# List topics

> GET /topics — list the topics on a sending domain.

`GET /topics`

Pass `?domain=` to pick the sending domain whose topics to list — the parameter is required.

**Query parameters**

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `domain` | string | Yes | The sending domain whose topics to list. |
| `limit` | number | No | Number of topics to retrieve. Optional; if omitted, all topics are returned in a single response. Minimum `1`, maximum `100`. |
| `after` | string | No | The topic ID *after* which to retrieve more topics (for pagination). The ID is not included in the result. Cannot be combined with `before`. |
| `before` | string | No | The topic ID *before* which to retrieve more topics (for pagination). The ID is not included in the result. Cannot be combined with `after`. |

**Node.js**

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

const mb = new MailBlastr('mb_xxxxxxxxx');

const { data, error } = await mb.topics.list({ domain: 'yourdomain.com' });
console.log({ data, error });
```

**Ruby**

```ruby
require "mailblastr"

Mailblastr.api_key = "mb_xxxxxxxxx"

Mailblastr::Topics.list({
  "domain": "yourdomain.com"
})
```

**PHP**

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

$mailblastr->topics->list([
  'domain' => "yourdomain.com"
]);
```

**Python**

```python
import mailblastr

mailblastr.api_key = "mb_xxxxxxxxx"

mailblastr.Topics.list({
  "domain": "yourdomain.com"
})
```

**Go**

```go
package main

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

func main() {
    req, _ := http.NewRequest("GET", "https://api.mailblastr.com/topics?domain=yourdomain.com", 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()
        .get("https://api.mailblastr.com/topics?domain=yourdomain.com")
        .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/topics?domain=yourdomain.com"))
    .header("Authorization", "Bearer mb_xxxxxxxxx")
    .method("GET", 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.Get, "https://api.mailblastr.com/topics?domain=yourdomain.com");
request.Headers.Add("Authorization", "Bearer mb_xxxxxxxxx");
var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());
```

**cURL**

```bash
curl -X GET 'https://api.mailblastr.com/topics?domain=yourdomain.com' \
  -H 'Authorization: Bearer mb_xxxxxxxxx'
```

**CLI**

```bash
mailblastr topics list \
  --domain yourdomain.com
```

### Response

```json
{
  "object": "list",
  "has_more": false,
  "data": [
    {
      "id": "topic_9a2f...",
      "name": "Product updates",
      "description": null,
      "default_subscription": "opt_in",
      "visibility": "private",
      "created_at": "2026-06-25T10:00:00.000Z"
    }
  ]
}
```