YAML / JSON Converter
Convert between YAML and JSON formats quickly and easily
What is YAML / JSON Converter?
YAML/JSON Converter is a free online tool that converts between YAML and JSON formats quickly and easily. YAML and JSON are two of the most popular data serialization formats used in configuration files, API responses, and data exchange. YAML is human-readable with indentation-based structure and comment support, while JSON uses braces and quotes with native JavaScript support. This tool allows bidirectional conversion, handling nested structures, arrays, and complex data types correctly. All processing happens in your browser with no data sent to any server.
How to Use
- Enter YAML on the left or JSON on the right.
- Click 'YAML to JSON' to convert YAML to JSON.
- Click 'JSON to YAML' to convert JSON to YAML.
Tips & Best Practices
- Convert YAML config files to JSON when integrating with JavaScript applications that expect JSON.
- Convert JSON API responses to YAML for more readable manual inspection and documentation.
- Be aware that YAML comments are lost when converting to JSON, as JSON does not support comments.
- Use this tool to validate your YAML by converting to JSON - if conversion fails, your YAML has syntax errors.
- JSON is stricter than YAML - unquoted strings that are valid in YAML may cause issues.
Use Cases
DevOps
Convert between YAML (Kubernetes, Docker Compose) and JSON (Terraform, AWS CLI) configuration formats.
API Development
Convert JSON API responses to YAML for documentation or configuration file creation.
Configuration Migration
Migrate configuration files between systems that prefer different formats.
Data Validation
Validate YAML syntax by converting to JSON - conversion failure indicates syntax errors.
FAQ
What is the difference between YAML and JSON?
YAML is more human-readable with indentation-based structure and supports comments, while JSON uses braces and quotes and is natively supported by JavaScript.
Can all JSON be converted to YAML?
Yes, all valid JSON can be represented as YAML. However, some YAML features like anchors and comments have no JSON equivalent.
What is YAML?
YAML (YAML Ain't Markup Language) is a human-readable data serialization format widely used for configuration files in Kubernetes, Docker Compose, CI/CD pipelines, and more.
Is my data sent to any server?
No, all conversions are processed locally in your browser and no data is transmitted externally.
What are the key differences between YAML and JSON?
YAML uses indentation for better readability and supports comments, while JSON uses braces/brackets for faster parsing and is the default format for most APIs.
Are there any caveats when converting YAML?
In YAML, values like yes/no and on/off may be automatically interpreted as booleans, so wrap them in quotes if you want to keep them as strings.
Is my data collected?
No, all conversion happens in your browser. No data is sent to any server.
Are YAML comments preserved when converting to JSON?
No, JSON does not support comments. YAML comments are lost during conversion to JSON.
Can it handle nested structures?
Yes, the tool correctly handles deeply nested objects, arrays, and mixed data types in both formats.
What YAML features are not supported in JSON?
JSON does not support comments, anchors/aliases, multi-line strings, or complex keys that YAML allows.
Why does my YAML fail to convert?
Common issues include incorrect indentation (YAML is whitespace-sensitive), missing colons, or tabs instead of spaces.
Can I convert large files?
Yes, the tool handles large data sets efficiently in your browser.