---
title: Extract JSON from Text
sidebarTitle: Extract JSON
---

## Extract JSON Values from JSON Data

The `json_extract()` function extracts values from the JSON data passed as its argument.

To show how it works, we use the [home rentals example](/sql/tutorials/home-rentals). The model returns the predicted value and the explanation of the prediction in the form of JSON data.

```sql
SELECT rental_price, rental_price_explain
FROM mindsdb.home_rentals_model
WHERE sqft = 823
AND location='good'
AND neighborhood='downtown'
AND days_on_market=10;
```

On execution, we get:

```sql
+--------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
| rental_price | rental_price_explain                                                                                                                          |
+--------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
| 1580         | {"predicted_value": 1580, "confidence": 0.99, "anomaly": null, "truth": null, "confidence_lower_bound": 1490, "confidence_upper_bound": 1670} |
+--------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
```

Now, if we want to see the `confidence` value only, we can use the `json_extract()` function as below.

```sql
SELECT rental_price, json_extract(rental_price_explain, '$.confidence') AS confidence
FROM mindsdb.home_rentals_model
WHERE sqft = 823
AND location='good'
AND neighborhood='downtown'
AND days_on_market=10;
```

On execution, we get:

```sql
+--------------+------------+
| rental_price | confidence |
+--------------+------------+
| 1580         | 0.99       |
+--------------+------------+
```

## Extract JSON from Text Data

In this example, we use the OpenAI model to extract data in a predefined JSON format from the input text data.

<Info>
**Default Model**

When you create an OpenAI model in MindsDB, it uses the `gpt-3.5-turbo` model by default. But you can use the `gpt-4` model as well by passing it to the `model-name` parameter.
</Info>

Let's create an OpenAI model.

<Tabs>
    <Tab title="SQL">
    Before creating an OpenAI model, please create an engine, providing your OpenAI API key:

    ```sql
    CREATE ML_ENGINE openai_engine
    FROM openai
    USING
        openai_api_key = 'your-openai-api-key';
    ```
    ```sql
    CREATE MODEL mindsdb.nlp_model
    PREDICT json
    USING
        engine = 'openai_engine',
        json_struct = {
            'rental_price': 'rental price',
            'location': 'location',
            'nob': 'number of bathrooms'
        },
        prompt_template = '{{sentence}}';
    ```
    </Tab>
</Tabs>

We pass three parameters as follows:

1. The `engine` parameter ensures we use the OpenAI engine.
2. The `json_struct` parameter stores a predefined JSON structure used for the output.
3. The `prompt_template` parameter contains the instruction passed to the model that may include variables such as `{{sentence}}`.

Now we can query the model, passing the input text stored in the `sentence` column.

<Tabs>
    <Tab title="SQL">
    ```sql
    SELECT json
    FROM mindsdb.nlp_model
    WHERE sentence = 'Amazing 3 bedroom apartment located at the heart of Manhattan, has one full bathrooms and one toilet room for just 3000 a month.';
    ```

    On execution, we get:

    ```sql
    +----------------------------------------------------------+
    | json                                                     |
    +----------------------------------------------------------+
    | {"location":"Manhattan","nob":"1","rental_price":"3000"} |
    +----------------------------------------------------------+
    ```
    </Tab>
</Tabs>
