MariaDB starting with 10.2.3

JSON functions were added in MariaDB 10.2.3.

Syntax

JSON_DEPTH(json_doc)

Description

Returns the maximum depth of the given JSON document, or NULL if the argument is null. An error will occur if the argument is an invalid JSON document.

  • Scalar values or empty arrays or objects have a depth of 1.
  • Arrays or objects that are not empty but contain only elements or member values of depth 1 will have a depth of 2.
  • In other cases, the depth will be greater than 2.

Examples

SELECT JSON_DEPTH('[]'), JSON_DEPTH('true'), JSON_DEPTH('{}');
+------------------+--------------------+------------------+
| JSON_DEPTH('[]') | JSON_DEPTH('true') | JSON_DEPTH('{}') |
+------------------+--------------------+------------------+
|                1 |                  1 |                1 |
+------------------+--------------------+------------------+

SELECT JSON_DEPTH('[1, 2, 3]'), JSON_DEPTH('[[], {}, []]');
+-------------------------+----------------------------+
| JSON_DEPTH('[1, 2, 3]') | JSON_DEPTH('[[], {}, []]') |
+-------------------------+----------------------------+
|                       2 |                          2 |
+-------------------------+----------------------------+

SELECT JSON_DEPTH('[1, 2, [3, 4, 5, 6], 7]');
+---------------------------------------+
| JSON_DEPTH('[1, 2, [3, 4, 5, 6], 7]') |
+---------------------------------------+
|                                     3 |
+---------------------------------------+

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