# Function

Functions are JavaScript Node.js code that execute at a particular domain.

The steps to create Functions are as follows:

1. Create a Function (this resource)
2. Create a [Function Version](/docs/serverless/api/resource/function-version) via `serverless.twilio.com`

We will need the Function Version SID to include this Function in a [Build](/docs/serverless/api/resource/build).

## Function Properties

```json
{"type":"object","refName":"serverless.v1.service.function","modelName":"serverless_v1_service_function","properties":{"sid":{"type":"string","minLength":34,"maxLength":34,"pattern":"^ZH[0-9a-fA-F]{32}$","nullable":true,"description":"The unique string that we created to identify the Function resource."},"account_sid":{"type":"string","minLength":34,"maxLength":34,"pattern":"^AC[0-9a-fA-F]{32}$","nullable":true,"description":"The SID of the [Account](/docs/iam/api/account) that created the Function resource."},"service_sid":{"type":"string","minLength":34,"maxLength":34,"pattern":"^ZS[0-9a-fA-F]{32}$","nullable":true,"description":"The SID of the Service that the Function resource is associated with."},"friendly_name":{"type":"string","nullable":true,"description":"The string that you assigned to describe the Function resource. It can be a maximum of 255 characters.","x-twilio":{"pii":{"handling":"standard","deleteSla":7}}},"date_created":{"type":"string","format":"date-time","nullable":true,"description":"The date and time in GMT when the Function resource was created specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format."},"date_updated":{"type":"string","format":"date-time","nullable":true,"description":"The date and time in GMT when the Function resource was last updated specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format."},"url":{"type":"string","format":"uri","nullable":true,"description":"The absolute URL of the Function resource."},"links":{"type":"object","format":"uri-map","nullable":true,"description":"The URLs of nested resources of the Function resource."}}}
```

## Create a Function resource

`POST https://serverless.twilio.com/v1/Services/{ServiceSid}/Functions`

### Path parameters

```json
[{"name":"ServiceSid","in":"path","description":"The SID of the Service to create the Function resource under.","schema":{"type":"string"},"required":true}]
```

### Request body parameters

```json
{"schema":{"type":"object","title":"CreateFunctionRequest","required":["FriendlyName"],"properties":{"FriendlyName":{"type":"string","description":"A descriptive string that you create to describe the Function resource. It can be a maximum of 255 characters.","x-twilio":{"pii":{"handling":"standard","deleteSla":7}}}}},"examples":{"create":{"value":{"lang":"json","value":"{\n  \"FriendlyName\": \"function-friendly\"\n}","meta":"","code":"{\n  \"FriendlyName\": \"function-friendly\"\n}","tokens":[["{","#C9D1D9"],"\n  ",["\"FriendlyName\"","#7EE787"],[":","#C9D1D9"]," ",["\"function-friendly\"","#A5D6FF"],"\n",["}","#C9D1D9"]],"annotations":[],"themeName":"github-dark","style":{"color":"#c9d1d9","background":"#0d1117"}}}},"encodingType":"application/x-www-form-urlencoded","conditionalParameterMap":{}}
```

Create a Function

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function createFunction() {
  const func = await client.serverless.v1
    .services("ServiceSid")
    .functions.create({ friendlyName: "FriendlyName" });

  console.log(func.sid);
}

createFunction();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

function = client.serverless.v1.services("ServiceSid").functions.create(
    friendly_name="FriendlyName"
)

print(function.sid)
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Serverless.V1.Service;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        var function = await FunctionResource.CreateAsync(
            friendlyName: "FriendlyName", pathServiceSid: "ServiceSid");

        Console.WriteLine(function.Sid);
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.serverless.v1.service.Function;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        Function function = Function.creator("ServiceSid", "FriendlyName").create();

        System.out.println(function.getSid());
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	serverless "github.com/twilio/twilio-go/rest/serverless/v1"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	params := &serverless.CreateFunctionParams{}
	params.SetFriendlyName("FriendlyName")

	resp, err := client.ServerlessV1.CreateFunction("ServiceSid",
		params)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		if resp.Sid != nil {
			fmt.Println(*resp.Sid)
		} else {
			fmt.Println(resp.Sid)
		}
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$function = $twilio->serverless->v1->services("ServiceSid")->functions->create(
    "FriendlyName" // FriendlyName
);

print $function->sid;
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

function = @client
           .serverless
           .v1
           .services('ServiceSid')
           .functions
           .create(friendly_name: 'FriendlyName')

puts function.sid
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:serverless:v1:services:functions:create \
   --service-sid ServiceSid \
   --friendly-name FriendlyName
```

