Exploring ClickHouse’s Multiple Approaches to JSON Processing

ClickHouse offers several methods for handling JSON data, each with its own advantages, disadvantages, and suitable scenarios.

Loading JSON – How to load and query JSON (especially NDJSON) data in ClickHouse using a simple schema. References: https://clickhouse.com/docs/en/integrations/data-formats/json/loading and https://github.com/ndjson/ndjson-spec

JSON schema inference – Using JSON schema inference to query JSON data and create table schemas. Reference: https://clickhouse.com/docs/en/integrations/data-formats/json/inference

Designing JSON schema – Steps to design and optimize a JSON schema. Reference: https://clickhouse.com/docs/en/integrations/data-formats/json/schema

Exporting JSON – How to export JSON data. Reference: https://clickhouse.com/docs/en/integrations/data-formats/json/exporting

Handling other JSON formats – Tips for processing JSON formats other than NDJSON. Reference: https://clickhouse.com/docs/en/integrations/data-formats/json/other-formats

Advanced JSON modeling approaches – Advanced methods that are not recommended for general use. Reference: https://clickhouse.com/docs/en/integrations/data-formats/json/other-approaches

Important note: a new JSON type is coming soon. This guide covers existing JSON handling techniques. A new JSON type is under active development and will replace the deprecated Object Data Type (alias JSON ). Track progress via the GitHub issue linked below.

https://github.com/ClickHouse/ClickHouse/issues/54864

https://clickhouse.com/docs/en/sql-reference/data-types/object-data-type