Evercookie

http://samy.pl/evercookie/
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Evercookie is a JavaScript API that produces extremely persistent cookies in browsers by storing...
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### Evercookie Example Output

Source: http://samy.pl/evercookie

This snippet shows the initial state of various storage mechanisms before an Evercookie is set, indicating which mechanisms are available and their current values.

```html

    
    pngData mechanism: undefined  
    etagData mechanism: undefined  
    cacheData mechanism: undefined  
    userData mechanism: undefined  
    cookieData mechanism: undefined  
    localData mechanism: null  
    globalData mechanism: undefined  
    sessionData mechanism: null  
    windowData mechanism: undefined  
    lsoData mechanism: undefined  
    slData mechanism: undefined  

    
```

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### Initialize and Set Evercookie

Source: http://samy.pl/evercookie

Include the library script and initialize the object to set a persistent cookie.

```html
<script type="text/javascript" src="evercookie.js"></script>
 
    <script>
    var ec = new evercookie();
    
    // set a cookie "id" to "12345"
    // usage: ec.set(key, value)
    ec.set("id", "12345");
```

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### Evercookie GitHub Repository

Source: http://samy.pl/evercookie

Find the latest details, code, and implementations for Evercookie on its official GitHub repository.

```text
https://github.com/samyk/evercookie
```

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### Retrieve Evercookie Values

Source: http://samy.pl/evercookie

Retrieve stored cookies using a simple callback or a detailed candidate analysis function.

```javascript
ec.get("id", function(value) { alert("Cookie value is " + value) });
 
    // or use a more advanced callback function for getting our cookie
    // the cookie value is the first param
    // an object containing the different storage methods
    // and returned cookie values is the second parameter
    function getCookie(best_candidate, all_candidates)
    {
        alert("The retrieved cookie is: " + best_candidate + "\n" +
        	"You can see what each storage mechanism returned " +
    		"by looping through the all_candidates object.");
 
    	for (var item in all_candidates)
    		document.write("Storage mechanism " + item +
    			" returned: " + all_candidates[item] + "<br>");
    }
    ec.get("id", getCookie);
    
    // we look for "candidates" based off the number of "cookies" that
    // come back matching since it's possible for mismatching cookies.
    // the best candidate is most likely the correct one
    </script>
```
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