JSONPath is a query language for JSON. A JSONPath expression specifies a path to an element in a JSON structure.
JSONPath expressions, including property names and values, are case-sensitive.
Paths use the dot notation: $.store.book.title
|$||The root object or array.|
|.property||Selects the specified property in a parent object.|
|[n]||Selects the n:th element from an array. Indexes are 0-based.|
An index, as referred to by 'n' in the above table, may be replaced with an iterator expression.
Doing so means the index referred to by 'n' will start at 0 and then increment at an interval.
Means 'n' starts at 0 and increments by 1 every 20 seconds.