Smartcar Ruby SDK Gem Version

Ruby gem library to quickly get started with the Smartcar API.


The Smartcar API lets you read vehicle data (location, odometer) and send commands to vehicles (lock, unlock) using HTTP requests.

To make requests to a vehicle from a web or mobile application, the end user must connect their vehicle using Smartcar Connect. This flow follows the OAuth spec and will return a code which can be used to obtain an access token from Smartcar.

The Smartcar Ruby Gem provides methods to:

  1. Generate the link to redirect to Connect.
  2. Make a request to Smartcar with the code obtained from Connect to obtain an access and refresh token
  3. Make requests to the Smartcar API to read vehicle data and send commands to vehicles using the access token obtained in step 2.

Before integrating with Smartcar's SDK, you'll need to register an application in the Smartcar Developer portal. If you do not have access to the dashboard, please request access.


  • Create a new AuthClient object with your client_id, client_secret, redirect_uri. -
  • Redirect the user to Smartcar Connect using get_auth_url with required scope or with one of our frontend SDKs.
  • The user will login, and then accept or deny your scope's permissions.
  • Handle the get request to redirect_uri.
    • If the user accepted your permissions, req.query.code will contain an authorization code.
    • Use exchange_code with this code to obtain an access object containing an access token (lasting 2 hours) and a refresh token (lasting 60 days).
      • Save this access object.
    • If the user denied your permissions, req.query.error will be set to "access_denied".
    • If you passed a state parameter to get_auth_url, req.query.state will contain the state value.
  • Get the user's vehicles with getVehicles.
  • Create a new Vehicle object using a vehicle_id from the previous response, and the access_token.
  • Make requests to the Smartcar API.
  • Use exchange_refresh_token on your saved refresh_token to retrieve a new token when your access_token expires.


Add this line to your application's Gemfile:

gem 'smartcar'

And then execute:

$ bundle

Or install it yourself as:

$ gem install smartcar



# Get your API keys from
export SMARTCAR_CLIENT_ID=<client id>
export SMARTCAR_CLIENT_SECRET=<client secret>
# Optional ENV variables
export SMARTCAR_CONNECT_ORIGIN=(default_value: Used as the host for the URL that starts the Connect/OAuth2 flow
export SMARTCAR_AUTH_ORIGIN=(default_value: Used as the host for the token exchange requests

Example Usage for calling the reports API with oAuth token

2.5.7 :001 > require 'smartcar'
 => true
2.5.7 :003 > ids =  Smartcar.get_vehicles(token: token).vehicles
 => ["4bb777b2-bde7-4305-8952-25956f8c0868"]
2.5.7 :004 > vehicle = token, id: ids.first)
 => #<Smartcar::Vehicle:0x0000558dcd7ee608 @token="c900e00e-ee8e-403d-a7bf-f992bc0ad302", @id="e31c9de6-1332-472b-b648-5d74b05b7fda", @options={:unit_system=>"metric", :version=>"2.0"}, @unit_system="metric", @version="2.0", @service=#<Faraday::Connection:0x0000558dcd7d63f0 @parallel_manager=nil, @headers={"User-Agent"=>"Faraday v1.4.2"}, @params={}, @options=#<Faraday::RequestOptions timeout=310>, @ssl=#<Faraday::SSLOptions verify=true>, @default_parallel_manager=nil, @builder=#<Faraday::RackBuilder:0x0000558dcd7c1bf8 @adapter=Faraday::Adapter::NetHttp, @handlers=[Faraday::Request::UrlEncoded], @app=#<Faraday::Request::UrlEncoded:0x0000558dcd7af048 @app=#<Faraday::Adapter::NetHttp:0x0000558dcd7af390 @ssl_cert_store=#<OpenSSL::X509::Store:0x0000558dcd7a36a8 @verify_callback=nil, @error=nil, @error_string=nil, @chain=nil, @time=nil>, @app=#<Proc:0x0000558dcd7af278 /home/ashwinsubramanian/.rvm/gems/ruby-2.7.2/gems/faraday-1.4.2/lib/faraday/adapter.rb:37 (lambda)>, @connection_options={}, @config_block=nil>, @options={}>>, @url_prefix=#<URI::HTTPS>, @proxy=nil, @manual_proxy=false>>
2.5.7 :006 > vehicle.odometer
 => #<OpenStruct distance=39685.33984375, meta=#<OpenStruct data_age=#<DateTime: 2021-06-24T22:28:39+00:00 ((2459390j,80919s,95000000n),+0s,2299161j)>, unit_system="metric", request_id="4962ba7f-5c94-48ab-9955-4e2b101c7b8a">>
2.5.7 :007 > vehicle.battery
 => #<OpenStruct range=208.82, percentRemaining=0.31, meta=#<OpenStruct data_age=#<DateTime: 2021-06-24T22:28:54+00:00 ((2459390j,80934s,855000000n),+0s,2299161j)>, unit_system="metric", request_id="a88b95ec-b10f-4fc8-979b-5d95fe40d925">, percentage_remaining=0.31>
2.5.7 :009 > vehicle.lock!
 => #<OpenStruct status="success", message="Successfully sent request to vehicle", meta=#<OpenStruct request_id="0c90918f-a9cc-405c-839f-7d9b70e249c4">>
2.5.7 :010 > batch_response = vehicle.batch(["/charge","/battery"])
=> #<OpenStruct>
2.5.7 :011 > batch_response.charge()
=> #<OpenStruct state="NOT_CHARGING", isPluggedIn=false, meta=#<OpenStruct data_age=#<DateTime: 2021-06-24T22:30:20+00:00 ((2459390j,81020s,892000000n),+0s,2299161j)>, request_id="29a66280-8685-4a57-9733-daa3dfb9970f">, is_plugged_in?=false>

