copy processed output to your clipboard or download it as a `.yaml` or `.json` file with one click.
Syntax Highlighting
Beautiful syntax highlighting for both YAML and JSON makes it easy to read and understand your data structures.
When to Use the YAML Formatter
Kubernetes and Helm manifests
Validate indentation in Deployments, Services, and values.yaml before running kubectl apply.
CI/CD pipelines
Check GitHub Actions, GitLab CI, and Azure Pipelines YAML for syntax errors before committing.
Docker Compose and OpenAPI
Clean up docker-compose.yml or OpenAPI specs, or convert them to JSON for other tools.
About YAML Formatting
YAML (YAML Ain't Markup Language) is a human-readable data serialization standard commonly used for configuration files, data exchange, and application settings. It's widely adopted in DevOps tools like Docker, Kubernetes, Ansible, and CI/CD platforms due to its clean syntax and readability.
YAML formatting makes configuration files easier to read, maintain, and debug. Converting between YAML and JSON is often necessary when working with APIs that require JSON, migrating between systems, or when different tools require different formats.
This tool provides comprehensive YAML processing capabilities including formatting with customizable indentation, validation to catch syntax errors, minification for compact files, and bidirectional conversion between YAML and JSON while preserving data structure and types.
YAML Formatter FAQs
Is this YAML formatter safe to use?
Yes. All processing runs entirely in your browser. Your YAML data is never uploaded or stored on any server, ensuring complete privacy and security.
Does this tool save my data?
No. Once you refresh the page or close the tab, your input is cleared. Nothing is persisted or cached beyond your session.
Can I convert between YAML and JSON?
Yes! This tool supports bidirectional conversion. Select "YAML to JSON" or "JSON to YAML" mode from the dropdown to convert between formats while preserving data structure and types.
What YAML features are supported?
The tool supports all standard YAML features including nested objects, arrays, strings, numbers, booleans, null values, and multi-line strings. It handles complex YAML structures commonly used in configuration files.
Can I format YAML configuration files?
Absolutely. Use the "YAML Formatter" mode to beautify your YAML files with consistent indentation. This is perfect for Docker Compose files, Kubernetes manifests, and CI/CD configuration files.
How does YAML minification work?
YAML minification removes unnecessary whitespace and line breaks while preserving the data structure. This creates compact YAML files suitable for production environments where file size matters.
What file formats are supported for upload?
You can upload `.yaml` or `.yml` files when in YAML Formatter or YAML to JSON mode, and `.json` files when in JSON to YAML mode. The tool automatically validates the file type based on your selected mode.
Can I use this for Kubernetes YAML files?
Yes! This tool is perfect for formatting and validating Kubernetes YAML manifests. It helps ensure your configuration files are properly formatted and error-free before deployment.
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