diff --git a/.changes/nextrelease/endpointv2-updates.json b/.changes/nextrelease/endpointv2-updates.json
new file mode 100644
index 0000000000..fe59718a01
--- /dev/null
+++ b/.changes/nextrelease/endpointv2-updates.json
@@ -0,0 +1,7 @@
+[
+  {
+    "type": "enhancement",
+    "category": "EndpointV2",
+    "description": "Adds support for `StringArray` endpoint parameters and `operationContextParams`"
+  }
+]
diff --git a/src/Api/Operation.php b/src/Api/Operation.php
index cee94ac7c8..36ba3950cb 100644
--- a/src/Api/Operation.php
+++ b/src/Api/Operation.php
@@ -11,6 +11,7 @@ class Operation extends AbstractModel
     private $errors;
     private $staticContextParams = [];
     private $contextParams;
+    private $operationContextParams = [];
 
     public function __construct(array $definition, ShapeMap $shapeMap)
     {
@@ -28,6 +29,10 @@ public function __construct(array $definition, ShapeMap $shapeMap)
             $this->staticContextParams = $definition['staticContextParams'];
         }
 
+        if (isset($definition['operationContextParams'])) {
+            $this->operationContextParams = $definition['operationContextParams'];
+        }
+
         parent::__construct($definition, $shapeMap);
         $this->contextParams = $this->setContextParams();
     }
@@ -124,6 +129,17 @@ public function getContextParams()
         return $this->contextParams;
     }
 
+    /**
+     * Gets definition of modeled dynamic values used
+     * for endpoint resolution
+     *
+     * @return array
+     */
+    public function getOperationContextParams(): array
+    {
+        return $this->operationContextParams;
+    }
+
     private function setContextParams()
     {
         $members = $this->getInput()->getMembers();
diff --git a/src/ClientSideMonitoring/ApiCallMonitoringMiddleware.php b/src/ClientSideMonitoring/ApiCallMonitoringMiddleware.php
index 0a5abdac3a..420807384d 100644
--- a/src/ClientSideMonitoring/ApiCallMonitoringMiddleware.php
+++ b/src/ClientSideMonitoring/ApiCallMonitoringMiddleware.php
@@ -13,7 +13,6 @@
  */
 class ApiCallMonitoringMiddleware extends AbstractMonitoringMiddleware
 {
-
     /**
      * Api Call Attempt event keys for each Api Call event key
      *
diff --git a/src/EndpointV2/EndpointV2Middleware.php b/src/EndpointV2/EndpointV2Middleware.php
index e3070a7d90..b1628bcb47 100644
--- a/src/EndpointV2/EndpointV2Middleware.php
+++ b/src/EndpointV2/EndpointV2Middleware.php
@@ -7,6 +7,7 @@
 use Aws\CommandInterface;
 use Closure;
 use GuzzleHttp\Promise\Promise;
+use function JmesPath\search;
 
 /**
  * Handles endpoint rule evaluation and endpoint resolution.
@@ -137,9 +138,14 @@ private function resolveArgs(array $commandArgs, Operation $operation): array
         $contextParams = $this->bindContextParams(
             $commandArgs, $operation->getContextParams()
         );
+        $operationContextParams = $this->bindOperationContextParams(
+            $commandArgs,
+            $operation->getOperationContextParams()
+        );
 
         return array_merge(
             $this->clientArgs,
+            $operationContextParams,
             $contextParams,
             $staticContextParams,
             $endpointCommandArgs
@@ -231,6 +237,33 @@ private function bindContextParams(
         return $scopedParams;
     }
 
