diff --git a/kompendium/build.gradle.kts b/kompendium/build.gradle.kts
index e065cdfe4..839d16d05 100644
--- a/kompendium/build.gradle.kts
+++ b/kompendium/build.gradle.kts
@@ -8,4 +8,5 @@ dependencies {
   implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
   testImplementation("org.jetbrains.kotlin:kotlin-test")
   testImplementation("org.jetbrains.kotlin:kotlin-test-junit")
+  testImplementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.12.0")
 }
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfo.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfo.kt
index 5987b3dc2..0789e5e42 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfo.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfo.kt
@@ -6,7 +6,7 @@ data class OpenApiSpecInfo(
   val title: String,
   val version: String,
   val description: String?,
-  val termsOfService: URI?,
-  val contact: OpenApiSpecInfoContact?,
-  val license: OpenApiSpecInfoLicense?
+  val termsOfService: URI? = null,
+  val contact: OpenApiSpecInfoContact? = null,
+  val license: OpenApiSpecInfoLicense? = null
 )
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfoContact.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfoContact.kt
index c8d57eea5..a478ea1be 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfoContact.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecInfoContact.kt
@@ -4,6 +4,6 @@ import java.net.URI
 
 data class OpenApiSpecInfoContact(
   val name: String,
-  val url: URI?,
-  val email: String? // TODO Enforce email
+  val url: URI? = null,
+  val email: String? = null // TODO Enforce email?
 )
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecMediaType.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecMediaType.kt
index 2d09bdb1c..b73369226 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecMediaType.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecMediaType.kt
@@ -2,8 +2,8 @@ package org.leafygreens.kompendium.models
 
 // TODO Oof -> https://swagger.io/specification/#media-type-object
 data class OpenApiSpecMediaType(
-  val schema: String, // TODO sheesh -> https://swagger.io/specification/#schema-object needs to be referencable
-  val example: String, // TODO Enforce type? then serialize?
-  val examples: Map<String, String>, // needs to be mutually exclusive with example
-  val encoding: Map<String, String> // todo encoding object -> https://swagger.io/specification/#encoding-object
+  val schema: OpenApiSpecReferencable, // TODO sheesh -> https://swagger.io/specification/#schema-object needs to be referencable
+  val example: String? = null, // TODO Enforce type? then serialize?
+  val examples: Map<String, String>? = null, // needs to be mutually exclusive with example
+  val encoding: Map<String, String>? = null // todo encoding object -> https://swagger.io/specification/#encoding-object
 )
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItem.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItem.kt
index da9e9bc58..3bef065b2 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItem.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItem.kt
@@ -1,17 +1,17 @@
 package org.leafygreens.kompendium.models
 
 data class OpenApiSpecPathItem(
-  val `$ref`: String?, // TODO Maybe drop this?
-  val summary: String?,
-  val description: String?,
-  val get: OpenApiSpecPathItemOperation?,
-  val put: OpenApiSpecPathItemOperation?,
-  val post: OpenApiSpecPathItemOperation?,
-  val delete: OpenApiSpecPathItemOperation?,
-  val options: OpenApiSpecPathItemOperation?,
-  val head: OpenApiSpecPathItemOperation?,
-  val patch: OpenApiSpecPathItemOperation?,
-  val trace: OpenApiSpecPathItemOperation?,
-  val servers: List<OpenApiSpecServer> = emptyList(),
-  val parameters: List<OpenApiSpecReferencable> = emptyList()
+  // val `$ref`: String?, // TODO need example of this... or just make whole thing referencable?
+  val summary: String? = null,
+  val description: String? = null,
+  val get: OpenApiSpecPathItemOperation? = null,
+  val put: OpenApiSpecPathItemOperation? = null,
+  val post: OpenApiSpecPathItemOperation? = null,
+  val delete: OpenApiSpecPathItemOperation? = null,
+  val options: OpenApiSpecPathItemOperation? = null,
+  val head: OpenApiSpecPathItemOperation? = null,
+  val patch: OpenApiSpecPathItemOperation? = null,
+  val trace: OpenApiSpecPathItemOperation? = null,
+  val servers: List<OpenApiSpecServer>? = null,
+  val parameters: List<OpenApiSpecReferencable>? = null
 )
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItemOperation.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItemOperation.kt
index f56606d09..8c6af4193 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItemOperation.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecPathItemOperation.kt
@@ -2,15 +2,16 @@ package org.leafygreens.kompendium.models
 
