[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [MissingKeyError](./js-utils.missingkeyerror.md) ## MissingKeyError class Error indicating that a required key did not exist in a map-like. Signature: ```typescript export declare class MissingKeyError extends NotFoundError ``` Extends: [NotFoundError](./js-utils.notfounderror.md) ## Constructors | Constructor | Modifiers | Description | | --- | --- | --- | | [(constructor)(msg, nested)](./js-utils.missingkeyerror._constructor_.md) | | Constructs a new instance of the MissingKeyError class |