# How to bulk delete contacts
{% hint style="info" %}
Note: You will need to have data flows enabled for this in your workspace
{% endhint %}
This article covers how you can bulk delete contacts in Bird using a file upload.
* Go to **Settings > AI and Automation > Data flows.**
* Create a new data flow with following source and destination
1. **Source:** CSV Upload
2. **Destination:** Delete contact
* Once created, go to **Configuration > Source** (left-hand panel)
* you can upload a csv containing either email, phone or contact IDs to be deleted
* You can export contacts from a list or segment or the contacts page, and upload here in the data flow.
* Click on **Save Configuration** after upload
* Move to **Transformation** section and click on **Open transformation editor**
* Then, click on **JSONata** under Transformation
#### Adding JSONata
* You will need to add the following in JSONATA expression if your key identifier is phonenumber:
```jsonata
{
"identifierKey": "phonenumber",
"identifierValue": $.Phone
}
```
* If your key identifier is email, then use below
```
{
"identifierKey": "emailaddress",
"identifierValue": $.Email
}
```
* You can also delete contacts based on simply Contact ID irrespective of any identifier, in this case you would need to change the column name on csv to **Id** and use below:
```
{
"contactId": $.Id
}
```
Once done click on **Save.**
**Enable and Run the data flow**
* Click on **Enabled** and then click on **Run Now**
* You can **Edit data flow** to upload more files under Source and then again click on **Save configuration > Run Now**.
