@loopback/docs/site/apidocs/repository.defaultcrudrepository.execute_1.md

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---
lang: en
title: 'API docs: repository.defaultcrudrepository.execute_1'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.defaultcrudrepository.execute_1.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [DefaultCrudRepository](./repository.defaultcrudrepository.md) &gt; [execute](./repository.defaultcrudrepository.execute_1.md)

## DefaultCrudRepository.execute() method

Execute a MongoDB command.

\*\*WARNING:\*\* In general, it is always better to perform database actions through repository methods. Directly executing MongoDB commands may lead to unexpected results and other issues.

<b>Signature:</b>

```typescript
execute(collectionName: string, command: string, ...parameters: PositionalParameters): Promise<AnyObject>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  collectionName | string | The name of the collection to execute the command on. |
|  command | string | The command name. See \[Collection API docs\](http://mongodb.github.io/node-mongodb-native/3.6/api/Collection.html) for the list of commands supported by the MongoDB client. |
|  parameters | [PositionalParameters](./repository.positionalparameters.md) | Command parameters (arguments), as described in MongoDB API docs for individual collection methods. |

<b>Returns:</b>

Promise&lt;[AnyObject](./repository.anyobject.md)<!-- -->&gt;

A promise which resolves to the command output as returned by the database driver.

## Example


```ts
const result = await repo.execute('MyCollection', 'aggregate', [
  {$lookup: {
    // ...
  }},
  {$unwind: '$data'},
  {$out: 'tempData'}
]);
```