[Home](./index.md) > [@essex/toolbox](./toolbox.md) > [EventEmitter](./toolbox.eventemitter.md) > [off](./toolbox.eventemitter.off.md) ## EventEmitter.off() method Removes an event listener for the given event Signature: ```typescript off(key: string, handler?: Handler): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | key | string | | | handler | Handler | (Optional) | Returns: void