How To Format Yaml
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Indentation rules
YAML uses indentation to express structure. Two spaces per level is the universal convention. Tabs are not allowed for indentation—the YAML spec explicitly bans them, and every parser will reject a document indented with tabs. Each nested level must be indented at least one space more than its parent, and all siblings at the same level must share the exact same indentation. The spec does not mandate exactly two spaces, but any consistent number works; the community has settled on two.
Strings and when to quote them
YAML supports two styles for collections. Block style uses indentation and dashes, which is the readable default for config files. Flow style uses braces and brackets like JSON, which is compact but harder to diff. Flow style is appropriate for short inline collections—a tag list or small record—but unreadable when nested. A common convention is block style for everything except short arrays that fit on one line.