```bash
curl -X POST "https://serverless.twilio.com/v1/Services/ServiceSid/Functions" \
--data-urlencode "FriendlyName=FriendlyName" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

```json
{
  "sid": "ZH00000000000000000000000000000000",
  "account_sid": "ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "service_sid": "ServiceSid",
  "friendly_name": "FriendlyName",
  "date_created": "2018-11-10T20:00:00Z",
  "date_updated": "2018-11-10T20:00:00Z",
  "url": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions/ZH00000000000000000000000000000000",
  "links": {
    "function_versions": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions/ZH00000000000000000000000000000000/Versions"
  }
}
```

## Fetch a Function resource

`GET https://serverless.twilio.com/v1/Services/{ServiceSid}/Functions/{Sid}`

### Path parameters

```json
[{"name":"ServiceSid","in":"path","description":"The SID of the Service to fetch the Function resource from.","schema":{"type":"string"},"required":true},{"name":"Sid","in":"path","description":"The SID of the Function resource to fetch.","schema":{"type":"string","minLength":34,"maxLength":34,"pattern":"^ZH[0-9a-fA-F]{32}$"},"required":true}]
```

Fetch a Function

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function fetchFunction() {
  const func = await client.serverless.v1
    .services("ServiceSid")
    .functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    .fetch();

  console.log(func.sid);
}

fetchFunction();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

function = (
    client.serverless.v1.services("ServiceSid")
    .functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    .fetch()
)

print(function.sid)
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Serverless.V1.Service;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        var function = await FunctionResource.FetchAsync(
            pathServiceSid: "ServiceSid", pathSid: "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");

        Console.WriteLine(function.Sid);
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.serverless.v1.service.Function;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        Function function = Function.fetcher("ServiceSid", "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").fetch();

        System.out.println(function.getSid());
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	resp, err := client.ServerlessV1.FetchFunction("ServiceSid",
		"ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		if resp.Sid != nil {
			fmt.Println(*resp.Sid)
		} else {
			fmt.Println(resp.Sid)
		}
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$function = $twilio->serverless->v1
    ->services("ServiceSid")
    ->functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    ->fetch();

print $function->sid;
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

function = @client
           .serverless
           .v1
           .services('ServiceSid')
           .functions('ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
           .fetch

puts function.sid
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:serverless:v1:services:functions:fetch \
   --service-sid ServiceSid \
   --sid ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
```

```bash
curl -X GET "https://serverless.twilio.com/v1/Services/ServiceSid/Functions/ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

```json
{
  "sid": "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "account_sid": "ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "service_sid": "ServiceSid",
  "friendly_name": "test-function",
  "date_created": "2018-11-10T20:00:00Z",
  "date_updated": "2018-11-10T20:00:00Z",
  "url": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions/ZH00000000000000000000000000000000",
  "links": {
    "function_versions": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions/ZH00000000000000000000000000000000/Versions"
  }
}
```

## Read multiple Function resources

`GET https://serverless.twilio.com/v1/Services/{ServiceSid}/Functions`

### Path parameters

```json
[{"name":"ServiceSid","in":"path","description":"The SID of the Service to read the Function resources from.","schema":{"type":"string"},"required":true}]
```

### Query parameters

```json
[{"name":"PageSize","in":"query","description":"How many resources to return in each list page. The default is 50, and the maximum is 1000.","schema":{"type":"integer","format":"int64","minimum":1,"maximum":1000}},{"name":"Page","in":"query","description":"The page index. This value is simply for client state.","schema":{"type":"integer","minimum":0}},{"name":"PageToken","in":"query","description":"The page token. This is provided by the API.","schema":{"type":"string"}}]
```

List multiple Functions

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function listFunction() {
  const functions = await client.serverless.v1
    .services("ServiceSid")
    .functions.list({ limit: 20 });

  functions.forEach((f) => console.log(f.sid));
}

listFunction();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

functions = client.serverless.v1.services("ServiceSid").functions.list(limit=20)

for record in functions:
    print(record.sid)
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Serverless.V1.Service;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        var functions = await FunctionResource.ReadAsync(pathServiceSid: "ServiceSid", limit: 20);

        foreach (var record in functions) {
            Console.WriteLine(record.Sid);
        }
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.serverless.v1.service.Function;
import com.twilio.base.ResourceSet;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        ResourceSet<Function> functions = Function.reader("ServiceSid").limit(20).read();

        for (Function record : functions) {
            System.out.println(record.getSid());
        }
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	serverless "github.com/twilio/twilio-go/rest/serverless/v1"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	params := &serverless.ListFunctionParams{}
	params.SetLimit(20)

	resp, err := client.ServerlessV1.ListFunction("ServiceSid",
		params)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		for record := range resp {
			if resp[record].Sid != nil {
				fmt.Println(*resp[record].Sid)
			} else {
				fmt.Println(resp[record].Sid)
			}
		}
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$functions = $twilio->serverless->v1
    ->services("ServiceSid")
    ->functions->read(20);

foreach ($functions as $record) {
    print $record->sid;
}
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

functions = @client
            .serverless
            .v1
            .services('ServiceSid')
            .functions
            .list(limit: 20)

functions.each do |record|
   puts record.sid
end
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:serverless:v1:services:functions:list \
   --service-sid ServiceSid
```

