## Table of Contents

- [cacheKeyPRO](#cachekeypro)
  - [CLI Microlink API example](#cli-microlink-api-example)
  - [cURL Microlink API example](#curl-microlink-api-example)
  - [JavaScript Microlink API example](#javascript-microlink-api-example)
  - [Python Microlink API example](#python-microlink-api-example)
  - [Ruby Microlink API example](#ruby-microlink-api-example)
  - [PHP Microlink API example](#php-microlink-api-example)
  - [Golang Microlink API example](#golang-microlink-api-example)

---

[API](https://microlink.io/docs/api/getting-started/overview)

[GUIDES](https://microlink.io/docs/guides) [MQL](https://microlink.io/docs/mql/getting-started/overview) [SDK](https://microlink.io/docs/sdk/getting-started/overview) [CARDS](https://microlink.io/docs/cards/getting-started/overview)

API GUIDES MQL SDK CARDS

Getting Started

[Overview](https://microlink.io/docs/api/getting-started/overview)

[Data fields](https://microlink.io/docs/api/getting-started/data-fields)

[CLI](https://microlink.io/docs/api/getting-started/cli)

Basics

[Authentication](https://microlink.io/docs/api/basics/authentication)

[Cache](https://microlink.io/docs/api/basics/cache)

[Compression](https://microlink.io/docs/api/basics/compression)

[Endpoint](https://microlink.io/docs/api/basics/endpoint)

[Error codes](https://microlink.io/docs/api/basics/error-codes)

[Format](https://microlink.io/docs/api/basics/format)

[Rate limit](https://microlink.io/docs/api/basics/rate-limit)

Query Parameters

[adblock](https://microlink.io/docs/api/parameters/adblock)

[animations](https://microlink.io/docs/api/parameters/animations)

[audio](https://microlink.io/docs/api/parameters/audio)

[cacheKey](https://microlink.io/docs/api/parameters/cacheKey)

[click](https://microlink.io/docs/api/parameters/click)

[colorScheme](https://microlink.io/docs/api/parameters/colorScheme)

[data](https://microlink.io/docs/api/parameters/data)

[device](https://microlink.io/docs/api/parameters/device)

[embed](https://microlink.io/docs/api/parameters/embed)

[filename](https://microlink.io/docs/api/parameters/filename)

[filter](https://microlink.io/docs/api/parameters/filter)

[force](https://microlink.io/docs/api/parameters/force)

[function](https://microlink.io/docs/api/parameters/function)

[headers](https://microlink.io/docs/api/parameters/headers)

[iframe](https://microlink.io/docs/api/parameters/iframe)

[insights](https://microlink.io/docs/api/parameters/insights)

[lighthouse](https://microlink.io/docs/api/parameters/insights/lighthouse)

[technologies](https://microlink.io/docs/api/parameters/insights/technologies)

[javascript](https://microlink.io/docs/api/parameters/javascript)

[mediaType](https://microlink.io/docs/api/parameters/mediaType)

[meta](https://microlink.io/docs/api/parameters/meta)

[modules](https://microlink.io/docs/api/parameters/modules)

[palette](https://microlink.io/docs/api/parameters/palette)

[pdf](https://microlink.io/docs/api/parameters/pdf)

[format](https://microlink.io/docs/api/parameters/pdf/format)

[height](https://microlink.io/docs/api/parameters/pdf/height)

[landscape](https://microlink.io/docs/api/parameters/pdf/landscape)

[margin](https://microlink.io/docs/api/parameters/pdf/margin)

[pageRanges](https://microlink.io/docs/api/parameters/pdf/pageRanges)

[scale](https://microlink.io/docs/api/parameters/pdf/scale)

[width](https://microlink.io/docs/api/parameters/pdf/width)

[ping](https://microlink.io/docs/api/parameters/ping)

[prerender](https://microlink.io/docs/api/parameters/prerender)

[proxy](https://microlink.io/docs/api/parameters/proxy)

[retry](https://microlink.io/docs/api/parameters/retry)

[screenshot](https://microlink.io/docs/api/parameters/screenshot)

[codeScheme](https://microlink.io/docs/api/parameters/screenshot/codeScheme)

[element](https://microlink.io/docs/api/parameters/screenshot/element)

[fullPage](https://microlink.io/docs/api/parameters/screenshot/fullPage)

[overlay](https://microlink.io/docs/api/parameters/screenshot/overlay)

[omitBackground](https://microlink.io/docs/api/parameters/screenshot/omitBackground)

[type](https://microlink.io/docs/api/parameters/screenshot/type)

[scripts](https://microlink.io/docs/api/parameters/scripts)

[scroll](https://microlink.io/docs/api/parameters/scroll)

[styles](https://microlink.io/docs/api/parameters/styles)

