# Extraction Rules

Using the **extract\_rules** parameter, you can get the scraped site based on various extraction rules.

Extraction rules can be applied with both JavaScript rendering enabled or disabled.

### Possible extraction rules

| Parameter | Required | Details                                                                                      |
| --------- | -------- | -------------------------------------------------------------------------------------------- |
| selector  | true     | The CSS selector.                                                                            |
| output    | false    | Choose between **html**, **text** or **@\[attr]**. Default value is **html**.                |
| all       | false    | Set this parameter to "**1**" to return all the HTML elements. The default value is "**0**". |

### Extraction Rules examples

> ```
> GET https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&extract_rules={"title": {"selector": "h1", "output": "text"}}
> ```

**⇡ Input**

{% tabs %}
{% tab title="cURL" %}

```
curl --request GET --url "https://scrape.shifter.io/v1?api_key=api_key&&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D"
```

{% endtab %}

{% tab title="NodeJS" %}

```javascript
const http = require("https");

const options = {
  "method": "GET",
  "hostname": "scrape.shifter.io",
  "port": null,
  "path": "/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D",
  "headers": {}
};

const req = http.request(options, function (res) {
  const chunks = [];

  res.on("data", function (chunk) {
    chunks.push(chunk);
  });

  res.on("end", function () {
    const body = Buffer.concat(chunks);
    console.log(body.toString());
  });
});

req.end();
```

{% endtab %}

{% tab title="Python" %}

```python
import http.client

conn = http.client.HTTPSConnection("scrape.shifter.io")

conn.request("GET", "/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D")

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
```

{% endtab %}

{% tab title="PHP" %}

```php
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://scrape.shifter.io/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
```

{% endtab %}

{% tab title="Golang" %}

```go
package main

import (
	"fmt"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://scrape.shifter.io/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D"

	req, _ := http.NewRequest("GET", url, nil)

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

{% endtab %}

{% tab title="Java" %}

```java
HttpResponse<String> response = Unirest.get("https://scrape.shifter.io/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D")
```

{% endtab %}

{% tab title=".NET" %}

```
var client = new RestClient("https://scrape.shifter.io/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D");
var request = new RestRequest(Method.GET);
IRestResponse response = client.Execute(request);
```

{% endtab %}

{% tab title="Ruby" %}

```ruby
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://scrape.shifter.io/v1?api_key=api_key&url=https%3A%2F%2Fexample.com&extract_rules=%7B%22title%22%3A%20%7B%22selector%22%3A%20%22h1%22%2C%20%22output%22%3A%20%22text%22%7D%7D")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Get.new(url)

response = http.request(request)
puts response.read_body
```

{% endtab %}
{% endtabs %}

**⇣ Output**

```
{"title": "Example Domain"}
```