# jsonextractkey

Extracts all matched JSON field keys based on 'jsonPath' into a STRING\_ARRAY.

{% hint style="warning" %}
***paramString*** option support is available from Pinot 1.5.0 release or try the latest code.
{% endhint %}

## Signature

> JSONEXTRACTKEY(jsonField, 'jsonPath', \[paramString])

| Arguments       | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `jsonField`     | An **Identifier**/**Expression** contains JSON documents.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| `'jsonPath'`    | Follows [JsonPath Syntax](https://goessner.net/articles/JsonPath/) to read values from JSON documents.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| `'paramString'` | <p>Parameter-based configuration for advanced options using semicolon-delimited key-value pairs.</p><ul><li><p>MAXDEPTH: Controls maximum extraction depth to prevent overly deep traversals</p><ul><li>Example: jsonExtractKey(json, '$..**', 'MAXDEPTH=2') - Extract keys up to 2 levels deep</li><li>Default: Unlimited depth (Integer.MAX\_VALUE)</li><li>Non-positive values treated as unlimited</li></ul></li><li><p>DOTNOTATION: Toggle between JsonPath and dot notation output formats</p><ul><li>Example: jsonExtractKey(json, '$..**', 'DOTNOTATION=true')</li><li>JsonPath format: $\['a']\['b']\['c']</li><li>Dot notation: a.b.c</li><li>Default: false (JsonPath format)</li></ul></li></ul> |

{% hint style="warning" %}
**`'jsonPath'`**\` is a literal. Pinot uses single quotes to distinguish them from **identifiers**.
{% endhint %}

## Usage Examples

The examples in this section are based on the [Batch JSON Quick Start](/release-1.4.0/basics/getting-started/quick-start.md#batch-json). In particular we'll be querying the row `WHERE id = 7044874109`.

```sql
select id, repo, JSONEXTRACTKEY(repo, '$.*') AS keys
from githubEvents 
WHERE id = 7044874109
```

| id         | repo                                                                                             | keys                                   |
| ---------- | ------------------------------------------------------------------------------------------------ | -------------------------------------- |
| 7044874109 | {"id":115911530,"name":"LimeVista/Tapes","url":"<https://api.github.com/repos/LimeVista/Tapes"}> | `["$['id']", "$['name']", "$['url']"]` |

```sql
select id, repo, JSONEXTRACTKEY(repo, '$.*', 'dotNotation=true') AS keys
from githubEvents 
WHERE id = 7044874109
```

| id         | repo                                                                                             | keys                    |
| ---------- | ------------------------------------------------------------------------------------------------ | ----------------------- |
| 7044874109 | {"id":115911530,"name":"LimeVista/Tapes","url":"<https://api.github.com/repos/LimeVista/Tapes"}> | `["id", "name", "url"]` |

More examples

```sql
-- Basic key extraction (existing functionality)
SELECT jsonExtractKey(repo, '$.*') FROM table

-- Extract keys with depth limit
SELECT jsonExtractKey(repo, '$..**', 'MAXDEPTH=2') FROM table

-- Extract keys in dot notation format
SELECT jsonExtractKey(repo, '$..**', 'DOTNOTATION=true') FROM table

-- Combined parameters
SELECT jsonExtractKey(repo, '$..**', 'MAXDEPTH=3;DOTNOTATION=true') FROM table
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.pinot.apache.org/release-1.4.0/functions-1/jsonextractkey.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.