[staleTtl](https://microlink.io/docs/api/parameters/staleTtl)

[timeout](https://microlink.io/docs/api/parameters/timeout)

[ttl](https://microlink.io/docs/api/parameters/ttl)

[url](https://microlink.io/docs/api/parameters/url)

[video](https://microlink.io/docs/api/parameters/video)

[viewport](https://microlink.io/docs/api/parameters/viewport)

[waitForSelector](https://microlink.io/docs/api/parameters/waitForSelector)

[waitForTimeout](https://microlink.io/docs/api/parameters/waitForTimeout)

[waitUntil](https://microlink.io/docs/api/parameters/waitUntil)

API GUIDES MQL SDK CARDS

Getting Started

[Overview](https://microlink.io/docs/api/getting-started/overview)

[Data fields](https://microlink.io/docs/api/getting-started/data-fields)

[CLI](https://microlink.io/docs/api/getting-started/cli)

Basics

[Authentication](https://microlink.io/docs/api/basics/authentication)

[Cache](https://microlink.io/docs/api/basics/cache)

[Compression](https://microlink.io/docs/api/basics/compression)

[Endpoint](https://microlink.io/docs/api/basics/endpoint)

[Error codes](https://microlink.io/docs/api/basics/error-codes)

[Format](https://microlink.io/docs/api/basics/format)

[Rate limit](https://microlink.io/docs/api/basics/rate-limit)

Query Parameters

[adblock](https://microlink.io/docs/api/parameters/adblock)

[animations](https://microlink.io/docs/api/parameters/animations)

[audio](https://microlink.io/docs/api/parameters/audio)

[cacheKey](https://microlink.io/docs/api/parameters/cacheKey)

[click](https://microlink.io/docs/api/parameters/click)

[colorScheme](https://microlink.io/docs/api/parameters/colorScheme)

[data](https://microlink.io/docs/api/parameters/data)

[device](https://microlink.io/docs/api/parameters/device)

[embed](https://microlink.io/docs/api/parameters/embed)

[filename](https://microlink.io/docs/api/parameters/filename)

[filter](https://microlink.io/docs/api/parameters/filter)

[force](https://microlink.io/docs/api/parameters/force)

[function](https://microlink.io/docs/api/parameters/function)

[headers](https://microlink.io/docs/api/parameters/headers)

[iframe](https://microlink.io/docs/api/parameters/iframe)

[insights](https://microlink.io/docs/api/parameters/insights)

[lighthouse](https://microlink.io/docs/api/parameters/insights/lighthouse)

[technologies](https://microlink.io/docs/api/parameters/insights/technologies)

[javascript](https://microlink.io/docs/api/parameters/javascript)

[mediaType](https://microlink.io/docs/api/parameters/mediaType)

[meta](https://microlink.io/docs/api/parameters/meta)

[modules](https://microlink.io/docs/api/parameters/modules)

[palette](https://microlink.io/docs/api/parameters/palette)

[pdf](https://microlink.io/docs/api/parameters/pdf)

[format](https://microlink.io/docs/api/parameters/pdf/format)

[height](https://microlink.io/docs/api/parameters/pdf/height)

[landscape](https://microlink.io/docs/api/parameters/pdf/landscape)

[margin](https://microlink.io/docs/api/parameters/pdf/margin)

[pageRanges](https://microlink.io/docs/api/parameters/pdf/pageRanges)

[scale](https://microlink.io/docs/api/parameters/pdf/scale)

[width](https://microlink.io/docs/api/parameters/pdf/width)

[ping](https://microlink.io/docs/api/parameters/ping)

[prerender](https://microlink.io/docs/api/parameters/prerender)

[proxy](https://microlink.io/docs/api/parameters/proxy)

[retry](https://microlink.io/docs/api/parameters/retry)

[screenshot](https://microlink.io/docs/api/parameters/screenshot)

[codeScheme](https://microlink.io/docs/api/parameters/screenshot/codeScheme)

[element](https://microlink.io/docs/api/parameters/screenshot/element)

[fullPage](https://microlink.io/docs/api/parameters/screenshot/fullPage)

[overlay](https://microlink.io/docs/api/parameters/screenshot/overlay)

[omitBackground](https://microlink.io/docs/api/parameters/screenshot/omitBackground)

[type](https://microlink.io/docs/api/parameters/screenshot/type)

[scripts](https://microlink.io/docs/api/parameters/scripts)

[scroll](https://microlink.io/docs/api/parameters/scroll)

[styles](https://microlink.io/docs/api/parameters/styles)

[staleTtl](https://microlink.io/docs/api/parameters/staleTtl)

[timeout](https://microlink.io/docs/api/parameters/timeout)

[ttl](https://microlink.io/docs/api/parameters/ttl)