 data class OpenApiSpecPathItemOperation(
   val tags: Set<String> = emptySet(),
-  val summary: String?,
-  val description: String?,
-  val externalDocs: OpenApiSpecExternalDocumentation?,
-  val operationId: String?,
-  val parameters: List<OpenApiSpecReferencable> = emptyList(),
-  val requestBody: OpenApiSpecReferencable,
-  val responses: Map<String, OpenApiSpecReferencable>, // TODO How to enforce `default` requirement
-  val callbacks: Map<String, OpenApiSpecReferencable>,
+  val summary: String? = null,
+  val description: String? = null,
+  val externalDocs: OpenApiSpecExternalDocumentation? = null,
+  val operationId: String? = null,
+  val parameters: List<OpenApiSpecReferencable>? = null,
+  val requestBody: OpenApiSpecReferencable? = null,
+  val responses: Map<String, OpenApiSpecReferencable>? = null, // TODO How to enforce `default` requirement
+  val callbacks: Map<String, OpenApiSpecReferencable>? = null,
   val deprecated: Boolean = false,
-  val security: Map<String, String>, // todo needs to reference objects in the security scheme 🤔
-  val servers: List<OpenApiSpecServer>
+  val security: List<Map<String, List<String>>>? = null, // todo big yikes... also needs to reference objects in the security scheme 🤔
+  val servers: List<OpenApiSpecServer>? = null,
+  val `x-codegen-request-body-name`: String? = null
 )
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecReferencable.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecReferencable.kt
index 18131c8d2..206a3ec99 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecReferencable.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecReferencable.kt
@@ -9,10 +9,10 @@ data class OpenApiSpecCallback(
 ) : OpenApiSpecReferencable()
 
 data class OpenApiSpecResponse(
-  val description: String,
-  val headers: Map<String, OpenApiSpecReferencable>,
-  val content: Map<String, OpenApiSpecMediaType>,
-  val links: Map<String, OpenApiSpecReferencable>
+  val description: String? = null,
+  val headers: Map<String, OpenApiSpecReferencable>? = null,
+  val content: Map<String, OpenApiSpecMediaType>? = null,
+  val links: Map<String, OpenApiSpecReferencable>? = null
 ) : OpenApiSpecReferencable()
 
 data class OpenApiSpecHeader(
@@ -29,3 +29,9 @@ data class OpenApiSpecParameter(
   val deprecated: Boolean = false,
   val allowEmptyValue: Boolean = false
 ) : OpenApiSpecReferencable()
+
+data class OpenApiSpecRequest(
+  val description: String?,
+  val content: Map<String, OpenApiSpecMediaType>,
+  val required: Boolean = false
+) : OpenApiSpecReferencable()
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecRequest.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecRequest.kt
deleted file mode 100644
index f2721ed1b..000000000
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecRequest.kt
+++ /dev/null
@@ -1,7 +0,0 @@
-package org.leafygreens.kompendium.models
-
-data class OpenApiSpecRequest(
-  val description: String?,
-  val content: Map<String, OpenApiSpecMediaType>,
-  val required: Boolean = false
-)
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecServer.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecServer.kt
index 6b544448d..60fa659bb 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecServer.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecServer.kt
@@ -1,7 +1,9 @@
 package org.leafygreens.kompendium.models
 
