JSONAsObject

Documentation for the JSONAsObject format

Description

In this format, a single JSON object is interpreted as a single JSON value. If the input has several JSON objects (comma separated), they are interpreted as separate rows. If the input data is enclosed in [], it is interpreted as an array of JSONs.

This format can only be parsed for a table with a single field of type JSON. The remaining columns must be set to DEFAULT or MATERIALIZED.

Example usage

Basic example

Query

CREATE TABLE json_as_object (json JSON) ENGINE = Memory;
INSERT INTO json_as_object (json) FORMAT JSONAsObject {"foo":{"bar":{"x":"y"},"baz":1}},{},{"any json stucture":1}
SELECT * FROM json_as_object FORMAT JSONEachRow;

Response

{"json":{"foo":{"bar":{"x":"y"},"baz":"1"}}}
{"json":{}}
{"json":{"any json stucture":"1"}}

An array of JSON objects

Query

CREATE TABLE json_square_brackets (field JSON) ENGINE = Memory;
INSERT INTO json_square_brackets FORMAT JSONAsObject [{"id": 1, "name": "name1"}, {"id": 2, "name": "name2"}];
SELECT * FROM json_square_brackets FORMAT JSONEachRow;

Response

{"field":{"id":"1","name":"name1"}}
{"field":{"id":"2","name":"name2"}}

Columns with default values

Query

CREATE TABLE json_as_object (json JSON, time DateTime MATERIALIZED now()) ENGINE = Memory;
INSERT INTO json_as_object (json) FORMAT JSONAsObject {"foo":{"bar":{"x":"y"},"baz":1}};
INSERT INTO json_as_object (json) FORMAT JSONAsObject {};
INSERT INTO json_as_object (json) FORMAT JSONAsObject {"any json stucture":1}
SELECT time, json FROM json_as_object FORMAT JSONEachRow

Response

{"time":"2024-09-16 12:18:10","json":{}}
{"time":"2024-09-16 12:18:13","json":{"any json stucture":"1"}}
{"time":"2024-09-16 12:18:08","json":{"foo":{"bar":{"x":"y"},"baz":"1"}}}

Format settings