Invalid JSON text in argument 2 - json_contains in MySQL 5.7.8
If the column name store tags only (one level array), like ["ART","LIT","SPORTS"]
JSON_CONTAINS(column_name, 'ART', '$')If the column name store an key-value array like {"tag":"ART","other":"NONE"}
JSON_CONTAINS(column_name, 'ART', '$.tag')Finally if tag value is inside a parent array, you need to use path like this:
JSON_CONTAINS(column_name, 'ART', '$.parent.tag')https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html#function_json-contains
If your candidate type is string,just add double quotes on your candidate then try again.
json_contains(\`column_name`,'"ART"')