+import java.net.URI
+
 data class OpenApiSpecServer(
-  val url: String,
-  val description: String?,
-  var variables: Map<String, OpenApiSpecServerVariable>?
+  val url: URI,
+  val description: String? = null,
+  var variables: Map<String, OpenApiSpecServerVariable>? = null
 )
diff --git a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTag.kt b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTag.kt
index 97a779c02..21c8c11e5 100644
--- a/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTag.kt
+++ b/kompendium/src/main/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTag.kt
@@ -2,6 +2,6 @@ package org.leafygreens.kompendium.models
 
 data class OpenApiSpecTag(
   val name: String,
-  val description: String?,
-  val externalDocs: OpenApiSpecExternalDocumentation?
+  val description: String? = null,
+  val externalDocs: OpenApiSpecExternalDocumentation? = null
 )
diff --git a/kompendium/src/test/kotlin/kompendium/LibraryTest.kt b/kompendium/src/test/kotlin/kompendium/LibraryTest.kt
index f732fe90f..0aff026b5 100644
--- a/kompendium/src/test/kotlin/kompendium/LibraryTest.kt
+++ b/kompendium/src/test/kotlin/kompendium/LibraryTest.kt
@@ -5,7 +5,6 @@ package kompendium
 
 import kotlin.test.Test
 import kotlin.test.assertEquals
-import kotlin.test.assertTrue
 
