> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.getunleash.io/api/get-all-feature-types/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.getunleash.io/_mcp/server.

# Get all feature types

GET https://app.unleash-instance.example.com/api/admin/feature-types

Retrieves all feature types that exist in this Unleash instance, along with their descriptions and lifetimes.

Reference: https://docs.getunleash.io/api/get-all-feature-types

## Authentication

- `Authorization` header (required) — API key needed to access this API
- `Authorization` header (bearer token, required) — API key needed to access this API, in Bearer token format

## Response

### 200

featureTypesSchema

- `version` (enum, required) — The schema version used to describe the feature flag types listed in the `types` property.
  - Allowed values: `1`
- `types` (list of featureTypeSchema, required) — The list of feature flag types.

## Errors

### 401 Unauthorized Error

Authorization information is missing or invalid. Provide a valid API token as the `authorization` header, e.g. `authorization:*.*.my-admin-token`.

- `id` (string, optional) — The ID of the error instance
- `name` (string, optional) — The name of the error kind
- `message` (string, optional) — A description of what went wrong.

## Types

### featureTypeSchema

A [feature flag type](https://docs.getunleash.io/concepts/feature-flags#feature-flag-types).

- `id` (string, required) — The identifier of this feature flag type.
- `name` (string, required) — The display name of this feature flag type.
- `description` (string, required) — A description of what this feature flag type is intended to be used for.
- `lifetimeDays` (integer, required, nullable) — How many days it takes before a feature flag of this typed is flagged as [potentially stale](https://docs.getunleash.io/concepts/technical-debt#stale-and-potentially-stale-toggles) by Unleash. If this value is `null`, Unleash will never mark it as potentially stale.

## Examples

**Response**

```json
{
  "version": 1,
  "types": [
    {
      "id": "release",
      "name": "Release",
      "description": "Release feature flags are used to release new features.",
      "lifetimeDays": 40
    },
    {
      "id": "experiment",
      "name": "Experiment",
      "description": "Experiment feature flags are used to test and verify multiple different versions of a feature.",
      "lifetimeDays": 40
    },
    {
      "id": "operational",
      "name": "Operational",
      "description": "Operational feature flags are used to control aspects of a rollout.",
      "lifetimeDays": 7
    },
    {
      "id": "kill-switch",
      "name": "Kill switch",
      "description": "Kill switch feature flags are used to quickly turn on or off critical functionality in your system.",
      "lifetimeDays": null
    },
    {
      "id": "permission",
      "name": "Permission",
      "description": "Permission feature flags are used to control permissions in your system.",
      "lifetimeDays": null
    }
  ]
}
```

**SDK Code**

```python
import requests

url = "https://app.unleash-instance.example.com/api/admin/feature-types"

headers = {"Authorization": "<apiKey>"}

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

print(response.json())
```

```javascript
const url = 'https://app.unleash-instance.example.com/api/admin/feature-types';
const options = {method: 'GET', headers: {Authorization: '<apiKey>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

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

func main() {

	url := "https://app.unleash-instance.example.com/api/admin/feature-types"

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

	req.Header.Add("Authorization", "<apiKey>")

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

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

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

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://app.unleash-instance.example.com/api/admin/feature-types")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Authorization"] = '<apiKey>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://app.unleash-instance.example.com/api/admin/feature-types")
  .header("Authorization", "<apiKey>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://app.unleash-instance.example.com/api/admin/feature-types', [
  'headers' => [
    'Authorization' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://app.unleash-instance.example.com/api/admin/feature-types");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "<apiKey>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Authorization": "<apiKey>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://app.unleash-instance.example.com/api/admin/feature-types")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```