Example Usage for oAuth -

# To get the redirect URL :
2.5.5 :002 > options = {mode: 'test'}
2.5.5 :003 > require 'smartcar'
2.5.5 :004 > client =
2.5.5 :005 > url = client.get_auth_url(["read_battery","read_charge","read_fuel","read_location","control_security","read_odometer","read_tires","read_vin","read_vehicle_info"], {flags: ["country:DE"]})
 => "<client id>&mode=test&redirect_uri=http%3A%2F%2Flocalhost%3A8000%2Fcallback&response_type=code&scope=read_battery+read_charge+read_fuel+read_location+control_security+read_odometer+read_tires+read_vin+read_vehicle_info&flags=country%3ADE"
# Redirect user to the above URL.
# After authentication user control reaches the callback URL with code.
# Use the code from the parameters and request a token
2.5.5 :006 > token_hash = client.exchange_code(code)
 => #<OpenStruct token_type="Bearer", access_token="20e24b4a-3055-4cc8-9cf3-2b3c5afba3e6", refresh_token="cf89c62e-7b36-4e13-a9df-d9c2a5296280", expires_at=1624581588>
# This access_token can be used to call the Smartcar APIs as given above.
# Store this hash and if it expired refresh the token OR use the code again to
# get a new token or use .

Advanced configuration

This SDK uses the Faraday HTTP client library which supports extensive customization through the use of middleware. If you need to customize the behavior of HTTP request/response processing, you can provide your own instance of Faraday::Connection to most methods in this library.

Important: If you provide your own Faraday connection, you are responsible for configuring all HTTP connection behavior, including timeouts! This SDK uses some custom timeouts internally to ensure best behavior by default, so unless you want to customize them you may want to replicate those timeouts.

Example of providing a custom Faraday connection to various methods:

  # Example Faraday connection that uses the Instrumentation middleware
  service = Smartcar::API_ORIGIN, request: { timeout: Smartcar::DEFAULT_REQUEST_TIMEOUT }) do |c|
    c.request :instrumentation

  # Passing the custom service to #get_vehicles
  Smartcar.get_vehicles(token: token, options: { service: service })

  # Passing the custom service to #get_user
  Smartcar.get_user(token: token, options: { service: service })

  # Passing the custom service to #get_compatibility
  Smartcar.get_compatibility(vin: vin, scope: scope, options: { service: service })

  # Passing the custom service into a Smartcar::Vehicle object
  vehicle = token, id: id, options: { service: service })

  connections = Smartcar.get_connections(amt: 'amt', filter: {userId: 'user-id'}, options: {service: service})


To install this gem onto your local machine, run bundle exec rake install.

To run tests, make sure you have the env variables setup for client id and secret.

export E2E_SMARTCAR_CLIENT_ID=<client id>
export E2E_SMARTCAR_CLIENT_SECRET=<client secret>
export E2E_SMARTCAR_AMT=<amt from dashboard for webhooks>
export E2E_SMARTCAR_WEBHOOK_ID=<webhook id to use for tests>

Tests can be run using either default rake command OR specific rspec command.

bundle exec rake spec

NOTE : Do not forget to update the version number in version.rb.


Deployments to Rubgygems is automated through Travis. After merging to master, create a tag on the latest commit on master and push it. That would trigger a CI job which will build, test and deploy to Rubygems. As a convention we use the version number of the gem for the release tag.

# After merging to master, checkout to master and pull code locally, then run the following
git tag v1.2.3
# now push the tags
git push origin --tags
Total 0 (delta 0), reused 0 (delta 0)
 * [new tag]         v1.2.3 -> v1.2.3


To contribute, please:

  1. Open an issue for the feature (or bug) you would like to resolve.
  2. Resolve the issue and add tests in your feature branch.
  3. Open a PR from your feature branch into master that tags the issue.

Supported Ruby Branches

Smartcar aims to support the SDK on all Ruby branches that have a status of "normal maintenance" or "security maintenance" as defined in the Ruby Branches documentation.

In accordance with the Semantic Versioning specification, the addition of support for new Ruby branches would result in a MINOR version bump and the removal of support for Ruby branches would result in a MAJOR version bump.