```bash
curl -X GET "https://serverless.twilio.com/v1/Services/ServiceSid/Functions?PageSize=20" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

```json
{
  "functions": [],
  "meta": {
    "first_page_url": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions?PageSize=50&Page=0",
    "key": "functions",
    "next_page_url": null,
    "page": 0,
    "page_size": 50,
    "previous_page_url": null,
    "url": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions?PageSize=50&Page=0"
  }
}
```

## Update a Function resource

`POST https://serverless.twilio.com/v1/Services/{ServiceSid}/Functions/{Sid}`

### Path parameters

```json
[{"name":"ServiceSid","in":"path","description":"The SID of the Service to update the Function resource from.","schema":{"type":"string"},"required":true},{"name":"Sid","in":"path","description":"The SID of the Function resource to update.","schema":{"type":"string","minLength":34,"maxLength":34,"pattern":"^ZH[0-9a-fA-F]{32}$"},"required":true}]
```

### Request body parameters

```json
{"schema":{"type":"object","title":"UpdateFunctionRequest","required":["FriendlyName"],"properties":{"FriendlyName":{"type":"string","description":"A descriptive string that you create to describe the Function resource. It can be a maximum of 255 characters.","x-twilio":{"pii":{"handling":"standard","deleteSla":7}}}}},"examples":{"update":{"value":{"lang":"json","value":"{\n  \"FriendlyName\": \"function-friendly-update\"\n}","meta":"","code":"{\n  \"FriendlyName\": \"function-friendly-update\"\n}","tokens":[["{","#C9D1D9"],"\n  ",["\"FriendlyName\"","#7EE787"],[":","#C9D1D9"]," ",["\"function-friendly-update\"","#A5D6FF"],"\n",["}","#C9D1D9"]],"annotations":[],"themeName":"github-dark","style":{"color":"#c9d1d9","background":"#0d1117"}}}},"encodingType":"application/x-www-form-urlencoded","conditionalParameterMap":{}}
```

Update a Function

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function updateFunction() {
  const func = await client.serverless.v1
    .services("ServiceSid")
    .functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    .update({ friendlyName: "FriendlyName" });

  console.log(func.sid);
}

updateFunction();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

function = (
    client.serverless.v1.services("ServiceSid")
    .functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    .update(friendly_name="FriendlyName")
)

print(function.sid)
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Serverless.V1.Service;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        var function = await FunctionResource.UpdateAsync(
            friendlyName: "FriendlyName",
            pathServiceSid: "ServiceSid",
            pathSid: "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");

        Console.WriteLine(function.Sid);
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.serverless.v1.service.Function;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        Function function =
            Function.updater("ServiceSid", "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "FriendlyName").update();

        System.out.println(function.getSid());
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	serverless "github.com/twilio/twilio-go/rest/serverless/v1"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	params := &serverless.UpdateFunctionParams{}
	params.SetFriendlyName("FriendlyName")

	resp, err := client.ServerlessV1.UpdateFunction("ServiceSid",
		"ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
		params)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		if resp.Sid != nil {
			fmt.Println(*resp.Sid)
		} else {
			fmt.Println(resp.Sid)
		}
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$function = $twilio->serverless->v1
    ->services("ServiceSid")
    ->functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    ->update(
        "FriendlyName" // FriendlyName
    );

print $function->sid;
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

function = @client
           .serverless
           .v1
           .services('ServiceSid')
           .functions('ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
           .update(friendly_name: 'FriendlyName')

puts function.sid
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:serverless:v1:services:functions:update \
   --service-sid ServiceSid \
   --sid ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \
   --friendly-name FriendlyName
```

```bash
curl -X POST "https://serverless.twilio.com/v1/Services/ServiceSid/Functions/ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" \
--data-urlencode "FriendlyName=FriendlyName" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

```json
{
  "sid": "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "account_sid": "ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "service_sid": "ServiceSid",
  "friendly_name": "FriendlyName",
  "date_created": "2018-11-10T20:00:00Z",
  "date_updated": "2018-11-10T20:00:00Z",
  "url": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions/ZH00000000000000000000000000000000",
  "links": {
    "function_versions": "https://serverless.twilio.com/v1/Services/ZS00000000000000000000000000000000/Functions/ZH00000000000000000000000000000000/Versions"
  }
}
```

## Delete a Function resource

`DELETE https://serverless.twilio.com/v1/Services/{ServiceSid}/Functions/{Sid}`

> \[!NOTE]
>
> A Function will fail to delete if any of its [Versions](/docs/serverless/api/resource/function-version) are referenced by an active [Build](/docs/serverless/api/resource/build).
>
> If necessary, create a new Build that does not include the Function to be deleted, and delete the Function only once the Build has completed.

