parse_json

Description

Converts a string to a JSON value.

Syntax

parse_json(string_expr)

Parameters

string_expr: the expression that represents the string. Only the STRING, VARCHAR, and CHAR data types are supported.

Return value

Returns a JSON value.

Note: If the string cannot be parsed into a standard JSON value, the PARSE_JSON function returns NULL (see Example 5). For information about the JSON specifications, see RFC 7159.

Examples

Example 1: Convert a STRING value of 1 to a JSON value of 1.

mysql> SELECT parse_json('1');
+-----------------+
| parse_json('1') |
+-----------------+
| "1"             |
+-----------------+

Example 2: Convert an array of the STRING data type to a JSON array.

mysql> SELECT parse_json('[1,2,3]');
+-----------------------+
| parse_json('[1,2,3]') |
+-----------------------+
| [1, 2, 3]             |
+-----------------------+

Example 3: Convert an object of the STRING data type to a JSON object.

mysql> SELECT parse_json('{"star": "rocks"}');
+---------------------------------+
| parse_json('{"star": "rocks"}') |
+---------------------------------+
| {"star": "rocks"}               |
+---------------------------------+

Example 4: Construct a JSON value of NULL.

mysql> SELECT parse_json('null');
+--------------------+
| parse_json('null') |
+--------------------+
| "null"             |
+--------------------+

Example 5: If the string cannot be parsed into a standard JSON value, the PARSE_JSON function returns NULL. In this example, star is not enclosed in double quotation marks ("). Therefore, the PARSE_JSON function returns NULL.

mysql> SELECT parse_json('{star: "rocks"}');
+-------------------------------+
| parse_json('{star: "rocks"}') |
+-------------------------------+
| NULL                          |
+-------------------------------+

Keywords

parse_json, parse json

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