# Algorithm

## Overview

The `Algorithm` builder facilitates the creation of algorithm objects used for signing or verifying JWT tokens. It provides flexibility in configuring token headers, such as including a key identifier.

The `kid(kid)` method allows setting a key identifier, which will be included in the token header. The method takes a string representing the private key identifier as its parameter and returns the algorithm builder to enable method chaining.

## Methods Summarized

| Type                                                                     | Name                 | Summary                                                |
| ------------------------------------------------------------------------ | -------------------- | ------------------------------------------------------ |
| [Algorithm](/reference/servoyextensions/server-plugins/jwt/algorithm.md) | [kid(kid)](#kid-kid) | The key identifier, will be added to the token header. |

## Methods Detailed

### kid(kid)

The key identifier, will be added to the token header.

**Parameters**

* [String](/reference/servoycore/dev-api/js-lib/string.md) **kid** the private key identifier

**Returns:** [Algorithm](/reference/servoyextensions/server-plugins/jwt/algorithm.md) the algorithm builder for method chaining

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