diff --git a/lib/frederick_api.rb b/lib/frederick_api.rb
index 5da2b32..fd0f7b9 100644
--- a/lib/frederick_api.rb
+++ b/lib/frederick_api.rb
@@ -7,6 +7,7 @@
 
 # FrederickAPI libs
 require 'frederick_api/configuration'
+require 'frederick_api/v2/errors/errors'
 require 'frederick_api/v2/helpers/has_many'
 require 'frederick_api/v2/helpers/paginator'
 require 'frederick_api/v2/helpers/query_builder'
diff --git a/lib/frederick_api/v2/errors/errors.rb b/lib/frederick_api/v2/errors/errors.rb
new file mode 100644
index 0000000..305a1b1
--- /dev/null
+++ b/lib/frederick_api/v2/errors/errors.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module FrederickAPI
+  module V2
+    module Errors
+      # Base exception class for client errors (i.e. validation, bad request)
+      class Error < JsonApiClient::Errors::ClientError
+        attr_reader :errors
+
+        # Initialize with a JsonApiClient::ResultSet or a Resource
+        def initialize(result)
+          # @env is used in base class JsonApiClient::Errors::Error
+          @env = result
+          @errors = result.errors || []
+        end
+
+        def to_s
+          return "Client Error: #{self.errors.first['detail']}" if self.errors.any?
+          super
+        end
+      end
+
+      class BadRequest < Error; end
+      class UnprocessableEntity < Error; end
+
+      ERROR_CODES = {
+        '400' => BadRequest,
+        '422' => UnprocessableEntity
+      }.freeze
+    end
+  end
+end
diff --git a/lib/frederick_api/v2/helpers/requestor.rb b/lib/frederick_api/v2/helpers/requestor.rb
index fee5386..41b7cfd 100644
--- a/lib/frederick_api/v2/helpers/requestor.rb
+++ b/lib/frederick_api/v2/helpers/requestor.rb
@@ -23,11 +23,20 @@ def resource_path(parameters)
 
         # Retry once on unhandled server errors
         def request(type, path, params)
-          super
+          handle_errors(super)
         rescue JsonApiClient::Errors::ConnectionError, JsonApiClient::Errors::ServerError => ex
           raise ex if ex.is_a?(JsonApiClient::Errors::NotFound) || ex.is_a?(JsonApiClient::Errors::Conflict)
-          super
+          handle_errors(super)
         end
+
+        private
+
+          def handle_errors(result)
+            return result unless result.has_errors?
+            error_klass = FrederickAPI::V2::Errors::ERROR_CODES[result.errors.first[:status]] ||
+              FrederickAPI::V2::Errors::Error
+            raise error_klass, result
+          end
       end
     end
   end
diff --git a/lib/frederick_api/v2/resource.rb b/lib/frederick_api/v2/resource.rb
index 14db611..d3004a6 100644
--- a/lib/frederick_api/v2/resource.rb
+++ b/lib/frederick_api/v2/resource.rb
@@ -18,6 +18,10 @@ def initialize(params = {})
         super
       end
 
+      def has_errors?
+        self.errors.present?
+      end
+
       def self.all_records
         self.all.pages.all_records
       end
diff --git a/lib/frederick_api/version.rb b/lib/frederick_api/version.rb
index 303e399..3c2eaee 100644
--- a/lib/frederick_api/version.rb
+++ b/lib/frederick_api/version.rb
@@ -2,5 +2,5 @@
 
 module FrederickAPI
   # Current gem version
-  VERSION = '0.3.2'
+  VERSION = '0.4.0'
 end
diff --git a/spec/frederick_api/v2/errors/errors_spec.rb b/spec/frederick_api/v2/errors/errors_spec.rb
new file mode 100644
index 0000000..0b1cf76
--- /dev/null
+++ b/spec/frederick_api/v2/errors/errors_spec.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe FrederickAPI::V2::Errors do
+  it 'ERROR_CODES' do
+    expect(described_class::ERROR_CODES).to eq(
+      '400' => FrederickAPI::V2::Errors::BadRequest,
+      '422' => FrederickAPI::V2::Errors::UnprocessableEntity
+    )
+  end
+end
+
+module FrederickAPI::V2::Errors
+  describe Error do
+    let(:result) { FrederickAPI::V2::Resource.new }
+    let(:instance) { described_class.new(result) }
+    let(:errors) { 'the errors' }
+
+    before do
+      allow(result).to receive(:errors).and_return errors
+    end
+
+    describe '#initialize' do
+      context 'result has errors' do
+        it 'sets env and errors' do
+          expect(instance.errors).to be errors
+          expect(instance.env).to be result
+        end
+      end
+
+      context 'result does not have errors' do
+        let(:errors) { nil }
+
+        it 'sets env and errors' do
+          expect(instance.errors).to eq []
+          expect(instance.env).to be result
+        end
+      end
+    end
+  end
+
+  describe BadRequest do
+    subject { described_class.new(FrederickAPI::V2::Resource.new) }
+
+    it { is_expected.to be_a(Error) }
+  end
+
+  describe UnprocessableEntity do
+    subject { described_class.new(FrederickAPI::V2::Resource.new) }
+
+    it { is_expected.to be_a(Error) }
+  end
+end
diff --git a/spec/frederick_api/v2/helpers/requestor_spec.rb b/spec/frederick_api/v2/helpers/requestor_spec.rb
index 721fd3e..601b7ac 100644
--- a/spec/frederick_api/v2/helpers/requestor_spec.rb
+++ b/spec/frederick_api/v2/helpers/requestor_spec.rb
@@ -43,6 +43,106 @@
     end
   end
 
