# Update topic

> PATCH /topics/:id — rename a topic or change its description.

`PATCH /topics/:id`

**Path parameters**

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `topic_id` | string | Yes | The topic ID. |

**Body parameters**

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `name` | string | No | New display name (max 255 chars). |
| `description` | string | No | New description shown on the preference page. |
| `visibility` | string | No | New visibility on the preference page: `public` or `private`. |

> **Warning:** The `default_subscription` (opt-in vs opt-out) is fixed at creation and **cannot be updated**.

**Node.js**

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

const mb = new MailBlastr('mb_xxxxxxxxx');

const { data, error } = await mb.topics.update('topic_9a2f...', { "name": "Newsletter" });
console.log({ data, error });
```

**Ruby**

```ruby
require "mailblastr"

Mailblastr.api_key = "mb_xxxxxxxxx"

Mailblastr::Topics.update("topic_9a2f...", {
  "name": "Newsletter"
})
```

**PHP**

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

$mailblastr->topics->update('topic_9a2f...', [
  'name' => "Newsletter"
]);
```

**Python**

```python
import mailblastr

mailblastr.api_key = "mb_xxxxxxxxx"

mailblastr.Topics.update("topic_9a2f...", {
  "name": "Newsletter"
})
```

**Go**

```go
package main

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

func main() {
    req, _ := http.NewRequest("PATCH", "https://api.mailblastr.com/topics/topic_9a2f...", strings.NewReader(`{ "name": "Newsletter" }`))
    req.Header.Set("Authorization", "Bearer mb_xxxxxxxxx")
    req.Header.Set("Content-Type", "application/json")
    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()
        .patch("https://api.mailblastr.com/topics/topic_9a2f...")
        .header("Authorization", "Bearer mb_xxxxxxxxx")
        .header("Content-Type", "application/json")
        .body(r#"{ "name": "Newsletter" }"#)
        .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/topic_9a2f..."))
    .header("Authorization", "Bearer mb_xxxxxxxxx")
    .header("Content-Type", "application/json")
    .method("PATCH", HttpRequest.BodyPublishers.ofString("""
{ "name": "Newsletter" }
"""))
    .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.Patch, "https://api.mailblastr.com/topics/topic_9a2f...");
request.Headers.Add("Authorization", "Bearer mb_xxxxxxxxx");
request.Content = new StringContent(@"{ ""name"": ""Newsletter"" }", Encoding.UTF8, "application/json");
var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());
```

**cURL**

```bash
curl -X PATCH 'https://api.mailblastr.com/topics/topic_9a2f...' \
  -H 'Authorization: Bearer mb_xxxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{ "name": "Newsletter" }'
```

**CLI**

```bash
mailblastr topics update topic_9a2f... \
  --name 'Newsletter'
```