ekuiper-new/docs/en_US/sqls/functions/json_functions.md

JSON Functions

JSON functions manipulate JSON string or return information about JSON. There are several json path manipulation functions. Please refer to json path functions for how to compose a json path.

TO_JSON

to_json(col)

Converts a value to a string containing the JSON representation of the value. If the input is NULL, the result is also NULL.

PARSE_JSON

parse_json(col)

Converts a JSON string to a value. If the input is NULL, the result is also NULL.

JSON_PATH_EXISTS

json_path_exists(col, json_path)

Check whether JSON path returns any item for the specified JSON value. Return bool value.

JSON_PATH_QUERY

json_path_query(col, json_path)

Get all items returned by JSON path for the specified JSON value.

JSON_PATH_QUERY_FIRST

json_path_query_first(col, json_path)

Get the first item returned by JSON path for the specified JSON value.