YAML & TOML
Format, validate and view YAML and TOML configuration files.
YAML Formatter & Beautifier
This YAML formatter normalises indentation, quoting and flow style across a whole document.
YAML Validator
This YAML validator parses your document and reports the first error with its line and column.
YAML Viewer
This YAML viewer renders a document as a collapsible tree so the nesting becomes obvious.
TOML Validator
This TOML validator reports the first error with its line and column.
About YAML & TOML
YAML and TOML are the two formats configuration files are usually written in, and both are unforgiving in ways that are easy to miss by eye. YAML takes its structure from indentation, so a single misplaced space changes what the document means rather than failing outright, and the validator here reports the line and column of the first problem instead of a generic parse failure. TOML is stricter about types and table headers, and its validator catches the duplicate keys and malformed tables that a quick read will not. Both formatters normalise the things each format lets you write several ways, and the viewers give you a collapsible tree for exploring a long manifest or workflow file. To move a document into or out of these formats, the converters are in Data Converters.
Everything on this page runs directly in your browser — none of your input is uploaded, and every tool keeps working when you are offline.