[Home](./index.md) > [@firebase/database](./database.md) > [Query](./database.query.md) > [equalTo](./database.query.equalto.md) ## Query.equalTo() method Signature: ```typescript equalTo(value: number | string | boolean | null, key?: string): Query; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | value | number \| string \| boolean \| null | | | key | string | | Returns: [Query](./database.query.md)