# Cancel campaign

> POST /campaigns/:id/cancel — cancel a scheduled campaign and return it to draft.

`POST /campaigns/:id/cancel`

Cancels a **scheduled** campaign: the pending delivery is dropped and the campaign returns to the `draft` status, so you can edit it and send or schedule it again. Only a `scheduled` campaign can be canceled. Returns the updated campaign object.

**Path parameters**

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `id` | string | Yes | The campaign ID. |

**Node.js**

```js
import { MailBlastr } from 'mailblastr';

const mb = new MailBlastr('mb_xxxxxxxxx');

const { data, error } = await mb.campaigns.cancel('8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90');
console.log({ data, error });
```

**Ruby**

```ruby
require "mailblastr"

Mailblastr.api_key = "mb_xxxxxxxxx"

Mailblastr::Campaigns.cancel("8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90")
```

**PHP**

```php
$mailblastr = Mailblastr::client('mb_xxxxxxxxx');

$mailblastr->campaigns->cancel('8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90');
```

**Python**

```python
import mailblastr

mailblastr.api_key = "mb_xxxxxxxxx"

mailblastr.Campaigns.cancel("8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90")
```

**Go**

```go
package main

import (
    "fmt"
    "io"
    "net/http"
)

func main() {
    req, _ := http.NewRequest("POST", "https://api.mailblastr.com/campaigns/8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90/cancel", nil)
    req.Header.Set("Authorization", "Bearer mb_xxxxxxxxx")
    res, _ := http.DefaultClient.Do(req)
    defer res.Body.Close()
    out, _ := io.ReadAll(res.Body)
    fmt.Println(string(out))
}
```

**Rust**

```rust
use reqwest::Client;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let res = Client::new()
        .post("https://api.mailblastr.com/campaigns/8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90/cancel")
        .header("Authorization", "Bearer mb_xxxxxxxxx")
        .send()
        .await?;
    println!("{}", res.text().await?);
    Ok(())
}
```

**Java**

```java
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

var client = HttpClient.newHttpClient();
var request = HttpRequest.newBuilder()
    .uri(URI.create("https://api.mailblastr.com/campaigns/8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90/cancel"))
    .header("Authorization", "Bearer mb_xxxxxxxxx")
    .method("POST", HttpRequest.BodyPublishers.noBody())
    .build();
var response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
```

**.NET**

```csharp
using System.Net.Http;
using System.Text;

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.mailblastr.com/campaigns/8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90/cancel");
request.Headers.Add("Authorization", "Bearer mb_xxxxxxxxx");
var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());
```

**cURL**

```bash
curl -X POST 'https://api.mailblastr.com/campaigns/8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90/cancel' \
  -H 'Authorization: Bearer mb_xxxxxxxxx'
```

**CLI**

```bash
mailblastr campaigns cancel 8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90
```

### Response

```json
{
  "object": "campaign",
  "id": "8f5c2a1e-7b3d-4f9a-9c12-2e6d4a7b8c90",
  "name": "June newsletter",
  "audience_id": "aud_3b1c...",
  "segment_id": null,
  "topic_id": null,
  "from": "Acme <news@yourdomain.com>",
  "subject": "What's new in June",
  "html": "<p>Hi {{FIRST_NAME}}!</p>",
  "text": "Hi {{FIRST_NAME}}!",
  "reply_to": null,
  "preview_text": null,
  "status": "draft",
  "scheduled_at": null,
  "sent_at": null,
  "created_at": "2026-06-23T10:00:00.000Z",
  "ab_test": { "enabled": false },
  "recurrence": null,
  "parent_campaign_id": null
}
```

> **Note:** Errors: `not_found` if the campaign does not exist or is not yours; `validation_error` if it is not in the `scheduled` status.