[youtubei.js](../../../README.md) / [Parser](../README.md) / addRuntimeParser # Function: addRuntimeParser() > **addRuntimeParser**(`classname`, `ParserConstructor`): `void` ## Parameters • **classname**: `string` • **ParserConstructor**: [`YTNodeConstructor`](../../Helpers/interfaces/YTNodeConstructor.md)\<[`YTNode`](../../Helpers/classes/YTNode.md)\> ## Returns `void` ## Defined in [src/parser/parser.ts:218](https://github.com/LuanRT/YouTube.js/blob/af92984523f90200a18314b94478a2697c9deab0/src/parser/parser.ts#L218)