A YAML editor validates YAML syntax in real time, showing exact error lines so you can fix config files, CI/CD pipelines, and Kubernetes manifests without running a build. This tool also supports TOML and converts between YAML, TOML, and JSON formats.
JSON Preview
How to Use the YAML Editor
The YAML editor validates your YAML or TOML in real time as you type, showing the exact line and column of any syntax error so you can fix it immediately. It also converts between formats, making it easy to work with configuration files across different tools and ecosystems.
Validating YAML
Paste your YAML into the editor. The validator checks your YAML as you type and displays a green checkmark for valid YAML or a red error with the exact line number for invalid YAML. Common YAML errors include inconsistent indentation, missing colons after keys, tabs where spaces are required, and unquoted strings that contain special characters.
Converting YAML to JSON
After entering valid YAML, click YAML → JSON to see your YAML data as formatted JSON in the right panel. This is useful for debugging how applications will parse your config files — tools like Kubernetes and Docker Compose read YAML and convert it internally to a JSON-like structure.
Converting JSON to YAML
Click JSON → YAML to paste a JSON object and convert it to clean YAML output. The tool produces properly indented YAML with 2-space indentation, array indicators, and quoted strings where needed.
TOML Mode
Click the TOML button to switch to TOML mode for parsing Cargo.toml, pyproject.toml, and other TOML configuration files. The parsed output shows the data structure as JSON in the right panel.
FAQ
Is this YAML editor free?
Yes, the YAML and TOML editor is completely free with no account required. Validate, format, and convert YAML or TOML without any usage limits.
Is my YAML data safe and private?
Yes. All parsing and validation happens in your browser using js-yaml. Your YAML or TOML content is never sent to any server and is not stored or logged.
What YAML features does the validator support?
The validator supports YAML 1.2 through js-yaml, including nested objects and arrays, multi-line strings (literal and folded blocks), anchors and aliases, explicit type tags, comments, and all YAML scalar types.
Can I convert YAML to JSON?
Yes. After loading valid YAML, click the 'YAML to JSON' button to convert the parsed YAML to formatted JSON output. The JSON appears in the preview panel on the right and can be downloaded or copied.
Can I convert JSON to YAML?
Yes. Click 'JSON to YAML' to paste JSON in the input and convert it to YAML format. The tool uses js-yaml to produce clean, properly indented YAML output.
What TOML features are supported?
The TOML parser handles key-value pairs, sections (tables), arrays, inline tables, and multi-line strings as commonly used in configuration files like Cargo.toml, pyproject.toml, and GitHub Actions workflows. Full TOML 1.0 spec edge cases may not be fully covered.
What does the JSON preview show?
The JSON preview shows your YAML or TOML data converted to a formatted JSON object. This is useful for verifying how your config file will be parsed by applications that read YAML or TOML, and for spotting unintended type coercions.