 class LibraryTest {
     @Test fun testSomeLibraryMethod() {
diff --git a/kompendium/src/test/kotlin/org/leafygreens/kompendium/KompendiumTest.kt b/kompendium/src/test/kotlin/org/leafygreens/kompendium/KompendiumTest.kt
new file mode 100644
index 000000000..b130eb281
--- /dev/null
+++ b/kompendium/src/test/kotlin/org/leafygreens/kompendium/KompendiumTest.kt
@@ -0,0 +1,14 @@
+package org.leafygreens.kompendium
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+internal class KompendiumTest {
+
+  @Test
+  fun `Kompendium can be instantiated with no details`() {
+    val kompendium = Kompendium()
+    assertEquals(kompendium.spec.openapi, "3.0.3", "Kompendium has a default spec version of 3.0.3")
+  }
+
+}
diff --git a/kompendium/src/test/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTest.kt b/kompendium/src/test/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTest.kt
new file mode 100644
index 000000000..cb17d3681
--- /dev/null
+++ b/kompendium/src/test/kotlin/org/leafygreens/kompendium/models/OpenApiSpecTest.kt
@@ -0,0 +1,27 @@
+package org.leafygreens.kompendium.models
+
+import com.fasterxml.jackson.annotation.JsonInclude
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import org.leafygreens.kompendium.util.TestData
+
+internal class OpenApiSpecTest {
+
+  private val mapper = jacksonObjectMapper()
+    .setSerializationInclusion(JsonInclude.Include.NON_NULL)
+    .writerWithDefaultPrettyPrinter()
+
+  @Test
+  fun `OpenApiSpec can be serialized into a valid Open API Spec`() {
+    // when
+    val spec = TestData.testSpec
+
+    // do
+    val json = mapper.writeValueAsString(spec)
+
+    // expect
+    val expected = TestData.getFileSnapshot("petstore.json").trim()
+    assertEquals(expected, json, "Should serialize an empty spec")
+  }
+}
diff --git a/kompendium/src/test/kotlin/org/leafygreens/kompendium/util/TestData.kt b/kompendium/src/test/kotlin/org/leafygreens/kompendium/util/TestData.kt
new file mode 100644
index 000000000..2741a47dd
--- /dev/null
+++ b/kompendium/src/test/kotlin/org/leafygreens/kompendium/util/TestData.kt
@@ -0,0 +1,145 @@
+package org.leafygreens.kompendium.util
+
+import java.io.File
+import java.net.URI
+import org.leafygreens.kompendium.models.OpenApiSpec
+import org.leafygreens.kompendium.models.OpenApiSpecExternalDocumentation
+import org.leafygreens.kompendium.models.OpenApiSpecInfo
+import org.leafygreens.kompendium.models.OpenApiSpecInfoContact
+import org.leafygreens.kompendium.models.OpenApiSpecInfoLicense
+import org.leafygreens.kompendium.models.OpenApiSpecMediaType
+import org.leafygreens.kompendium.models.OpenApiSpecPathItem
+import org.leafygreens.kompendium.models.OpenApiSpecPathItemOperation
+import org.leafygreens.kompendium.models.OpenApiSpecReferenceObject
+import org.leafygreens.kompendium.models.OpenApiSpecRequest
+import org.leafygreens.kompendium.models.OpenApiSpecResponse
+import org.leafygreens.kompendium.models.OpenApiSpecServer
+import org.leafygreens.kompendium.models.OpenApiSpecTag
+
+object TestData {
+  fun getFileSnapshot(fileName: String): String {
+    val snapshotPath = "src/test/resources"
+    val file = File("$snapshotPath/$fileName")
+    return file.readText()
+  }
+
+  val testSpec = OpenApiSpec(
+    info = OpenApiSpecInfo(
+      title = "Swagger Petstore",
+      description = "This is a sample server Petstore server.  You can find out more about     Swagger at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).      For this sample, you can use the api key `special-key` to test the authorization     filters.",
+      termsOfService = URI("http://swagger.io/terms/"),
+      contact = OpenApiSpecInfoContact(
+        name = "Team Swag",
+        email = "apiteam@swagger.io"
+      ),
+      license = OpenApiSpecInfoLicense(
+        name = "Apache 2.0",
+        url = URI("http://www.apache.org/licenses/LICENSE-2.0.html")
+      ),
+      version = "1.0.0"
+    ),
+    externalDocs = OpenApiSpecExternalDocumentation(
+      description = "Find out more about Swagger",
+      url = URI("http://swagger.io")
+    ),
+    servers = listOf(
+      OpenApiSpecServer(
+        url = URI("https://petstore.swagger.io/v2")
+      ),
+      OpenApiSpecServer(
+        url = URI("http://petstore.swagger.io/v2")
+      )
+    ),
+    tags = listOf(
+      OpenApiSpecTag(
+        name = "pet",
+        description = "Everything about your Pets",
+        externalDocs = OpenApiSpecExternalDocumentation(
+          description = "Find out more",
+          url = URI("http://swagger.io")
+        )
+      ),
+      OpenApiSpecTag(
+        name = "store",
+        description = "Access to Petstore orders"
+      ),
+      OpenApiSpecTag(
+        name = "user",
+        description = "Operations about user",
+        externalDocs = OpenApiSpecExternalDocumentation(
+          description = "Find out more about our store",
+          url = URI("http://swagger.io")
+        )
+      )
+    ),
+    paths = mapOf(
+      "/pet" to OpenApiSpecPathItem(
+        put = OpenApiSpecPathItemOperation(
+          tags = setOf("pet"),
+          summary = "Update an existing pet",
+          operationId = "updatePet",
+          requestBody = OpenApiSpecRequest(
+            description = "Pet object that needs to be added to the store",
+            content = mapOf(
+              "application/json" to OpenApiSpecMediaType(
+                schema = OpenApiSpecReferenceObject(`$ref` = "#/components/schemas/Pet")
+              ),
+              "application/xml" to OpenApiSpecMediaType(
+                schema = OpenApiSpecReferenceObject(`$ref` = "#/components/schemas/Pet")
