JSON / YAML Converter
Convert between JSON and YAML formats
JSON Input
YAML Output
What it does: Convert between JSON and YAML formats. This free online tool works entirely in your browser with no installation required.
How to use:
- Click JSON to YAML or YAML to JSON to set the conversion direction.
- Copy your source data and paste it into the input panel.
- Press Convert to transform your data, then use the Copy button to grab the result.
Privacy: All processing happens in your browser. No data sent to servers.
Best for: Anyone who needs quick JSON / YAML Converter without installing software.
JSON vs. YAML: Key Differences
JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language) are both data serialization formats, but they differ significantly in syntax and typical use cases. Understanding their differences helps you choose the right format for your project.
Format Comparison
- Syntax — JSON uses braces
{}, brackets[], and commas with strict punctuation. YAML uses indentation (similar to Python) and is generally more readable for humans. - Comments — JSON does not support comments. YAML supports comments using the
#character, making it a better choice for configuration files where explanations are helpful. - Data types — Both support strings, numbers, booleans, arrays, and objects/maps. YAML also supports additional types like dates and timestamps natively.
- Multi-line strings — JSON requires
\nfor line breaks. YAML provides block scalar syntax using|(literal) and>(folded) for readable multi-line strings. - File size — JSON is more compact due to its minimal syntax. YAML files tend to be larger due to the extra whitespace, though they are more readable.
When to Use Each Format
- Configuration files — YAML is the preferred format for configuration in many modern tools including Docker Compose, Kubernetes, CI/CD pipelines (GitHub Actions, GitLab CI), and Ansible.
- API data exchange — JSON dominates web APIs, REST endpoints, and data exchange between services due to its lightweight parsing and universal language support.
- Data storage — JSON is commonly used in NoSQL databases like MongoDB. YAML is rarely used for data storage.
- Documentation — YAML works well for documentation that includes code examples because it is easier to read and supports comments.