YAML Formatter

Paste YAML to format it with consistent indentation and validate its syntax. Catches errors with clear messages so you can fix config files before deploying.

Paste YAML to format and validate it. Invalid syntax shows an error with details.

Indent:

Input YAML

Formatted YAML

What this tool does

Paste any YAML and the tool reformats it with clean, consistent indentation. If the YAML is invalid, you get a clear error message pointing to the problem. Choose between 2-space and 4-space indentation depending on your project's convention.

Why validate YAML?

YAML is whitespace-sensitive, so a single wrong indent can break your entire config. Kubernetes manifests, Docker Compose files, CI/CD pipelines, and Ansible playbooks all use YAML. A validation check before deploying catches problems that would otherwise show up as cryptic runtime errors.

Common YAML mistakes

Mixing tabs and spaces (YAML only allows spaces). Forgetting to quote strings that look like numbers or booleans - 'yes', 'no', 'true', 'false' all get parsed as booleans unless quoted. Incorrect indentation on nested keys. Missing colons after keys. This formatter catches all of these.