+    /**
+     * Binds context params to their corresponding values found in
+     * command arguments.
+     *
+     * @param array $commandArgs
+     * @param array $contextParams
+     *
+     * @return array
+     */
+    private function bindOperationContextParams(
+        array $commandArgs,
+        array $operationContextParams
+    ): array
+    {
+        $scopedParams = [];
+
+        foreach($operationContextParams as $name => $spec) {
+            $scopedValue = search($spec['path'], $commandArgs);
+
+            if ($scopedValue) {
+                $scopedParams[$name] = $scopedValue;
+            }
+        }
+
+        return $scopedParams;
+    }
+
     /**
      * Applies resolved auth schemes to the command object.
      *
diff --git a/src/EndpointV2/Ruleset/RulesetParameter.php b/src/EndpointV2/Ruleset/RulesetParameter.php
index b7cd107616..1a3322cd1b 100644
--- a/src/EndpointV2/Ruleset/RulesetParameter.php
+++ b/src/EndpointV2/Ruleset/RulesetParameter.php
@@ -3,6 +3,7 @@
 namespace Aws\EndpointV2\Ruleset;
 
 use Aws\Exception\UnresolvedEndpointException;
+use function \Aws\is_associative;
 
 /**
  * Houses properties of an individual parameter definition.
@@ -30,6 +31,13 @@ class RulesetParameter
     /** @var boolean */
     private $deprecated;
 
+    /** @var array<string, string> */
+    private static $typeMap = [
+        'String' => 'is_string',
+        'Boolean' => 'is_bool',
+        'StringArray' => 'isStringArray'
+    ];
+
     public function __construct($name, array $definition)
     {
         $type = ucfirst($definition['type']);
@@ -38,18 +46,16 @@ public function __construct($name, array $definition)
         } else {
             throw new UnresolvedEndpointException(
                 'Unknown parameter type ' . "`{$type}`" .
-                '. Parameters must be of type `String` or `Boolean`.'
+                '. Parameters must be of type `String`, `Boolean` or `StringArray.'
             );
         }
+
         $this->name = $name;
-        $this->builtIn = isset($definition['builtIn']) ? $definition['builtIn'] : null;
-        $this->default = isset($definition['default']) ? $definition['default'] : null;
-        $this->required =  isset($definition['required']) ?
-            $definition['required'] : false;
-        $this->documentation =  isset($definition['documentation']) ?
-            $definition['documentation'] : null;
-        $this->deprecated =  isset($definition['deprecated']) ?
-            $definition['deprecated'] : false;
+        $this->builtIn = $definition['builtIn'] ?? null;
+        $this->default = $definition['default'] ?? null;
+        $this->required = $definition['required'] ?? false;
+        $this->documentation = $definition['documentation'] ?? null;
+        $this->deprecated = $definition['deprecated'] ?? false;
     }
 
     /**
@@ -116,12 +122,7 @@ public function getDeprecated()
      */
     public function validateInputParam($inputParam)
     {
-        $typeMap = [
-            'String' => 'is_string',
-            'Boolean' => 'is_bool'
-        ];
-
-        if ($typeMap[$this->type]($inputParam) === false) {
+        if (!$this->isValidInput($inputParam)) {
             throw new UnresolvedEndpointException(
                 "Input parameter `{$this->name}` is the wrong type. Must be a {$this->type}."
             );
@@ -130,12 +131,15 @@ public function validateInputParam($inputParam)
         if ($this->deprecated) {
             $deprecated = $this->deprecated;
             $deprecationString = "{$this->name} has been deprecated ";
-            $msg = isset($deprecated['message']) ? $deprecated['message'] : null;
-            $since = isset($deprecated['since']) ? $deprecated['since'] : null;
+            $msg = $deprecated['message'] ?? null;
+            $since = $deprecated['since'] ?? null;
 
-            if (!is_null($since)) $deprecationString = $deprecationString
-                . 'since '. $since . '. ';
-            if (!is_null($msg)) $deprecationString = $deprecationString . $msg;
+            if (!is_null($since)){
+                $deprecationString .= 'since ' . $since . '. ';
+            }
+            if (!is_null($msg)) {
+                $deprecationString .= $msg;
+            }
 
             trigger_error($deprecationString, E_USER_WARNING);
         }
@@ -143,6 +147,33 @@ public function validateInputParam($inputParam)
 
