The coverage command counts the number of times each JSON field is non-empty.

Run the help command to read its description, output format and options:

$ ocdscardinal help coverage
Count the number of times each field is non-empty in a line-delimited JSON file

The command walks the JSON tree, counting non-empty nodes. Empty nodes are "", [], {} and null, and
any nodes containing only empty nodes.

The result is a JSON object, in which keys are paths and values are counts.

The "" path corresponds to a line. A path ending with / corresponds to an object. A path ending with
[] corresponds to an array element. Other paths correspond to object members.

Usage: ocdscardinal[EXE] coverage [OPTIONS] <FILE>

          The path to the file (or "-" for standard input), in which each line is JSON text

  -v, --verbose...
          Increase verbosity

  -h, --help
          Print help (see a summary with '-h')


Given this line-delimited JSON file:

{"phoneNumbers": [{"type": "home", "number": "212 555-1234"}, {"type": "office", "number": "646 555-4567"}]}

The coverage command outputs:

$ ocdscardinal coverage docs/examples/coverage.jsonl
{"/phoneNumbers[]/type": 2, "/phoneNumbers[]/number": 2, "/phoneNumbers[]/": 2, "/phoneNumbers[]": 2, "/phoneNumbers": 1, "/": 1, "": 1}



These edge cases are not expected to be encountered in real data.

If a member name is duplicated, only the last duplicate is considered:

$ ocdscardinal coverage docs/examples/coverage-duplicate.jsonl

If a member name is empty, its path is the same as its parent object’s path:

$ ocdscardinal coverage docs/examples/coverage-empty.jsonl
{"/": 2, "": 1}

If a member name ends with [], its path can be the same as a matching sibling’s path:

$ ocdscardinal coverage docs/examples/coverage-bracket.jsonl
{"/a[]": 2, "/a": 1, "/": 1, "": 1}