With this function you can get a certain cookie that has been sent by the client. You specify the cookie you want to get using the key parameter. If the key parameter isn't a string it'll throw a TypeError and when the cookie wasn't found it'll return undefined.

This function returns if the client has sent the specified cookie. You can specify the cookie you want to check using the key parameter. If the key parameter isn't a string it'll throw a TypeError.

This function returns an array of the names of all the cookies that were sent by the client.