     private function isValidType($type)
     {
-        return in_array($type, ['String', 'Boolean']);
+        return isset(self::$typeMap[$type]);
+    }
+
+    private function isValidInput($inputParam): bool
+    {
+        $method = self::$typeMap[$this->type];
+        if (is_callable($method)) {
+            return $method($inputParam);
+        } elseif (method_exists($this, $method)) {
+            return $this->$method($inputParam);
+        }
+
+        return false;
+    }
+
+    private function isStringArray(array $array): bool
+    {
+        if (is_associative($array)) {
+            return false;
+        }
+
+        foreach($array as $value) {
+            if (!is_string($value)) {
+                return false;
+            }
+        }
+
+        return true;
     }
 }
diff --git a/src/EndpointV2/Ruleset/RulesetStandardLibrary.php b/src/EndpointV2/Ruleset/RulesetStandardLibrary.php
index 2705ff997e..910bc5a472 100644
--- a/src/EndpointV2/Ruleset/RulesetStandardLibrary.php
+++ b/src/EndpointV2/Ruleset/RulesetStandardLibrary.php
@@ -61,6 +61,13 @@ public function not($value)
      */
     public function getAttr($from, $path)
     {
+        // Handles the case where "[<int|string]" is provided as the top-level path
+        if (preg_match('/^\[(\w+)\]$/', $path, $matches)) {
+            $index = is_numeric($matches[1]) ? (int) $matches[1] : $matches[1];
+
+            return $from[$index] ?? null;
+        }
+
         $parts = explode('.', $path);
         foreach ($parts as $part) {
             $sliceIdx = strpos($part, '[');
@@ -68,10 +75,9 @@ public function getAttr($from, $path)
                 if (substr($part, -1) !== ']') {
                     return null;
                 }
-                $slice = intval(substr($part, $sliceIdx + 1, strlen($part) - 1));
-                $from = isset($from[substr($part,0, $sliceIdx)][$slice])
-                    ? $from[substr($part,0, $sliceIdx)][$slice]
-                    : null;
+                $slice = (int) substr($part, $sliceIdx + 1, strlen($part) - 1);
+                $fromIndex = substr($part, 0, $sliceIdx);
+                $from = $from[$fromIndex][$slice] ?? null;
             } else {
                 $from = $from[$part];
             }
diff --git a/src/functions.php b/src/functions.php
index 4533728021..5f4d98ad5a 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -603,3 +603,23 @@ function strip_fips_pseudo_regions($region)
     return str_replace(['fips-', '-fips'], ['', ''], $region);
 }
 
+/**
+ * Checks if an array is associative
+ *
+ * @param array $array
+ *
+ * @return bool
+ */
+function is_associative(array $array): bool
+{
+    if (empty($array)) {
+        return false;
+    }
+
+    if (function_exists('array_is_list')) {
+        return !array_is_list($array);
+    }
+
+    return array_keys($array) !== range(0, count($array) - 1);
+}
+
diff --git a/tests/Api/OperationTest.php b/tests/Api/OperationTest.php
index d01ba004e0..76c393779e 100644
--- a/tests/Api/OperationTest.php
+++ b/tests/Api/OperationTest.php
@@ -131,4 +131,44 @@ public function testGetContextParams()
            $contextParams
         );
     }
+
+    public function testGetOperationContextParams()
+    {
+        $definition = [
+            "input" => ["shape" => "ListOfObjectsOperationRequest"],
+            "operationContextParams" => [
+                "stringArrayParam" => [
+                    "path" => "nested.listOfObjects[*].key"
+                ]
+            ],
+            "http" => [
+                "method" => "POST",
+                "requestUri" => "/"
+            ]
+        ];
+        $operation = new Operation(
+            $definition,
+            new ShapeMap([
+                "ListOfObjectsOperationRequest" => [
+                    "type" => "structure",
+                    "members" => [
+                        "nested" => ["shape" => "Nested"]
+                    ]
+                ],
+                "Nested" => [
+                    "type" => "structure",
+                    "members" => [
+                        "listOfObjects" => ["shape" => "ListOfObjects"]
+                    ]
+                ],
+                "ListOfObjects" => [
+                    "type" => "list",
+                    "member" => ["shape" => "ObjectMember"]
+                ]
+            ])
+        );
+
+        $operationContextParams = $operation->getOperationContextParams();
+        $this->assertSame($definition['operationContextParams'], $operationContextParams);
+    }
 }
diff --git a/tests/EndpointV2/EndpointProviderV2Test.php b/tests/EndpointV2/EndpointProviderV2Test.php
index 09e5b7fcf4..c0b4f91f38 100644
--- a/tests/EndpointV2/EndpointProviderV2Test.php
+++ b/tests/EndpointV2/EndpointProviderV2Test.php
@@ -1,7 +1,9 @@
 <?php
 namespace Aws\Test\EndpointV2;
 
