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

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[Home](./index.md) &gt; [@loopback/sequelize](./sequelize.md) &gt; [SequelizeDataSource](./sequelize.sequelizedatasource.md) &gt; [beginTransaction](./sequelize.sequelizedatasource.begintransaction.md)

## SequelizeDataSource.beginTransaction() method

Begin a new transaction.

**Signature:**

```typescript
beginTransaction(options?: TransactionOptions | TransactionOptions['isolationLevel']): Promise<Transaction>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  options | TransactionOptions \| TransactionOptions\['isolationLevel'\] | _(Optional)_ Options {<!-- -->isolationLevel: '...'<!-- -->} |

**Returns:**

Promise&lt;Transaction&gt;

A promise which resolves to a Sequelize Transaction object