Format, beautify, and validate YAML files instantly. Convert YAML to JSON. Our free online tool processes everything locally in your browser, ensuring your data stays private and secure.
Saved Presets is a Supporter feature.
Tool History is a Supporter feature.
Tool Notes is a Supporter feature.
Copy your unformatted or messy YAML data and paste it into the input field on the left. The tool accepts any valid YAML including nested structures, arrays, and multi-line strings.
Select your preferred indentation level: 2 spaces (common in most YAML files) or 4 spaces. The choice is purely stylistic and doesn't affect the data itself.
Click 'Format' to beautify your YAML with proper indentation, or click 'To JSON' to convert your YAML data to JSON format.
Once formatted, use the 'Copy' button to copy the result to your clipboard, or click 'Download' to save it as a .yaml or .json file.
Our YAML formatter uses the js-yaml library to parse and format YAML documents. All processing happens locally in your browser, ensuring complete privacy and enabling offline functionality.
The tool parses your YAML using the js-yaml library, which follows the YAML 1.1 specification. It validates indentation, checks for duplicate keys, verifies proper quoting of special characters, and reports any syntax errors.
After successful parsing, the formatter reconstructs the YAML string with consistent indentation. You can configure indentation to use either 2 or 4 spaces. The formatter preserves data types and structure while normalizing whitespace.
The YAML to JSON conversion first parses the YAML into a JavaScript object, then serializes it to JSON with proper indentation. This process validates the YAML and produces standard JSON output.
Optimal performance for files up to 10MB; larger files may cause browser lag. Custom YAML tags are not supported. Multi-document YAML files (with ---) process only the first document.
Yes, our YAML formatter is completely free with no registration required. You can format unlimited YAML data directly in your browser without any costs or subscriptions.