+use Aws\Api\Service;
 use Aws\Auth\Exception\UnresolvedAuthSchemeException;
+use Aws\AwsClient;
 use Aws\Credentials\Credentials;
 use Aws\EndpointV2\EndpointDefinitionProvider;
 use Aws\EndpointV2\EndpointProviderV2;
@@ -40,7 +42,8 @@ public function basicTestCaseProvider()
             "parse-url",
             "substring",
             "uri-encode",
-            "valid-hostlabel"
+            "valid-hostlabel",
+            "string-array"
         ];
         $providerCases = [];
 
@@ -64,6 +67,7 @@ public function basicTestCaseProvider()
                 $providerCases[] = $providerCase;
             }
         }
+
         return $providerCases;
     }
 
@@ -127,6 +131,7 @@ public function serviceTestCaseProvider()
                 $serviceTestCases[] = $testCase;
             }
         }
+
         return $serviceTestCases;
     }
 
@@ -372,4 +377,77 @@ public function testCachesEndpointObject()
         $endpointProvider->resolveEndpoint(['Region' => 'us-west-2']);
         $endpointProvider->resolveEndpoint(['Region' => 'us-west-2']);
     }
+
+    /**
+     * @dataProvider stringArrayOperationInputsProvider
+     * @return void
+     */
+    public function testStringArrayOperationInputs(
+        $params,
+        $expected,
+        $operationInputs
+    )
+    {
+        if (isset($expected['error'])) {
+            $this->expectException(UnresolvedEndpointException::class);
+            $this->expectExceptionMessage($expected['error']);
+        }
+
+        $serviceDefinition = json_decode(file_get_contents(
+            __DIR__ . '/service-models/string-array.json'
+        ), true);
+        $service = new Service($serviceDefinition, function () {
+            return [];
+        });
+        $client = new AwsClient([
+            'service' => 'foo',
+            'api_provider' => function () use ($service) {
+                return $service->toArray();
+            },
+            'region' => 'bar',
+            'endpoint_provider' => new EndpointProviderV2(
+                json_decode(
+                    file_get_contents(
+                    __DIR__ . '/valid-rules/string-array.json'),
+                    true
+                    ),
+                EndpointDefinitionProvider::getPartitions()
+            )
+        ]);
+
+        $list = $client->getHandlerList();
+        if (!isset($expected['error'])) {
+            $list->appendSign(Middleware::tap(function($cmd, $req) use ($service, $expected) {
+                $this->assertEquals(
+                    $expected['endpoint']['url'],
+                    (string) $req->getUri()
+                );
+            }));
+        }
+
+        foreach($operationInputs as $operation) {
+            $this->addMockResults($client, [[]]);
+            $command = $client->getCommand(
+                $operation['operationName'],
+                $operation['operationParams'] ?? []
+            );
+            $client->execute($command);
+        }
+    }
+
+    public function stringArrayOperationInputsProvider()
+    {
+        $cases = json_decode(
+            file_get_contents(__DIR__ . '/test-cases/string-array.json'),
+            true
+        );
+        $providerCases = [];
+
+        foreach ($cases['testCases'] as $case) {
+            unset($case['documentation']);
+            $providerCases[] = $case;
+        }
+
+        return $providerCases;
+    }
 }
diff --git a/tests/EndpointV2/RulesetParameterTest.php b/tests/EndpointV2/RulesetParameterTest.php
index 2300c8d430..aeab9340df 100644
--- a/tests/EndpointV2/RulesetParameterTest.php
+++ b/tests/EndpointV2/RulesetParameterTest.php
@@ -10,21 +10,6 @@
  */
 class RulesetParameterTest extends TestCase
 {
-    private $rulesetParameter;
-
-    protected function set_up()
-    {
-        $spec = [
-            "type" => "string",
-            "builtIn" => "AWS::Region",
-            "deprecated" => [
-                "since" => 'then',
-                "message" => 'There is a new parameter.'
-            ]
-        ];
-        $this->rulesetParameter = new RulesetParameter('Region' ,$spec);
-    }
-
     public function wrongParameterTypeProvider()
     {
         return [
@@ -46,7 +31,11 @@ public function testWrongParameterTypeThrowsException($inputParameter)
             "Input parameter `Region` is the wrong type. Must be a String."
         );
 
