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# Domains

Domains are named groupings that organise [model objects](/core-concepts/model-objects) into bounded contexts. They map closely to the

Domain-Driven Design (DDD)

.

---

## What a domain is

Every model object in a version belongs to exactly one domain. Domains provide a way to segment a large architecture either by business unit (e.g., `Payments`) or by team ownership (e.g., `platform`).

---

## Creating domains

Create a domain in a version:

### Request

POST [https://api.icepanel.io/v1/landscapes/\{landscapeId}/versions/\{versionId}/domains](https://api.icepanel.io/v1/landscapes/\{landscapeId}/versions/\{versionId}/domains)

```curl
curl -X POST https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/domains \
     -H "X-API-Key: <apiKey>" \
     -H "Content-Type: application/json" \
     -d '{
  "name": "string"
}'
```

```typescript
import { IcePanelClient } from "@icepanel/sdk";

async function main() {
    const client = new IcePanelClient({
        apiKey: "YOUR_API_KEY_HERE",
    });
    await client.domains.create({
        landscapeId: "landscapeId",
        versionId: "versionId",
        body: {
            name: "string",
        },
    });
}
main();

```

```java
package com.example.usage;

import com.icepanel.IcePanelClient;
import com.icepanel.types.DomainCreateRequest;
import com.icepanel.types.DomainRequired;

public class Example {
    public static void main(String[] args) {
        IcePanelClient client = IcePanelClient
            .builder()
            .apiKey("YOUR_API_KEY_HERE")
            .build();

        client.domains().create(
            DomainCreateRequest
                .builder()
                .landscapeId("landscapeId")
                .versionId("versionId")
                .body(
                    DomainRequired
                        .builder()
                        .name("string")
                        .build()
                )
                .build()
        );
    }
}
```

```python
import requests

url = "https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/domains"

payload = { "name": "string" }
headers = {
    "X-API-Key": "<apiKey>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```go
package main

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

func main() {

	url := "https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/domains"

	payload := strings.NewReader("{\n  \"name\": \"string\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<apiKey>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```csharp
using RestSharp;

var client = new RestClient("https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/domains");
var request = new RestRequest(Method.POST);
request.AddHeader("X-API-Key", "<apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"name\": \"string\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

---

## Filtering model objects by domain

Use the `GET` endpoint with query parameter `?filter[domainId]={domainId}` to filter objects.

### Request

GET [https://api.icepanel.io/v1/landscapes/\{landscapeId}/versions/\{versionId}/model/objects](https://api.icepanel.io/v1/landscapes/\{landscapeId}/versions/\{versionId}/model/objects)

```curl
curl https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/model/objects \
     -H "X-API-Key: <apiKey>"
```

```typescript
import { IcePanelClient } from "@icepanel/sdk";

async function main() {
    const client = new IcePanelClient({
        apiKey: "YOUR_API_KEY_HERE",
    });
    await client.model.objects.list({
        landscapeId: "landscapeId",
        versionId: "versionId",
    });
}
main();

```

```java
package com.example.usage;

import com.icepanel.IcePanelClient;
import com.icepanel.model.types.ModelObjectsListRequest;

public class Example {
    public static void main(String[] args) {
        IcePanelClient client = IcePanelClient
            .builder()
            .apiKey("YOUR_API_KEY_HERE")
            .build();

        client.model().objects().list(
            ModelObjectsListRequest
                .builder()
                .landscapeId("landscapeId")
                .versionId("versionId")
                .build()
        );
    }
}
```

```python
import requests

url = "https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/model/objects"

headers = {"X-API-Key": "<apiKey>"}

response = requests.get(url, headers=headers)

print(response.json())
```

```go
package main

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

func main() {

	url := "https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/model/objects"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-API-Key", "<apiKey>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```csharp
using RestSharp;

var client = new RestClient("https://api.icepanel.io/v1/landscapes/landscapeId/versions/versionId/model/objects");
var request = new RestRequest(Method.GET);
request.AddHeader("X-API-Key", "<apiKey>");
IRestResponse response = client.Execute(request);
```

This is useful for extracting a bounded-context slice of the architecture for reports or external tools.

---

## Related concepts

* [Model Objects](/core-concepts/model-objects)
* [Model Connections](/core-concepts/model-connections)