YAML Validator & Formatter
Waiting for input…
Validate and format YAML online
Paste your YAML data – for example from a docker-compose.yml, a Kubernetes manifest or a CI pipeline. The tool checks the syntax in real time and, on errors, shows the exact message with line information. Everything runs in the browser (js-yaml); no data is sent to a server.
- Live validation: Every keystroke is checked immediately – green for valid, red for invalid YAML.
- Format: “Format / Prettify” cleanly re-indents the structure with 2-space indentation.
- Common pitfall: YAML forbids tabs for indentation – always use spaces.