-        $this->rulesetParameter->validateInputParam($inputParameter);
+        $parameter = $this->createTestParameter('Region', [
+            "type" => "string",
+            "builtIn" => "AWS::Region"
+        ]);
+        $parameter->validateInputParam($inputParameter);
     }
 
     public function testDeprecatedParameterLogsError()
@@ -55,19 +44,67 @@ public function testDeprecatedParameterLogsError()
         $this->expectExceptionMessage(
             'Region has been deprecated since then. There is a new parameter.'
         );
-        $this->rulesetParameter->validateInputParam('us-east-1');
+        $parameter = new RulesetParameter('Region', [
+            "type" => "string",
+            "builtIn" => "AWS::Region",
+            "deprecated" => [
+                "since" => 'then',
+                "message" => 'There is a new parameter.'
+            ]
+        ]);
+        $parameter->validateInputParam('us-east-1');
     }
 
-    public function testUnknownTypeThrowsException() {
+    public function testUnknownTypeThrowsException()
+    {
         $parameterSpec = [
             'type' => 'tuple'
         ];
         $this->expectException(UnresolvedEndpointException::class);
         $this->expectExceptionMessage(
             'Unknown parameter type `Tuple`. ' .
-                'Parameters must be of type `String` or `Boolean`.'
+                'Parameters must be of type `String`, `Boolean` or `StringArray.'
         );
 
         $rulesetParameter = new RulesetParameter('invalidType', $parameterSpec);
     }
+
+    public function testGetDefault()
+    {
+        $spec = [
+            "type" => "stringArray",
+            "default" => ['foo', 'bar']
+        ];
+        $ruleset = new RulesetParameter('FooStringArray', $spec);
+        $this->assertSame($spec['default'], $ruleset->getDefault());
+    }
+
+    /**
+     * @dataProvider validTypesProvider
+     * @doesNotPerformAssertions
+     */
+    public function testRulesetCreationWithValidTypes($spec)
+    {
+        new RulesetParameter('FooParam', $spec);
+    }
+
+    public function validTypesProvider()
+    {
+        return [
+            [
+                ["type" => "string",]
+            ],
+            [
+                ["type" => "boolean",]
+            ],
+            [
+                ["type" => "stringArray",]
+            ],
+        ];
+    }
+
+    private function createTestParameter($name, $spec)
+    {
+        return new RulesetParameter($name, $spec);
+    }
 }
diff --git a/tests/EndpointV2/RulesetStandardLibraryTest.php b/tests/EndpointV2/RulesetStandardLibraryTest.php
index 35c156a533..da3275c169 100644
--- a/tests/EndpointV2/RulesetStandardLibraryTest.php
+++ b/tests/EndpointV2/RulesetStandardLibraryTest.php
@@ -69,9 +69,10 @@ public function testNot($input, $expected)
     public function getAttrProvider()
     {
         return [
-            ["Thing1", "foo"],
-            ["Thing2[0]", "index0"],
-            ["Thing3.SubThing", 42],
+            ['{"Thing1": "foo", "Thing2": ["index0", "index1"], "Thing3": {"SubThing": 42}}', "Thing1", "foo"],
+            ['{"Thing1": "foo", "Thing2": ["index0", "index1"], "Thing3": {"SubThing": 42}}', "Thing2[0]", "index0"],
+            ['{"Thing1": "foo", "Thing2": ["index0", "index1"], "Thing3": {"SubThing": 42}}', "Thing3.SubThing", 42],
+            ['["index0", "index1"]', "[0]", 'index0']
         ];
     }
 
