YAML to JSON
Convert between YAML and JSON formats with validation
YAML / JSON input
Choose formats, enter data and convert. Your data stays on this device.
About these formats
YAML lists, quoted strings and multiline values are preserved.
JSON output validates the document. YAML output quotes values when necessary.
Converted data
- Input size
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- Output size
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- Size change
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About the YAML to JSON Converter
Our free YAML to JSON converter provides instant, bidirectional conversion between YAML and JSON, the two most popular data serialization formats used in modern software development. When you are translating a Kubernetes manifest into JSON for an API call or turning a JSON config file into human-readable YAML, this tool delivers accurate results in milliseconds.
YAML's clean, indentation-based syntax is favored for configuration files, CI/CD pipelines, and infrastructure-as-code definitions. JSON, on the other hand, is the universal language of web APIs and JavaScript applications. Developers and DevOps engineers frequently need to switch between the two when debugging deployments, sharing configs with teammates, or feeding data into different toolchains.
This converter handles nested objects, arrays, booleans, numbers, nulls, and comments with full data-type preservation. Upload a file or paste content directly, review the conversion statistics, and download or copy the result. Your configuration secrets and sensitive data are never uploaded.
Key Features
- Bidirectional YAML-to-JSON and JSON-to-YAML conversion
- Automatic data-type detection for booleans, numbers, nulls, and strings
- Nested object and array structure preservation
- File upload support for .yaml, .yml, and .json files
- Conversion statistics showing input size, output size, and size change
- One-click download of the converted file in the correct format
- Copy-to-clipboard button for quick pasting into editors or terminals
- Built-in sample data to explore the tool without preparing your own input
- Real-time error reporting with clear, actionable messages
- Your data is never uploaded
How to Use
- Choose the direction: Click "YAML to JSON" or "JSON to YAML" to set the conversion mode.
- Provide input: Paste your content into the input area, upload a file, or click "Sample" to load example data.
- Convert: Press the Convert button to generate the output instantly.
- Review statistics: Check the input size, output size, and percentage size change below the editors.
- Download or copy: Click "Download" to save the result as a file, or "Copy" to place it on your clipboard.
Use Cases
- Kubernetes & Docker: Convert YAML manifests to JSON for kubectl commands or API calls, and vice versa.
- CI/CD pipelines: Translate GitHub Actions, GitLab CI, or CircleCI YAML configs into JSON for programmatic manipulation.
- Ansible & Terraform: Switch between YAML variables files and JSON parameter files used by different IaC tools.
- API development: Convert JSON API responses into YAML for human-readable documentation or configuration samples.
- Configuration management: Standardize application settings across teams that prefer different serialization formats.
- Data migration: Transform structured data between YAML and JSON when moving between platforms or services.
- Learning & teaching: Compare the same data structure in both formats side by side to understand each syntax.
Frequently Asked Questions
Does it handle YAML comments?
YAML comments (lines starting with #) are parsed and ignored during conversion, since JSON does not support comments. The data values are preserved accurately.
Can I convert multi-document YAML?
The tool currently processes single-document YAML. For multi-document files, separate each document and convert them individually.
What YAML features are supported?
The converter supports key-value pairs, nested mappings, sequences (arrays), scalar types (strings, numbers, booleans, null), and inline arrays.
Tips & Best Practices
- Validate indentation: YAML is whitespace-sensitive. Use consistent 2-space indentation to avoid parsing errors.
- Quote special strings: Strings that look like booleans (yes, no, true, false) or numbers should be quoted in YAML to prevent unintended type conversion.
- Use the sample data: Load the built-in sample to understand the expected YAML structure before pasting your own content.
- Check the size change: The conversion statistics help you understand how verbose each format is for your particular data.
- Round-trip test: Convert YAML to JSON and then back to YAML to verify that no data was lost during the transformation.
- Strip sensitive values: Even though processing is local, consider redacting passwords or tokens before sharing converted output with others.