Add a column that contains the length of the JSON data
When investigating JSON data it can be helpful to identify the lengths of the JSON objects or arrays, especialy when they are 'ragged' across documents. The json_lengths() function adds a column (default name "length") that contains the 'length' of the JSON associated with each row. For objects, this will be equal to the number of keys. For arrays, this will be equal to the length of the array. All scalar values will be of length 1.
json_lengths(x, column.name = "length")
a tbl_json object
the name to specify for the length column
a tbl_json object with column.name column that tells the length
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