ElevenLabs-DotNet

A non-official Eleven Labs voice synthesis RESTful client.

I am not affiliated with ElevenLabs and an account with api access is required.

All copyrights, trademarks, logos, and assets are the property of their respective owners.

Getting started

Install from NuGet

Install package ElevenLabs-DotNet from Nuget. Here's how via command line:

Install-Package ElevenLabs-DotNet

Looking to use ElevenLabs in the Unity Game Engine? Check out our unity package on OpenUPM:

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Documentation

Table of Contents

• Authentication
• API Proxy
• Text to Speech
  • Stream Text To Speech
• Voices
  • Get All Voices
  • Get Default Voice Settings
  • Get Voice
  • Edit Voice Settings
  • Add Voice
  • Edit Voice
  • Delete Voice
  • Samples
    • Download Voice Sample
    • Delete Voice Sample
• History
  • Get History
  • Get History Item
  • Download History Audio
  • Download History Items
  • Delete History Item
• User
  • Get User Info
  • Get Subscription Info

Authentication

There are 3 ways to provide your API keys, in order of precedence:

1. Pass keys directly with constructor
2. Load key from configuration file
3. Use System Environment Variables

Pass keys directly with constructor

var api = new ElevenLabsClient("yourApiKey");

Or create a ElevenLabsAuthentication object manually

var api = new ElevenLabsClient(new ElevenLabsAuthentication("yourApiKey"));

Load key from configuration file

Attempts to load api keys from a configuration file, by default .elevenlabs in the current directory, optionally traversing up the directory tree or in the user's home directory.

To create a configuration file, create a new text file named .elevenlabs and containing the line:

Json format

{
  "apiKey": "yourApiKey",
}

You can also load the file directly with known path by calling a static method in Authentication:

var api = new ElevenLabsClient(ElevenLabsAuthentication.LoadFromDirectory("your/path/to/.elevenlabs"));;

Use System Environment Variables

Use your system's environment variables specify an api key to use.

• Use ELEVEN_LABS_API_KEY for your api key.

var api = new ElevenLabsClient(ElevenLabsAuthentication.LoadFromEnv());

API Proxy

Using either the ElevenLabs-DotNet or com.rest.elevenlabs packages directly in your front-end app may expose your API keys and other sensitive information. To mitigate this risk, it is recommended to set up an intermediate API that makes requests to ElevenLabs on behalf of your front-end app. This library can be utilized for both front-end and intermediary host configurations, ensuring secure communication with the ElevenLabs API.

Front End Example

In the front end example, you will need to securely authenticate your users using your preferred OAuth provider. Once the user is authenticated, exchange your custom auth token with your API key on the backend.

Follow these steps:

1. Setup a new project using either the ElevenLabs-DotNet or com.rest.elevenlabs packages.
2. Authenticate users with your OAuth provider.
3. After successful authentication, create a new ElevenLabsAuthentication object and pass in the custom token.
4. Create a new ElevenLabsClientSettings object and specify the domain where your intermediate API is located.
5. Pass your new auth and settings objects to the ElevenLabsClient constructor when you create the client instance.

Here's an example of how to set up the front end:

var authToken = await LoginAsync();
var auth = new ElevenLabsAuthentication(authToken);
var settings = new ElevenLabsClientSettings(domain: "api.your-custom-domain.com");
var api = new ElevenLabsClient(auth, settings);

This setup allows your front end application to securely communicate with your backend that will be using the ElevenLabs-DotNet-Proxy, which then forwards requests to the ElevenLabs API. This ensures that your ElevenLabs API keys and other sensitive information remain secure throughout the process.

Back End Example

In this example, we demonstrate how to set up and use ElevenLabsProxyStartup in a new ASP.NET Core web app. The proxy server will handle authentication and forward requests to the ElevenLabs API, ensuring that your API keys and other sensitive information remain secure.

1. Create a new ASP.NET Core minimal web API project.
2. Add the ElevenLabs-DotNet nuget package to your project.
   • Powershell install: Install-Package ElevenLabs-DotNet-Proxy
   • Manually editing .csproj: <PackageReference Include="ElevenLabs-DotNet-Proxy" />
3. Create a new class that inherits from AbstractAuthenticationFilter and override the ValidateAuthentication method. This will implement the IAuthenticationFilter that you will use to check user session token against your internal server.
4. In Program.cs, create a new proxy web application by calling ElevenLabsProxyStartup.CreateWebApplication method, passing your custom AuthenticationFilter as a type argument.
5. Create ElevenLabsAuthentication and ElevenLabsClientSettings as you would normally with your API keys, org id, or Azure settings.

public partial class Program
{
    private class AuthenticationFilter : AbstractAuthenticationFilter
    {
        public override void ValidateAuthentication(IHeaderDictionary request)
        {
            // You will need to implement your own class to properly test
            // custom issued tokens you've setup for your end users.
            if (!request["xi-api-key"].ToString().Contains(TestUserToken))
            {
                throw new AuthenticationException("User is not authorized");
            }
        }

        public override async Task ValidateAuthenticationAsync(IHeaderDictionary request)
        {
            await Task.CompletedTask; // remote resource call

            // You will need to implement your own class to properly test
            // custom issued tokens you've setup for your end users.
            if (!request["xi-api-key"].ToString().Contains(TestUserToken))
            {
                throw new AuthenticationException("User is not authorized");
            }
        }
    }

    public static void Main(string[] args)
    {
        var auth = ElevenLabsAuthentication.LoadFromEnv();
        var client = new ElevenLabsClient(auth);
        ElevenLabsProxyStartup.CreateWebApplication<AuthenticationFilter>(args, client).Run();
    }
}

Once you have set up your proxy server, your end users can now make authenticated requests to your proxy api instead of directly to the ElevenLabs API. The proxy server will handle authentication and forward requests to the ElevenLabs API, ensuring that your API keys and other sensitive information remain secure.

