# readCookie

### `readCookie` Function

The `readCookie` function is used to **retrieve the value of a client-side first-party cookie** by its name.

#### Function Signature

```ts
this.readCookie(cookieName: string): string | null
```

#### Parameters

* **`cookieName`** (`string`, required):\
  The name of the cookie you want to read.

***

#### Return Value

* **If the cookie is found:** Returns the **cookie value** as a `string`.
* **If the cookie is not found:** Returns `null`.

***

#### Examples

**Example 1: Read an existing cookie**

```js
function() {
  var val = this.readCookie("JTS-RW");
  return val; // Value of the cookie
}
```

This example returns the value stored in the cookie named `JTS-RW`.

***

**Example 2: Read a non-existing cookie**

```js
function() {
  var val = this.readCookie("JTS-RW");
  return val; // null
}
```

This example attempts to read a cookie that does not exist. As a result, it returns `null`.