YAML Tools
Validate, format and convert YAML data instantly.
How to use the YAML tools
- Paste your YAML document into the input area.
- Press Parse to convert it to JSON, or Format to pretty-print the JSON output.
- Check the line count and root type shown below the input.
- Copy or reuse the converted result in another tool.
- Paste the generated JSON into the JSON toolkit when you need sorting or further processing.
When it helps
- Reading configuration files written in YAML.
- Converting YAML to JSON for an API or script.
- Validating the structure of a YAML document.
- Comparing YAML data with its JSON representation.
- Porting a YAML pipeline configuration into a JSON-based deployment tool.
Frequently asked questions
Is my YAML sent anywhere?
No. Parsing and conversion happen locally in your browser and the document never leaves your device.
What are the limitations?
The converter follows the YAML subset supported by the bundled parser, so very exotic features may not round-trip. The output is JSON rather than a re-formatted YAML document.
Does it convert YAML to JSON?
Yes. The parse and format actions both produce JSON, so you can take the structure into JSON-based tools.
How do I know the document is valid?
If the input is invalid, the status area shows an error message and the output stays empty.
Does it show document statistics?
Yes. The line count and the root type, such as object or array, update as you edit the input.
Are comments preserved in the output?
Comments are a YAML feature and do not exist in JSON, so they are dropped during conversion. The tool focuses on the data structure rather than authoring notes. If comments matter, keep the original YAML alongside the converted JSON and use the output only where JSON is required.