# Connections

> Connections between steps in automation workflows.

## How it works

Connections are the code definitions for the links between [steps](https://www.mailblastr.com/docs/automations/steps) in the automation graph and are defined and retrieved using the API.

If creating an automation via the API, define connections as an array of objects.

**Node.js**

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

const mb = new MailBlastr('mb_xxxxxxxxx');

const { data, error } = await mb.automations.create({
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": { "event_name": "user.created" }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": { "id": "34a080c9-b17d-4187-ad80-5af20266e535" }
      }
    }
  ],
  "connections": [
    { "from": "start", "to": "welcome" }
  ]
});
console.log({ data, error });
```

**Ruby**

```ruby
require "mailblastr"

Mailblastr.api_key = "mb_xxxxxxxxx"

Mailblastr::Automations.create({
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": {
        "event_name": "user.created"
      }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": {
          "id": "34a080c9-b17d-4187-ad80-5af20266e535"
        }
      }
    }
  ],
  "connections": [
    {
      "from": "start",
      "to": "welcome"
    }
  ]
})
```

**PHP**

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

$mailblastr->automations->create([
  'name' => "Welcome series",
  'domain' => "yourdomain.com",
  'steps' => [
    [
      'key' => "start",
      'type' => "trigger",
      'config' => [
        'event_name' => "user.created"
      ]
    ],
    [
      'key' => "welcome",
      'type' => "send_email",
      'config' => [
        'template' => [
          'id' => "34a080c9-b17d-4187-ad80-5af20266e535"
        ]
      ]
    ]
  ],
  'connections' => [
    [
      'from' => "start",
      'to' => "welcome"
    ]
  ]
]);
```

**Python**

```python
import mailblastr

mailblastr.api_key = "mb_xxxxxxxxx"

mailblastr.Automations.create({
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": {
        "event_name": "user.created"
      }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": {
          "id": "34a080c9-b17d-4187-ad80-5af20266e535"
        }
      }
    }
  ],
  "connections": [
    {
      "from": "start",
      "to": "welcome"
    }
  ]
})
```

**Go**

```go
package main

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

func main() {
    req, _ := http.NewRequest("POST", "https://api.mailblastr.com/automations", strings.NewReader(`{
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": { "event_name": "user.created" }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": { "id": "34a080c9-b17d-4187-ad80-5af20266e535" }
      }
    }
  ],
  "connections": [
    { "from": "start", "to": "welcome" }
  ]
}`))
    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()
        .post("https://api.mailblastr.com/automations")
        .header("Authorization", "Bearer mb_xxxxxxxxx")
        .header("Content-Type", "application/json")
        .body(r#"{
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": { "event_name": "user.created" }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": { "id": "34a080c9-b17d-4187-ad80-5af20266e535" }
      }
    }
  ],
  "connections": [
    { "from": "start", "to": "welcome" }
  ]
}"#)
        .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/automations"))
    .header("Authorization", "Bearer mb_xxxxxxxxx")
    .header("Content-Type", "application/json")
    .method("POST", HttpRequest.BodyPublishers.ofString("""
{
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": { "event_name": "user.created" }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": { "id": "34a080c9-b17d-4187-ad80-5af20266e535" }
      }
    }
  ],
  "connections": [
    { "from": "start", "to": "welcome" }
  ]
}
"""))
    .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/automations");
request.Headers.Add("Authorization", "Bearer mb_xxxxxxxxx");
request.Content = new StringContent(@"{
  ""name"": ""Welcome series"",
  ""domain"": ""yourdomain.com"",
  ""steps"": [
    {
      ""key"": ""start"",
      ""type"": ""trigger"",
      ""config"": { ""event_name"": ""user.created"" }
    },
    {
      ""key"": ""welcome"",
      ""type"": ""send_email"",
      ""config"": {
        ""template"": { ""id"": ""34a080c9-b17d-4187-ad80-5af20266e535"" }
      }
    }
  ],
  ""connections"": [
    { ""from"": ""start"", ""to"": ""welcome"" }
  ]
}", Encoding.UTF8, "application/json");
var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());
```

**cURL**

```bash
curl -X POST 'https://api.mailblastr.com/automations' \
  -H 'Authorization: Bearer mb_xxxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
  "name": "Welcome series",
  "domain": "yourdomain.com",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": { "event_name": "user.created" }
    },
    {
      "key": "welcome",
      "type": "send_email",
      "config": {
        "template": { "id": "34a080c9-b17d-4187-ad80-5af20266e535" }
      }
    }
  ],
  "connections": [
    { "from": "start", "to": "welcome" }
  ]
}'
```

When retrieving automations, the API returns the connections as an array.

**Response**

```json
{
  "object": "automation",
  "id": "c9b16d4f-ba6c-4e2e-b044-6bf4404e57fd",
  "audience_id": "aud_3b1c...",
  "domain": "yourdomain.com",
  "name": "Welcome series",
  "trigger": "user.created",
  "status": "disabled",
  "created_at": "2026-10-01T12:00:00.000Z",
  "updated_at": "2026-10-01T12:00:00.000Z",
  "steps": [
    {
      "key": "start",
      "type": "trigger",
      "config": { "event_name": "user.created" }
    },
    {
      "id": "9a8b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d",
      "key": "welcome",
      "type": "send_email",
      "position": 0,
      "config": {
        "template": { "id": "34a080c9-b17d-4187-ad80-5af20266e535" }
      }
    }
  ],
  "connections": [
    {
      "from": "start",
      "to": "welcome",
      "type": "default"
    }
  ]
}
```

> **Note:** Connections must form an acyclic graph — cyclic graphs are rejected. Editing connections requires the automation to be **disabled**.

## Connection properties

Connections define the links between steps in the automation graph.

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `from` | string | Yes | This is the `key` of the origin step. |
| `to` | string | Yes | This is the `key` of the destination step. |
| `type` | string | No | The type of connection between the origin and destination steps. Most automations use the default connection type. Use a non-default `type` only when the origin step can branch to multiple destinations: for [wait_for_event](https://www.mailblastr.com/docs/automations/wait-for-event), use `event_received` or `timeout`; for [condition](https://www.mailblastr.com/docs/automations/condition), use `condition_met` or `condition_not_met`. Possible values: `default`, `condition_met`, `condition_not_met`, `timeout`, `event_received`. |

**Example**

```json
{
  "from": "start",
  "to": "welcome",
  "type": "default"
}
```