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Showing content from https://arduinojson.org/v7/api/jsonarray/size/ below:

Description

JsonArray::size() gets the number of elements in the array pointed by the JsonArray.

If the JsonArray is null, this function returns 0.

Internally, this function walks a linked-list to count the elements, so its time complexity is O(n).

Don’t use this function to create a for loop; instead, use iterators.

Signature Return value

JsonArray::size() returns an unsigned integer containing the number of elements in the array.

Example

JsonArray array = doc.to<JsonArray>();
array.add("hello");
array.add("world");
Serial.println(array.size()); // 2