+  describe '#handle_errors' do
+    let(:has_errors) { false }
+
+    context 'with a ResultSet' do
+      let(:result) { instance_double(JsonApiClient::ResultSet) }
+
+      before { allow(result).to receive(:has_errors?).and_return has_errors }
+
+      context 'no errors' do
+        it 'returns result' do
+          expect(requestor.send(:handle_errors, result)).to be(result)
+        end
+      end
+
+      context 'has errors' do
+        let(:has_errors) { true }
+        let(:errors) { instance_double(JsonApiClient::ErrorCollector) }
+        let(:error) { instance_double(JsonApiClient::ErrorCollector::Error) }
+
+        before do
+          allow(result).to receive(:errors).and_return errors
+          allow(errors).to receive(:first).and_return error
+          allow(error).to receive(:[]).with(:status).and_return status
+        end
+
+        context 'error has a known status' do
+          let(:status) { '400' }
+
+          it 'raises correct error' do
+            expect { requestor.send(:handle_errors, result) }.to raise_error FrederickAPI::V2::Errors::BadRequest
+          end
+        end
+
+        context 'error has a unanticipated status' do
+          let(:status) { '483' }
+
+          it 'raises FrederickAPI::V2::Errors::Error' do
+            expect { requestor.send(:handle_errors, result) }.to raise_error FrederickAPI::V2::Errors::Error
+          end
+        end
+
+        context 'error has no status' do
+          let(:status) { nil }
+
+          it 'raises FrederickAPI::V2::Errors::Error' do
+            expect { requestor.send(:handle_errors, result) }.to raise_error FrederickAPI::V2::Errors::Error
+          end
+        end
+      end
+    end
+
+    context 'with a Resource' do
+      let(:result) { instance_double(FrederickAPI::V2::Resource) }
+
+      before { expect(result).to receive(:has_errors?).and_return has_errors }
+
+      context 'no errors' do
+        it 'returns result' do
+          expect(requestor.send(:handle_errors, result)).to be(result)
+        end
+      end
+
+      context 'has errors' do
+        let(:has_errors) { true }
+        let(:errors) { instance_double(JsonApiClient::ErrorCollector) }
+        let(:error) { instance_double(JsonApiClient::ErrorCollector::Error) }
+
+        before do
+          allow(result).to receive(:errors).and_return errors
+          allow(errors).to receive(:first).and_return error
+          allow(error).to receive(:[]).with(:status).and_return status
+        end
+
+        context 'error has a known status' do
+          let(:status) { '400' }
+
+          it 'raises correct error' do
+            expect { requestor.send(:handle_errors, result) }.to raise_error FrederickAPI::V2::Errors::BadRequest
+          end
+        end
+
+        context 'error has a unanticipated status' do
+          let(:status) { '483' }
+
+          it 'raises FrederickAPI::V2::Errors::Error' do
+            expect { requestor.send(:handle_errors, result) }.to raise_error FrederickAPI::V2::Errors::Error
+          end
+        end
+
+        context 'error has no status' do
+          let(:status) { nil }
+
+          it 'raises FrederickAPI::V2::Errors::Error' do
+            expect { requestor.send(:handle_errors, result) }.to raise_error FrederickAPI::V2::Errors::Error
+          end
+        end
+      end
+    end
+  end
+
   describe '#request' do
     let(:error) {}
     let(:type) { 'type' }
@@ -51,9 +151,10 @@
     let(:request_args) { [type, path, param] }
     let(:super_instance) { superklass.new(String) }
     let(:super_request_call_args) { [] }
-    let(:request_return) { 'request_return' }
+    let(:request_return) { instance_double(JsonApiClient::ResultSet) }
 
