There are multiple options for storing JSON in ClickHouse, depending on the type of JSON being stored. For structured JSON that follows a known fixed schema, normal ClickHouse column types can be used, offering excellent performance and support for all ClickHouse functionality. However, this approach requires manually managing the JSON key to ClickHouse column mapping, which can lead to issues if new keys are introduced without updating the table schema. In contrast, unstructured approaches like storing JSON as a string or using ClickHouse's experimental JSON data type offer flexibility but come with drawbacks such as slower query performance and potential issues with file naming. The "JSON as pairwise arrays" approach provides better scalability for handling arbitrary numbers of JSON keys but requires more complex storage and querying mechanisms. Ultimately, the choice of approach depends on the level of structure in the JSON data being stored.