OR operator in JSONPath?
From the JSONPath page:
[,] - Union operator in XPath results in a combination of node sets. JSONPath allows alternate names or array indices as a set.
Try
$..log[?(@.severity == 'WARN'), ?(@.severity == 'Error')]Edit: Looks like there is an open issue for logical AND and OR operators in which they state that the operators are not yet supported by JSONPath.