Vonage Server SDK for Ruby

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Nexmo is now known as Vonage

This is the Ruby Server SDK for Vonage APIs. To use it you'll need a Vonage account. Sign up for free at vonage.com.


Vonage Ruby supports MRI/CRuby (2.5 or newer), JRuby (9.2.x), and Truffleruby.


To install the Ruby Server SDK using Rubygems:

gem install vonage

Alternatively you can clone the repository:

git clone git@github.com:Vonage/vonage-ruby-sdk.git


Begin by requiring the Vonage library:

require 'vonage'

Then construct a client object with your key and secret:

client = Vonage::Client.new(api_key: 'YOUR-API-KEY', api_secret: 'YOUR-API-SECRET')

You can now use the client object to call Vonage APIs. For example, to send an SMS:

client.sms.send(from: 'Ruby', to: '447700900000', text: 'Hello world')

For production you can specify the VONAGE_API_KEY and VONAGE_API_SECRET environment variables instead of specifying the key and secret explicitly, keeping your credentials out of source control.


Use the logger option to specify a logger. For example:

require 'logger'

logger = Logger.new(STDOUT)

client = Vonage::Client.new(logger: logger)

By default the library sets the logger to Rails.logger if it is defined.

To disable logging set the logger to nil.

Overriding the default hosts

To override the default hosts that the SDK uses for HTTP requests, you need to specify the api_host, rest_host or both in the client configuration. For example:

client = Vonage::Client.new(
  api_host: 'api-sg-1.nexmo.com',
  rest_host: 'rest-sg-1.nexmo.com'

By default the hosts are set to api.nexmo.com and rest.nexmo.com, respectively.

JWT authentication

To call newer endpoints that support JWT authentication such as the Voice API and Messages API you'll also need to specify the application_id and private_key options. For example:

client = Vonage::Client.new(application_id: application_id, private_key: private_key)

Both arguments should have string values corresponding to the id and private_key values returned in a "create an application" response. These credentials can be stored in a datastore, in environment variables, on disk outside of source control, or in some kind of key management infrastructure.

By default the library generates a short lived JWT per request. To generate a long lived JWT for multiple requests or to specify JWT claims directly use Vonage::JWT.generate and the token option. For example:

claims = {
  application_id: application_id,
  private_key: 'path/to/private.key',
  nbf: 1483315200,
  ttl: 800

token = Vonage::JWT.generate(claims)

client = Vonage::Client.new(token: token)

Documentation for the Vonage Ruby JWT generator gem can be found at https://www.rubydoc.info/github/nexmo/nexmo-jwt-ruby. The documentation outlines all the possible parameters you can use to customize and build a token with.

Webhook signatures

To check webhook signatures you'll also need to specify the signature_secret option. For example:

client = Vonage::Client.new
client.config.signature_secret = 'secret'
client.config.signature_method = 'sha512'

if client.signature.check(request.GET)
  # valid signature
  # invalid signature

Alternatively you can set the VONAGE_SIGNATURE_SECRET environment variable.

Note: you'll need to contact [email protected] to enable message signing on your account.


Vonage APIs paginate list requests. This means that if a collection is requested that is larger than the API default, the API will return the first page of items in the collection. The Ruby SDK provides an auto_advance parameter that will traverse through the pages and return all the results in one response object.

The auto_advance parameter is set to a default of true for the following APIs:

To modify the auto_advance behavior you can specify it in your method:

client.applications.list(auto_advance: false)

NCCO Builder

The Vonage Voice API accepts instructions via JSON objects called NCCOs. Each NCCO can be made up multiple actions that are executed in the order they are written. The Vonage API Developer Portal contains an NCCO Reference with instructions and information on all the parameters possible.

The SDK includes an NCCO builder that you can use to build NCCOs for your Voice API methods.

For example, to build talk and input NCCO actions and then combine them into a single NCCO you would do the following:

talk = Vonage::Voice::Ncco.talk(text: 'Hello World!')
input = Vonage::Voice::Ncco.input(type: ['dtmf'], dtmf: { bargeIn: true })
ncco = Vonage::Voice::Ncco.build(talk, input)

# => [{:action=>"talk", :text=>"Hello World!"}, {:action=>"input", :type=>["dtmf"], :dtmf=>{:bargeIn=>true}}]

Once you have the constructed NCCO you can then use it in a Voice API request:

response = client.voice.create({
  to: [{type: 'phone', number: '14843331234'}],
  from: {type: 'phone', number: '14843335555'},
  ncco: ncco

Messages API

The Vonage Messages API allows you to send messages over a number of different channels, and various message types within each channel. See the Vonage Developer Documentation for a complete API reference listing all the channel and message type combinations.

The Ruby SDK allows you to construct message data for specific messaging channels. Other than SMS (which has only one type -- text), you need to pass the message :type as well as the :message itself as arguments to the appropriate messages method, along with any optional properties if needed.

# creating an SMS message
message = Vonage::Messaging::Message.sms(message: 'Hello world!')

# creating a WhatsApp Text message
message = Vonage::Messaging::Message.whatsapp(type: 'text', message: 'Hello world!')

# creating a WhatsApp Image message
message = Vonage::Messaging::Message.whatsapp(type: 'image', message: { url: 'https://example.com/image.jpg' })

# creating an MMS audio message with optional properties
message = Vonage::Messaging::Message.mms(type: 'audio', message: { url: 'https://example.com/audio.mp3' }, opts: {client_ref: "abc123"})

Once the message data is created, you can then send the message.

response = client.messaging.send(to: "447700900000", from: "447700900001", **message)


Vonage Ruby documentation: https://www.rubydoc.info/github/Vonage/vonage-ruby-sdk

Vonage Ruby code examples: https://github.com/Nexmo/nexmo-ruby-code-snippets

Vonage APIs API reference: https://developer.nexmo.com/api

Frequently Asked Questions

Supported APIs

The following is a list of Vonage APIs and whether the Ruby SDK provides support for them:

API API Release Status Supported?
Account API General Availability
Alerts API General Availability
Application API General Availability
Audit API Beta
Conversation API Beta
Dispatch API Beta
External Accounts API Beta
Media API Beta
Messages API General Availability
Number Insight API General Availability
Number Management API General Availability
Pricing API General Availability
Redact API Developer Preview
Reports API Beta
SMS API General Availability
Verify API General Availability
Voice API General Availability


This library is released under the Apache 2.0 License