     before do
+      allow(request_return).to receive(:has_errors?).and_return false
       allow_any_instance_of(superklass).to receive(:request) do |*args|
         super_request_call_args << args[1..-1]
         raise(error) if super_request_call_args.length == 1 && error
diff --git a/spec/frederick_api/v2/resource_spec.rb b/spec/frederick_api/v2/resource_spec.rb
index 27ff24b..4175884 100644
--- a/spec/frederick_api/v2/resource_spec.rb
+++ b/spec/frederick_api/v2/resource_spec.rb
@@ -45,6 +45,22 @@
     end
   end
 
+  describe '#has_errors?' do
+    context 'no errors' do
+      it 'false' do
+        expect(instance.has_errors?).to be false
+      end
+    end
+
+    context 'with errors' do
+      before { allow(instance).to receive(:errors).and_return 'some errors' }
+
+      it 'true' do
+        expect(instance.has_errors?).to be true
+      end
+    end
+  end
+
   describe '.all_records' do
     let(:result_set) { JsonApiClient::ResultSet.new }
     let(:paginator) { FrederickAPI::V2::Helpers::Paginator.new(result_set, {}) }
diff --git a/spec/integration/v2/resource_spec.rb b/spec/integration/v2/resource_spec.rb
index 423ac6f..d2ad6cf 100644
--- a/spec/integration/v2/resource_spec.rb
+++ b/spec/integration/v2/resource_spec.rb
@@ -45,17 +45,45 @@
 
   describe 'GET index' do
     context 'with no query params' do
+      let(:resp) do
+        {
+          status: 200,
+          headers: {
+            content_type: 'application/vnd.api+json'
+          },
+          body: {
+            data: [
+              {
+                'id': id,
+                'type': 'users',
+                'links': {},
+                'attributes': {
+                  'email': 'foo@example.com'
+                },
+                'relationships': {}
+              }
+            ]
+          }.to_json
+        }
+      end
+
       before do
         stub_request(:get, base_url)
-          .with(headers: request_headers)
-        resource.with_access_token(access_token) { resource.all }
+          .with(headers: request_headers).to_return(resp)
       end
 
       it 'makes GET request' do
+        resource.with_access_token(access_token) { resource.all }
         expect(
           a_request(:get, base_url)
         ).to have_been_made.once
       end
+
+      it 'returns data' do
+        expect(
+          resource.with_access_token(access_token) { resource.all }.first
+        ).to be_a FrederickAPI::V2::User
+      end
     end
 
     context 'with query params' do
@@ -175,6 +203,72 @@
         end
       end
     end
+
+    context 'bad request error' do
+      let(:resp) do
+        {
+          status: 400,
+          headers: {
+            content_type: 'application/vnd.api+json'
+          },
+          body: {
+            'errors' => [
+              {
+                'title' => 'property `not_a_real_contact_property` does not exist',
+                'detail' => 'properties - property `not_a_real_contact_property` does not exist',
+                'code' => '100',
+                'source' => { 'pointer' => '/data/attributes/properties' },
+                'status' => '400'
+              }
+            ]
+          }.to_json
+        }
+      end
+
+      before do
+        stub_request(:get, base_url)
+          .with(headers: request_headers).to_return(resp)
+      end
+
+      it 'raises' do
+        expect do
+          resource.with_access_token(access_token) { resource.all }.first
+        end.to raise_error FrederickAPI::V2::Errors::BadRequest
+      end
+    end
+
+    context 'unprocessable entity error' do
+      let(:resp) do
+        {
+          status: 422,
+          headers: {
+            content_type: 'application/vnd.api+json'
+          },
+          body: {
+            'errors' => [
+              {
+                'title' => 'property `not_a_real_contact_property` does not exist',
+                'detail' => 'properties - property `not_a_real_contact_property` does not exist',
+                'code' => '100',
+                'source' => { 'pointer' => '/data/attributes/properties' },
+                'status' => '422'
+              }
+            ]
+          }.to_json
+        }
+      end
+
+      before do
+        stub_request(:get, base_url)
+          .with(headers: request_headers).to_return(resp)
+      end
+
+      it 'raises' do
+        expect do
+          resource.with_access_token(access_token) { resource.all }.first
+        end.to raise_error FrederickAPI::V2::Errors::UnprocessableEntity
+      end
+    end
   end
 
   describe 'PATCH' do