[url](https://microlink.io/docs/api/parameters/url)

[video](https://microlink.io/docs/api/parameters/video)

[viewport](https://microlink.io/docs/api/parameters/viewport)

[waitForSelector](https://microlink.io/docs/api/parameters/waitForSelector)

[waitForTimeout](https://microlink.io/docs/api/parameters/waitForTimeout)

[waitUntil](https://microlink.io/docs/api/parameters/waitUntil)

## cacheKeyPRO

[Copy for LLM](https://microlink.io/docs/api/parameters/cacheKey.md "Copy content for LLM")

\|

[View as Markdown](https://microlink.io/docs/api/parameters/cacheKey.md "View content as Markdown")

Type: \<string\>\
Default: undefined

It extends the automatic [cache](https://microlink.io/docs/api/basics/cache) key with a custom identifier for the target [url](https://microlink.io/docs/api/parameters/url).

The following examples show how to use the Microlink API with CLI, cURL, JavaScript, Python, Ruby, PHP & Golang, targeting 'https://microlink.io' URL with 'screenshot' & 'cacheKey' API parameters:

### CLI Microlink API example

```bash
microlink https://microlink.io&screenshot&cacheKey=microlink-home
```

### cURL Microlink API example

```bash
curl -G "https://api.microlink.io" \
  -d "url=https://microlink.io" \
  -d "screenshot=true" \
  -d "cacheKey=microlink-home"
```

### JavaScript Microlink API example

```javascript
import mql from '@microlink/mql'

const { data } = await mql('https://microlink.io', {
  screenshot: true,
  cacheKey: "microlink-home"
})
```

### Python Microlink API example

```python
import requests

url = "https://api.microlink.io/"

querystring = {
    "url": "https://microlink.io",
    "screenshot": "true",
    "cacheKey": "microlink-home"
}

response = requests.get(url, params=querystring)

print(response.json())
```

### Ruby Microlink API example

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

base_url = "https://api.microlink.io/"

params = {
  url: "https://microlink.io",
  screenshot: "true",
  cacheKey: "microlink-home"
}

uri = URI(base_url)
uri.query = URI.encode_www_form(params)

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri)
response = http.request(request)

puts response.body
```

### PHP Microlink API example

```php
<?php

$baseUrl = "https://api.microlink.io/";

$params = [
    "url" => "https://microlink.io",
    "screenshot" => "true",
    "cacheKey" => "microlink-home"
];

$query = http_build_query($params);
$url = $baseUrl . '?' . $query;

$curl = curl_init();

curl_setopt_array($curl, [
    CURLOPT_URL => $url,
    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;
}
```

### Golang Microlink API example

```
package main

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

func main() {
    baseURL := "https://api.microlink.io"

    u, err := url.Parse(baseURL)
    if err != nil {
        panic(err)
    }
    q := u.Query()
    q.Set("url", "https://microlink.io")
    q.Set("screenshot", "true")
    q.Set("cacheKey", "microlink-home")
    u.RawQuery = q.Encode()

    req, err := http.NewRequest("GET", u.String(), nil)
    if err != nil {
        panic(err)
    }

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, err := io.ReadAll(resp.Body)
    if err != nil {
        panic(err)
    }

    fmt.Println(string(body))
}
```

```javascript
import mql from '@microlink/mql'

const { data } = await mql('https://microlink.io', {

  screenshot: true,

  cacheKey: "microlink-home"

})
```

CLI cURL JavaScript Python Ruby PHP Golang Click to run the code and see the API response

The [cache](https://microlink.io/docs/api/basics/cache) key is computed from the target URL and all recognized query parameters. The `cacheKey` value is appended on top, so two requests with the same parameters but different `cacheKey` values produce separate cache entries:

```bash
# Two separate cache entries despite identical parameters

https://pro.microlink.io?url=https://example.com&screenshot=true&cacheKey=variant-a

https://pro.microlink.io?url=https://example.com&screenshot=true&cacheKey=variant-b
```

This is useful when you need separate cached copies of the same request, for example when A/B testing or serving different audiences from the same URL.

You can verify the cache is working by checking the `x-cache-status` header on the response:

```
content-type    : application/json; charset=utf-8

x-response-time : 1.7s

x-pricing-plan  : pro

x-cache-ttl     : 86400000

x-request-id    : iad:2eb66538-0a16-4c56-b613-511d99507c9f

x-cache-status  : HIT

cache-control   : public, must-revalidate, max-age=0
```

You can read the [cache](https://microlink.io/docs/api/basics/cache) section to learn more.

Last updated on May 21, 2026

[Edit on GitHub](https://github.com/microlinkhq/www/blob/master/src/content/docs/api/parameters/cacheKey.md)