YAML
What Causes This YAML Error?
Incorrect indentation, nesting mappings in sequences, duplicating mapping keys, or unquoted keys that conflict with YAML syntax.
Should I Use Tabs Or Spaces For Indentation In YAML?
Spaces only – 2 or 4 spaces are common. Tabs can cause unexpected formatting issues.
Can I Put A Mapping Inside A Sequence Like A List?
No, sequences can only contain scalar/primitive values not other nested mappings.
What If I Need A Mapping Value Inside A Sequence?
Wrap it in a block scalar using | or > to escape it from being parsed as a mapping.
Do Mapping Keys Need To Be Quoted?
Quote any keys that conflict with boolean or numeric YAML types like “true” or “123”.
What’s The Fastest Way To Resolve YAML Mapping Errors?
Check indentation consistency, separate mappings/sequences properly, quote problematic mapping keys.
How Can I Best Avoid Mapping-Related Errors In My YAML?
Stick to consistent spacing rules, don’t nest maps in sequences, avoid duplicate keys.
How Do I Resolve A “Mapping Values Are Not Allowed Here” Error In YAML?
The “Mapping Values not allowed” YAML error typically occurs due to inconsistent indentation, improper nesting of mappings and sequences, or unquoted mapping keys that conflict with YAML syntax.
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