# read_json — DuckDB 1.3.2

No description supplied by the engine.

- Reference: /products/haybarn/functions/releases/duckdb-1.3.2/read_json/
- JSON: /products/haybarn/functions/api/v1/duckdb-1.3.2/functions/read_json.json
- Snapshot ID: duckdb-1.3.2
- Engine: duckdb v1.3.2
- Source ID: 0b83e5d2f6
- Binary SHA-256: 9a2ae2a4d5dbd07a5b0cb30c502d65014825d34924c681eb3faa7647e7cd2b6f
- Captured: 2026-09-05T18:37:33.818Z
- Source: https://github.com/duckdb/duckdb/releases/tag/v1.3.2
- Loaded extensions: autocomplete, core_functions, icu, json, parquet, shell

## Interpretation

- Choose a snapshot matching the target engine and build. The default is captured from the published Haybarn WASM package used by the browser playground. Historical native snapshots are also available.
- Availability is an observation in the recorded build and extension profile, not a guarantee of support in every installation or in WASM.
- Types and descriptions are declarations from duckdb_functions(). Binding can specialize result types. Null means not supplied by the catalog; do not invent defaults, optionality, argument mode, or table output columns.
- Raw parameter arrays preserve catalog order for scalar/aggregate/macro functions. Raw table arguments are alphabetical. Use callingConvention for engine-confirmed positional order and named arguments; null modes are unrecorded. Named does not mean optional. Macro defaults and special named variadic behavior are not supplied by duckdb_functions().
- Catalog examples are source material and may require data or extensions. runnableExamples contains separately verified SQL for the pinned WASM package; sample-data adaptations and guide examples are labeled separately.
- Guide annotations and recipes are separate editorial content. The browser runner always uses Haybarn WASM 1.5.5-rc3, independently of the documentation snapshot.
- All URLs beginning with / are relative to the origin hosting this document. Exports require no JavaScript, cookies, API key, or browser engine.

## Overloads

### overload-8a8f39fa370abfef

Kind: table. Parameter order: alphabetical-not-call-order.

```text
read_json(col0: VARCHAR, auto_detect := BOOLEAN, columns := ANY, compression := VARCHAR, convert_strings_to_integers := BOOLEAN, date_format := VARCHAR, dateformat := VARCHAR, field_appearance_threshold := DOUBLE, filename := ANY, format := VARCHAR, hive_partitioning := BOOLEAN, hive_types := ANY, hive_types_autocast := BOOLEAN, ignore_errors := BOOLEAN, map_inference_threshold := BIGINT, maximum_depth := BIGINT, maximum_object_size := UINTEGER, maximum_sample_files := BIGINT, records := VARCHAR, sample_size := BIGINT, timestamp_format := VARCHAR, timestampformat := VARCHAR, union_by_name := BOOLEAN) → TABLE
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/read_json/#overload-8a8f39fa370abfef

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| auto_detect | BOOLEAN | named |
| col0 | VARCHAR | positional (position 1) |
| columns | ANY | named |
| compression | VARCHAR | named |
| convert_strings_to_integers | BOOLEAN | named |
| date_format | VARCHAR | named |
| dateformat | VARCHAR | named |
| field_appearance_threshold | DOUBLE | named |
| filename | ANY | named |
| format | VARCHAR | named |
| hive_partitioning | BOOLEAN | named |
| hive_types | ANY | named |
| hive_types_autocast | BOOLEAN | named |
| ignore_errors | BOOLEAN | named |
| map_inference_threshold | BIGINT | named |
| maximum_depth | BIGINT | named |
| maximum_object_size | UINTEGER | named |
| maximum_sample_files | BIGINT | named |
| records | VARCHAR | named |
| sample_size | BIGINT | named |
| timestamp_format | VARCHAR | named |
| timestampformat | VARCHAR | named |
| union_by_name | BOOLEAN | named |

Declared return type: unknown. Variadic argument type: none declared.
Stability: unknown. Declared side effects: unknown.

### overload-85d88293d0aa836f

Kind: table. Parameter order: alphabetical-not-call-order.

```text
read_json(col0: VARCHAR[], auto_detect := BOOLEAN, columns := ANY, compression := VARCHAR, convert_strings_to_integers := BOOLEAN, date_format := VARCHAR, dateformat := VARCHAR, field_appearance_threshold := DOUBLE, filename := ANY, format := VARCHAR, hive_partitioning := BOOLEAN, hive_types := ANY, hive_types_autocast := BOOLEAN, ignore_errors := BOOLEAN, map_inference_threshold := BIGINT, maximum_depth := BIGINT, maximum_object_size := UINTEGER, maximum_sample_files := BIGINT, records := VARCHAR, sample_size := BIGINT, timestamp_format := VARCHAR, timestampformat := VARCHAR, union_by_name := BOOLEAN) → TABLE
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/read_json/#overload-85d88293d0aa836f

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| auto_detect | BOOLEAN | named |
| col0 | VARCHAR[] | positional (position 1) |
| columns | ANY | named |
| compression | VARCHAR | named |
| convert_strings_to_integers | BOOLEAN | named |
| date_format | VARCHAR | named |
| dateformat | VARCHAR | named |
| field_appearance_threshold | DOUBLE | named |
| filename | ANY | named |
| format | VARCHAR | named |
| hive_partitioning | BOOLEAN | named |
| hive_types | ANY | named |
| hive_types_autocast | BOOLEAN | named |
| ignore_errors | BOOLEAN | named |
| map_inference_threshold | BIGINT | named |
| maximum_depth | BIGINT | named |
| maximum_object_size | UINTEGER | named |
| maximum_sample_files | BIGINT | named |
| records | VARCHAR | named |
| sample_size | BIGINT | named |
| timestamp_format | VARCHAR | named |
| timestampformat | VARCHAR | named |
| union_by_name | BOOLEAN | named |

Declared return type: unknown. Variadic argument type: none declared.
Stability: unknown. Declared side effects: unknown.


## Guide recipes

No guide recipes.

## Engine catalog examples

Source examples may require additional data or extensions. Expressions are wrapped in SELECT; execution verification is not recorded.

No catalog examples.

## Runnable examples

Executed successfully in Haybarn WASM 1.5.5-rc3. Sample data and guide examples are separate from the original catalog.

```sql
COPY (SELECT 'apples' AS fruit, 12 AS quantity)
TO 'harvest.json' (FORMAT JSON);

SELECT * FROM read_json('harvest.json');
```

## Additional DuckDB documentation

- [JSON Processing Functions](https://duckdb.org/docs/current/data/json/json_functions)
- [JSON Format Settings](https://duckdb.org/docs/current/data/json/format_settings#format-newline_delimited)
- [Loading JSON](https://duckdb.org/docs/current/data/json/loading_json#the-read_json-function)

## Observed availability

| Snapshot | Observed | Overloads | JSON |
| --- | --- | --- | --- |
| haybarn-1.5.5-rc3 | present | 2 | [reference](/products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/read_json.json) |
| duckdb-1.5.5 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/read_json.json) |
| duckdb-1.4.4 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/read_json.json) |
| duckdb-1.3.2 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/read_json.json) |

Engine catalog documentation is derived from MIT-licensed Haybarn and DuckDB. [Notices](/third-party-notices.txt).