Text to Speech

Convert text to speech.

var api = new ElevenLabsClient();
var text = "The quick brown fox jumps over the lazy dog.";
var voice = (await api.VoicesEndpoint.GetAllVoicesAsync()).FirstOrDefault();
var defaultVoiceSettings = await api.VoicesEndpoint.GetDefaultVoiceSettingsAsync();
var voiceClip = await api.TextToSpeechEndpoint.TextToSpeechAsync(text, voice, defaultVoiceSettings);
await File.WriteAllBytesAsync($"{voiceClip.Id}.mp3", voiceClip.ClipData.ToArray());

Stream Text To Speech

Stream text to speech.

var api = new ElevenLabsClient();
var text = "The quick brown fox jumps over the lazy dog.";
var voice = (await api.VoicesEndpoint.GetAllVoicesAsync()).FirstOrDefault();
string fileName = "myfile.mp3";
using var outputFileStream = File.OpenWrite(fileName);
var voiceClip = await api.TextToSpeechEndpoint.TextToSpeechAsync(text, voice,
partialClipCallback: async (partialClip) =>
{
    // Write the incoming data to the output file stream.
    // Alternatively you can play this clip data directly.
    await outputFileStream.WriteAsync(partialClip.ClipData);
});

Voices

Access to voices created either by the user or ElevenLabs.

Get All Voices

Gets a list of all available voices.

var api = new ElevenLabsClient();
var allVoices = await api.VoicesEndpoint.GetAllVoicesAsync();

foreach (var voice in allVoices)
{
    Console.WriteLine($"{voice.Id} | {voice.Name} | similarity boost: {voice.Settings?.SimilarityBoost} | stability: {voice.Settings?.Stability}");
}

Get Default Voice Settings

Gets the global default voice settings.

var api = new ElevenLabsClient();
var result = await api.VoicesEndpoint.GetDefaultVoiceSettingsAsync();
Console.WriteLine($"stability: {result.Stability} | similarity boost: {result.SimilarityBoost}");

Get Voice

var api = new ElevenLabsClient();
var voice = await api.VoicesEndpoint.GetVoiceAsync("voiceId");
Console.WriteLine($"{voice.Id} | {voice.Name} | {voice.PreviewUrl}");

Edit Voice Settings

Edit the settings for a specific voice.

var api = new ElevenLabsClient();
var success = await api.VoicesEndpoint.EditVoiceSettingsAsync(voice, new VoiceSettings(0.7f, 0.7f));
Console.WriteLine($"Was successful? {success}");

Add Voice

var api = new ElevenLabsClient();
var labels = new Dictionary<string, string>
{
    { "accent", "american" }
};
var audioSamplePaths = new List<string>();
var voice = await api.VoicesEndpoint.AddVoiceAsync("Voice Name", audioSamplePaths, labels);

Edit Voice

var api = new ElevenLabsClient();
var labels = new Dictionary<string, string>
{
    { "age", "young" }
};
var audioSamplePaths = new List<string>();
var success = await api.VoicesEndpoint.EditVoiceAsync(voice, audioSamplePaths, labels);
Console.WriteLine($"Was successful? {success}");

Delete Voice

var api = new ElevenLabsClient();
var success = await api.VoicesEndpoint.DeleteVoiceAsync(voiceId);
Console.WriteLine($"Was successful? {success}");

Samples

Access to your samples, created by you when cloning voices.

Download Voice Sample

var api = new ElevenLabsClient();
var voiceClip = await api.VoicesEndpoint.DownloadVoiceSampleAsync(voice, sample);
await File.WriteAllBytesAsync($"{voiceClip.Id}.mp3", voiceClip.ClipData.ToArray());

Delete Voice Sample

var api = new ElevenLabsClient();
var success = await api.VoicesEndpoint.DeleteVoiceSampleAsync(voiceId, sampleId);
Console.WriteLine($"Was successful? {success}");

History

Access to your previously synthesized audio clips including its metadata.

Get History

Get metadata about all your generated audio.

var api = new ElevenLabsClient();
var historyItems = await api.HistoryEndpoint.GetHistoryAsync();

foreach (var item in historyItems.OrderBy(historyItem => historyItem.Date))
{
    Console.WriteLine($"{item.State} {item.Date} | {item.Id} | {item.Text.Length} | {item.Text}");
}

Get History Item

Get information about a specific item.

var api = new ElevenLabsClient();
var historyItem = await api.HistoryEndpoint.GetHistoryItemAsync(voiceClip.Id);

Download History Audio

var api = new ElevenLabsClient();
var voiceClip = await api.HistoryEndpoint.DownloadHistoryAudioAsync(historyItem);
await File.WriteAllBytesAsync($"{voiceClip.Id}.mp3", voiceClip.ClipData.ToArray());

Download History Items

Downloads the last 100 history items, or the collection of specified items.

var api = new ElevenLabsClient();
var voiceClips = await api.HistoryEndpoint.DownloadHistoryItemsAsync();

Delete History Item

var api = new ElevenLabsClient();
var success = await api.HistoryEndpoint.DeleteHistoryItemAsync(historyItem);
Console.WriteLine($"Was successful? {success}");

User

Access to your user Information and subscription status.

Get User Info

Gets information about your user account with ElevenLabs.

var api = new ElevenLabsClient();
var userInfo = await api.UserEndpoint.GetUserInfoAsync();

Get Subscription Info

Gets information about your subscription with ElevenLabs.

var api = new ElevenLabsClient();
var subscriptionInfo = await api.UserEndpoint.GetSubscriptionInfoAsync();