+              )
+            ),
+            required = true
+          ),
+          responses = mapOf(
+            "400" to OpenApiSpecResponse(
+              description = "Invalid ID supplied",
+              content = emptyMap()
+            ),
+            "404" to OpenApiSpecResponse(
+              description = "Pet not found",
+              content = emptyMap()
+            ),
+            "405" to OpenApiSpecResponse(
+              description = "Validation exception",
+              content = emptyMap()
+            )
+          ),
+          security = listOf(
+            mapOf(
+              "petstore_auth" to listOf("write:pets", "read:pets")
+            )
+          ),
+          `x-codegen-request-body-name` = "body"
+        ),
+        post = OpenApiSpecPathItemOperation(
+          tags = setOf("pet"),
+          summary = "Add a new pet to the store",
+          operationId = "addPet",
+          requestBody = OpenApiSpecRequest(
+            description = "Pet object that needs to be added to the store",
+            content = mapOf(
+              "application/json" to OpenApiSpecMediaType(
+                schema = OpenApiSpecReferenceObject(`$ref` = "#/components/schemas/Pet")
+              ),
+              "application/xml" to OpenApiSpecMediaType(
+                schema = OpenApiSpecReferenceObject(`$ref` = "#/components/schemas/Pet")
+              )
+            )
+          ),
+          responses = mapOf(
+            "405" to OpenApiSpecResponse(
+              description = "Invalid Input",
+              content = emptyMap()
+            )
+          ),
+          security = listOf(
+            mapOf(
+              "petstore_auth" to listOf("write:pets", "read:pets")
+            )
+          ),
+          `x-codegen-request-body-name` = "body"
+        )
+      )
+    )
+  )
+}
diff --git a/kompendium/src/test/resources/petstore.json b/kompendium/src/test/resources/petstore.json
new file mode 100644
index 000000000..9ef6c103d
--- /dev/null
+++ b/kompendium/src/test/resources/petstore.json
@@ -0,0 +1,121 @@
+{
+  "openapi" : "3.0.3",
+  "info" : {
+    "title" : "Swagger Petstore",
+    "version" : "1.0.0",
+    "description" : "This is a sample server Petstore server.  You can find out more about     Swagger at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).      For this sample, you can use the api key `special-key` to test the authorization     filters.",
+    "termsOfService" : "http://swagger.io/terms/",
+    "contact" : {
+      "name" : "Team Swag",
+      "email" : "apiteam@swagger.io"
+    },
+    "license" : {
+      "name" : "Apache 2.0",
+      "url" : "http://www.apache.org/licenses/LICENSE-2.0.html"
+    }
+  },
+  "servers" : [ {
+    "url" : "https://petstore.swagger.io/v2"
+  }, {
+    "url" : "http://petstore.swagger.io/v2"
+  } ],
+  "paths" : {
+    "/pet" : {
+      "put" : {
+        "tags" : [ "pet" ],
+        "summary" : "Update an existing pet",
+        "operationId" : "updatePet",
+        "requestBody" : {
+          "description" : "Pet object that needs to be added to the store",
+          "content" : {
+            "application/json" : {
+              "schema" : {
+                "$ref" : "#/components/schemas/Pet"
+              }
+            },
+            "application/xml" : {
+              "schema" : {
+                "$ref" : "#/components/schemas/Pet"
+              }
+            }
+          },
+          "required" : true
+        },
+        "responses" : {
+          "400" : {
+            "description" : "Invalid ID supplied",
+            "content" : { }
+          },
+          "404" : {
+            "description" : "Pet not found",
+            "content" : { }
+          },
+          "405" : {
+            "description" : "Validation exception",
+            "content" : { }
+          }
+        },
+        "deprecated" : false,
+        "security" : [ {
+          "petstore_auth" : [ "write:pets", "read:pets" ]
+        } ],
+        "x-codegen-request-body-name" : "body"
+      },
+      "post" : {
+        "tags" : [ "pet" ],
+        "summary" : "Add a new pet to the store",
+        "operationId" : "addPet",
+        "requestBody" : {
+          "description" : "Pet object that needs to be added to the store",
+          "content" : {
+            "application/json" : {
+              "schema" : {
+                "$ref" : "#/components/schemas/Pet"
+              }
+            },
+            "application/xml" : {
+              "schema" : {
+                "$ref" : "#/components/schemas/Pet"
+              }
+            }
+          },
+          "required" : false
+        },
+        "responses" : {
+          "405" : {
+            "description" : "Invalid Input",
+            "content" : { }
+          }
+        },
+        "deprecated" : false,
+        "security" : [ {
+          "petstore_auth" : [ "write:pets", "read:pets" ]
+        } ],
+        "x-codegen-request-body-name" : "body"
+      }
+    }
+  },
+  "security" : { },
+  "tags" : [ {
+    "name" : "pet",
+    "description" : "Everything about your Pets",
+    "externalDocs" : {
+      "url" : "http://swagger.io",
+      "description" : "Find out more"
+    }
+  }, {
+    "name" : "store",
+    "description" : "Access to Petstore orders"
+  }, {
+    "name" : "user",
+    "description" : "Operations about user",
+    "externalDocs" : {
+      "url" : "http://swagger.io",
+      "description" : "Find out more about our store"
+    }
+  } ],
+  "externalDocs" : {
+    "url" : "http://swagger.io",
+    "description" : "Find out more about Swagger"
+  }
+}