YAML to JSON Converter
Convert between YAML and JSON formats instantly in your browser.
About YAML to JSON Converter
This free online tool converts between YAML and JSON formats instantly in your browser. No external dependencies or libraries are used — the YAML parser and JSON-to-YAML serializer are implemented entirely in JavaScript. Your data never leaves your browser, making it completely private and secure.
How to Use
- To convert YAML to JSON, paste your YAML into the left textarea and click YAML → JSON.
- To convert JSON to YAML, paste your JSON into the right textarea and click JSON → YAML.
- Use the Copy buttons to copy either side to your clipboard.
- If there is a syntax error in your input, a clear error message will appear below the textareas.
Frequently Asked Questions
What is YAML?
YAML (YAML Ain’t Markup Language) is a human-readable data serialization format commonly used for configuration files, deployment manifests (like Kubernetes), CI/CD pipelines, and more. It uses indentation to represent structure instead of braces or brackets.
When should I use YAML vs JSON?
YAML is generally preferred for configuration files because it is easier to read and write by hand. JSON is typically used for data interchange between systems and APIs because it is more strict and universally supported by programming languages.
What YAML features are supported?
This converter supports key-value pairs, nested objects (indentation-based), arrays (using the dash syntax), strings, numbers, booleans, null values, and quoted strings. Advanced features like anchors, aliases, and multi-line strings are not supported.
Is my data sent to a server?
No. All conversion happens entirely in your browser using client-side JavaScript. Your YAML and JSON data never leaves your machine.