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> Documentation for the JSONAsObject format

# JSONAsObject

<h2 id="description">
  Description
</h2>

In this format, a single JSON object is interpreted as a single [JSON](/reference/data-types/newjson) 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](/reference/data-types/newjson). The remaining columns must be set to [`DEFAULT`](/reference/statements/create/table#default) or [`MATERIALIZED`](/reference/statements/create/view#materialized-view).

<h2 id="example-usage">
  Example usage
</h2>

<h3 id="basic-example">
  Basic example
</h3>

```sql title="Query" theme={null}
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 title="Response" theme={null}
{"json":{"foo":{"bar":{"x":"y"},"baz":"1"}}}
{"json":{}}
{"json":{"any json stucture":"1"}}
```

<h3 id="an-array-of-json-objects">
  An array of JSON objects
</h3>

```sql title="Query" theme={null}
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 title="Response" theme={null}
{"field":{"id":"1","name":"name1"}}
{"field":{"id":"2","name":"name2"}}
```

<h3 id="columns-with-default-values">
  Columns with default values
</h3>

```sql title="Query" theme={null}
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 title="Response" theme={null}
{"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"}}}
```

<h2 id="format-settings">
  Format settings
</h2>