[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [orderBy](./firestore_.orderby.md) ## orderBy() function Creates a `QueryConstraint` that sorts the query result by the specified field, optionally in descending order instead of ascending. Signature: ```typescript export declare function orderBy(fieldPath: string | FieldPath, directionStr?: OrderByDirection): QueryConstraint; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | fieldPath | string \| [FieldPath](./firestore_.fieldpath.md) | The field to sort by. | | directionStr | [OrderByDirection](./firestore_.orderbydirection.md) | Optional direction to sort by ('asc' or 'desc'). If not specified, order will be ascending. | Returns: [QueryConstraint](./firestore_.queryconstraint.md) The created `Query`.