@@ -81,9 +82,9 @@ public function getAttrProvider()
      * @param $path
      * @param $expected
      */
-    public function testGetAttr($path, $expected)
+    public function testGetAttr($from, $path, $expected)
     {
-        $from = json_decode('{"Thing1": "foo", "Thing2": ["index0", "index1"], "Thing3": {"SubThing": 42}}', true);
+        $from = json_decode($from, true);
         $this->assertSame($expected, $this->standardLibrary->getAttr($from, $path));
     }
 
diff --git a/tests/EndpointV2/service-models/string-array.json b/tests/EndpointV2/service-models/string-array.json
new file mode 100644
index 0000000000..74dadae687
--- /dev/null
+++ b/tests/EndpointV2/service-models/string-array.json
@@ -0,0 +1,107 @@
+{
+  "metadata": {
+    "endpointPrefix": "svcname",
+    "serviceId": "sample_svc",
+    "jsonVersion":"1.1",
+    "protocol":"json"
+  },
+  "operations": {
+    "NoBindingsOperation": {
+      "input": { "shape": "EmptyOperationRequest" },
+      "http": {
+        "method": "POST",
+        "requestUri": "/"
+      }
+    },
+    "EmptyStaticContextOperation": {
+      "input": { "shape": "EmptyOperationRequest" },
+      "staticContextParams": {
+        "stringArrayParam": {
+          "value": []
+        }
+      },
+      "http": {
+        "method": "POST",
+        "requestUri": "/"
+      }
+    },
+    "StaticContextOperation": {
+      "input": { "shape": "EmptyOperationRequest" },
+      "staticContextParams": {
+        "stringArrayParam": {
+          "value": ["staticValue1"]
+        }
+      },
+      "http": {
+        "method": "POST",
+        "requestUri": "/"
+      }
+    },
+    "ListOfObjectsOperation": {
+      "input": { "shape": "ListOfObjectsOperationRequest" },
+      "operationContextParams": {
+        "stringArrayParam": {
+          "path": "nested.listOfObjects[*].key"
+        }
+      },
+      "http": {
+        "method": "POST",
+        "requestUri": "/"
+      }
+    },
+    "MapOperation": {
+      "input": { "shape": "MapOperationRequest" },
+      "operationContextParams": {
+        "stringArrayParam": {
+          "path": "keys(map)"
+        }
+      },
+      "http": {
+        "method": "POST",
+        "requestUri": "/"
+      }
+    }
+  },
+  "shapes": {
+    "EmptyOperationRequest": {
+      "type": "structure",
+      "members": {}
+    },
+    "ListOfObjectsOperationRequest": {
+      "type": "structure",
+      "members": {
+        "nested":{"shape":"Nested"}
+      }
+    },
+    "Nested": {
+      "type": "structure",
+      "members": {
+        "listOfObjects":{"shape":"ListOfObjects"}
+      }
+    },
+    "ListOfObjects": {
+      "type": "list",
+      "member":{"shape":"ObjectMember"}
+    },
+    "ObjectMember": {
+      "type": "structure",
+      "members": {
+        "key":{"shape":"String"}
+      }
+    },
+    "MapOperationRequest": {
+      "type": "structure",
+      "members": {
+        "map":{"shape":"Map"}
+      }
+    },
+    "Map":{
+      "type":"map",
+      "key":{"shape":"String"},
+      "value":{"shape":"String"}
+    },
+    "String":{
+      "type":"string"
+    }
+  }
+}
diff --git a/tests/EndpointV2/test-cases/string-array.json b/tests/EndpointV2/test-cases/string-array.json
new file mode 100644
index 0000000000..31272fb114
--- /dev/null
+++ b/tests/EndpointV2/test-cases/string-array.json
@@ -0,0 +1,82 @@
+{
+  "version": "1.0",
+  "testCases": [
+    {
+      "documentation": "Default array values used",
+      "params": {},
+      "expect": {
+        "endpoint": {