### Path parameters

```json
[{"name":"ServiceSid","in":"path","description":"The SID of the Service to delete the Function resource from.","schema":{"type":"string"},"required":true},{"name":"Sid","in":"path","description":"The SID of the Function resource to delete.","schema":{"type":"string","minLength":34,"maxLength":34,"pattern":"^ZH[0-9a-fA-F]{32}$"},"required":true}]
```

Delete a Function

```js
// Download the helper library from https://www.twilio.com/docs/node/install
const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = twilio(accountSid, authToken);

async function deleteFunction() {
  await client.serverless.v1
    .services("ServiceSid")
    .functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    .remove();
}

deleteFunction();
```

```python
# Download the helper library from https://www.twilio.com/docs/python/install
import os
from twilio.rest import Client

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = os.environ["TWILIO_ACCOUNT_SID"]
auth_token = os.environ["TWILIO_AUTH_TOKEN"]
client = Client(account_sid, auth_token)

client.serverless.v1.services("ServiceSid").functions(
    "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
).delete()
```

```csharp
// Install the C# / .NET helper library from twilio.com/docs/csharp/install

using System;
using Twilio;
using Twilio.Rest.Serverless.V1.Service;
using System.Threading.Tasks;

class Program {
    public static async Task Main(string[] args) {
        // Find your Account SID and Auth Token at twilio.com/console
        // and set the environment variables. See http://twil.io/secure
        string accountSid = Environment.GetEnvironmentVariable("TWILIO_ACCOUNT_SID");
        string authToken = Environment.GetEnvironmentVariable("TWILIO_AUTH_TOKEN");

        TwilioClient.Init(accountSid, authToken);

        await FunctionResource.DeleteAsync(
            pathServiceSid: "ServiceSid", pathSid: "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    }
}
```

```java
// Install the Java helper library from twilio.com/docs/java/install

import com.twilio.Twilio;
import com.twilio.rest.serverless.v1.service.Function;

public class Example {
    // Find your Account SID and Auth Token at twilio.com/console
    // and set the environment variables. See http://twil.io/secure
    public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
    public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
        Function.deleter("ServiceSid", "ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").delete();
    }
}
```

```go
// Download the helper library from https://www.twilio.com/docs/go/install
package main

import (
	"fmt"
	"github.com/twilio/twilio-go"
	"os"
)

func main() {
	// Find your Account SID and Auth Token at twilio.com/console
	// and set the environment variables. See http://twil.io/secure
	// Make sure TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN exists in your environment
	client := twilio.NewRestClient()

	err := client.ServerlessV1.DeleteFunction("ServiceSid",
		"ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}
}
```

```php
<?php

// Update the path below to your autoload.php,
// see https://getcomposer.org/doc/01-basic-usage.md
require_once "/path/to/vendor/autoload.php";

use Twilio\Rest\Client;

// Find your Account SID and Auth Token at twilio.com/console
// and set the environment variables. See http://twil.io/secure
$sid = getenv("TWILIO_ACCOUNT_SID");
$token = getenv("TWILIO_AUTH_TOKEN");
$twilio = new Client($sid, $token);

$twilio->serverless->v1
    ->services("ServiceSid")
    ->functions("ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    ->delete();
```

```ruby
# Download the helper library from https://www.twilio.com/docs/ruby/install
require 'twilio-ruby'

# Find your Account SID and Auth Token at twilio.com/console
# and set the environment variables. See http://twil.io/secure
account_sid = ENV['TWILIO_ACCOUNT_SID']
auth_token = ENV['TWILIO_AUTH_TOKEN']
@client = Twilio::REST::Client.new(account_sid, auth_token)

@client
  .serverless
  .v1
  .services('ServiceSid')
  .functions('ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
  .delete
```

```bash
# Install the twilio-cli from https://twil.io/cli

twilio api:serverless:v1:services:functions:remove \
   --service-sid ServiceSid \
   --sid ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
```

```bash
curl -X DELETE "https://serverless.twilio.com/v1/Services/ServiceSid/Functions/ZHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```