+          "url": "https://example.com/defaultValue1"
+        }
+      },
+      "operationInputs": [
+        {
+          "operationName": "NoBindingsOperation"
+        }
+      ]
+    },
+    {
+      "documentation": "Empty array",
+      "params": {
+        "stringArrayParam": []
+      },
+      "expect": {
+        "error": "no array values set"
+      },
+      "operationInputs": [
+        {
+          "operationName": "EmptyStaticContextOperation"
+        }
+      ]
+    },
+    {
+      "documentation": "Static value",
+      "params": {
+        "stringArrayParam": ["staticValue1"]
+      },
+      "expect": {
+        "endpoint": {
+          "url": "https://example.com/staticValue1"
+        }
+      },
+      "operationInputs": [
+        {
+          "operationName": "StaticContextOperation"
+        }
+      ]
+    },
+    {
+      "documentation": "bound value from input",
+      "params": {
+        "stringArrayParam": ["key1"]
+      },
+      "expect": {
+        "endpoint": {
+          "url": "https://example.com/key1"
+        }
+      },
+      "operationInputs": [
+        {
+          "operationName": "ListOfObjectsOperation",
+          "operationParams": {
+            "nested": {
+              "listOfObjects": [
+                {
+                  "key": "key1"
+                }
+              ]
+            }
+          }
+        },
+        {
+          "operationName": "MapOperation",
+          "operationParams": {
+            "map": {
+              "key1": "value1"
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/EndpointV2/valid-rules/string-array.json b/tests/EndpointV2/valid-rules/string-array.json
new file mode 100644
index 0000000000..913b557be7
--- /dev/null
+++ b/tests/EndpointV2/valid-rules/string-array.json
@@ -0,0 +1,38 @@
+{
+  "version": "1.0",
+  "parameters": {
+    "stringArrayParam": {
+      "type": "stringArray",
+      "required": true,
+      "default": ["defaultValue1", "defaultValue2"],
+      "documentation": "docs"
+    }
+  },
+  "rules": [
+    {
+      "documentation": "Template first array value into URI if set",
+      "conditions": [
+        {
+          "fn": "getAttr",
+          "argv": [
+            {
+              "ref": "stringArrayParam"
+            },
+            "[0]"
+          ],
+          "assign": "arrayValue"
+        }
+      ],
+      "endpoint": {
+        "url": "https://example.com/{arrayValue}"
+      },
+      "type": "endpoint"
+    },
+    {
+      "conditions": [],
+      "documentation": "error fallthrough",
+      "error": "no array values set",
+      "type": "error"
+    }
+  ]
+}
diff --git a/tests/FunctionsTest.php b/tests/FunctionsTest.php
index f430f10272..a4d838096a 100644
--- a/tests/FunctionsTest.php
+++ b/tests/FunctionsTest.php
@@ -516,4 +516,30 @@ public function getIniFileServiceTestCases()
             ]
         ];
     }
+
+    /**
+     * @param $array
+     * @param $expected
+     *
+     * @dataProvider isAssociativeProvider
+     */
+    public function testIsAssociative($array, $expected)
+    {
+        $result = Aws\is_associative($array);
+        $this->assertEquals($expected, $result);
+    }
+
+    public function isAssociativeProvider()
+    {
+        return [
+           [[], false],
+           [['foo' => 'bar'], true],
+           [[1, 2, 3, 5], false],
+           [['foo', 'bar', 'baz'], false],
+           [['1' => 1, '2' => 2, '3'], true],
+           [['0' => 0, '1' => 2], false],
+           [[0 => 1, 1 => 2], false],
+           [[1 => 0, 2 => 2], true],
+        ];
+    }
 }