diff --git a/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/RuntimeAPICommonUtil.java b/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/RuntimeAPICommonUtil.java
index c383a740b3..03f0433593 100644
--- a/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/RuntimeAPICommonUtil.java
+++ b/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/RuntimeAPICommonUtil.java
@@ -63,9 +63,8 @@ public static APIDefinitionValidationResponse validateOpenAPIDefinition(String t
                         new String(inputByteArray, StandardCharsets.UTF_8),
                         returnContent);
             } else {
-                throw new APIManagementException("Unsupported extension type of file: " +
-                        fileName,
-                        ExceptionCodes.UNSUPPORTED_GRAPHQL_FILE_EXTENSION);
+                OASParserUtil.addErrorToValidationResponse(validationResponse,
+                        "Invalid definition file type provided.");
             }
         }
         return validationResponse;
diff --git a/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/definitions/OASParserUtil.java b/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/definitions/OASParserUtil.java
index 3a582a6dc8..66eae511c8 100644
--- a/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/definitions/OASParserUtil.java
+++ b/runtime/config-deployer-service/java/src/main/java/org/wso2/apk/config/definitions/OASParserUtil.java
@@ -636,27 +636,33 @@ public static APIDefinitionValidationResponse validateGraphQLSchema(String apiDe
             boolean returnGraphQLSchemaContent) {
         APIDefinitionValidationResponse validationResponse = new APIDefinitionValidationResponse();
         ArrayList<ErrorHandler> errors = new ArrayList<>();
-        if (apiDefinition == "") {
+
+        if (apiDefinition.isBlank()) {
             validationResponse.setValid(false);
-            errors.add(new ErrorItem("Invalid API Definition", "API Definition is empty",
-                    400, 400));
+            errors.add(ExceptionCodes.GRAPHQL_SCHEMA_CANNOT_BE_NULL);
             validationResponse.setErrorItems(errors);
-            return validationResponse;
         }
 
         SchemaParser schemaParser = new SchemaParser();
-        TypeDefinitionRegistry typeRegistry = schemaParser.parse(apiDefinition);
-        GraphQLSchema graphQLSchema = UnExecutableSchemaGenerator.makeUnExecutableSchema(typeRegistry);
-        SchemaValidator schemaValidation = new SchemaValidator();
-        Set<SchemaValidationError> validationErrors = schemaValidation.validateSchema(graphQLSchema);
-
-        if (validationErrors.toArray().length > 0) {
+        Set<SchemaValidationError> validationErrors = new HashSet<>();
+        try {
+            TypeDefinitionRegistry typeRegistry = schemaParser.parse(apiDefinition);
+            GraphQLSchema graphQLSchema = UnExecutableSchemaGenerator.makeUnExecutableSchema(typeRegistry);
+            SchemaValidator schemaValidation = new SchemaValidator();
+            validationErrors = schemaValidation.validateSchema(graphQLSchema);
+            if (validationErrors.toArray().length > 0) {
+                validationResponse.setValid(false);
+                errors.add(ExceptionCodes.API_NOT_GRAPHQL);
+                validationResponse.setErrorItems(errors);
+            } else {
+                validationResponse.setValid(true);
+                validationResponse.setContent(apiDefinition);
+            }
+        } catch (Exception e) {
+            OASParserUtil.addErrorToValidationResponse(validationResponse, e.getMessage());
             validationResponse.setValid(false);
             errors.add(new ErrorItem("API Definition Validation Error", "API Definition is invalid", 400, 400));
             validationResponse.setErrorItems(errors);
-        } else {
-            validationResponse.setValid(true);
-            validationResponse.setContent(apiDefinition);
         }
 
         return validationResponse;
diff --git a/test/cucumber-tests/src/test/resources/artifacts/apk-confs/graphql_conf.apk-conf b/test/cucumber-tests/src/test/resources/artifacts/apk-confs/graphql_conf.apk-conf
new file mode 100644
index 0000000000..b8bb40ea33
--- /dev/null
+++ b/test/cucumber-tests/src/test/resources/artifacts/apk-confs/graphql_conf.apk-conf
@@ -0,0 +1,56 @@
+---
+name: ""
+basePath: "/"
+version: ""
+type: "GRAPHQL"
+defaultVersion: false
+subscriptionValidation: false
+operations:
+- target: "hero"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "reviews"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "search"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "character"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "droid"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "human"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "allHumans"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "allDroids"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "allCharacters"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "starship"
+  verb: "QUERY"
+  secured: true
+  scopes: []
+- target: "createReview"
+  verb: "MUTATION"
+  secured: true
+  scopes: []
+- target: "reviewAdded"
+  verb: "SUBSCRIPTION"
+  secured: true
+  scopes: []
diff --git a/test/cucumber-tests/src/test/resources/artifacts/definitions/graphql_sample_api.graphql b/test/cucumber-tests/src/test/resources/artifacts/definitions/graphql_sample_api.graphql
new file mode 100644
index 0000000000..d8273eab32
--- /dev/null
+++ b/test/cucumber-tests/src/test/resources/artifacts/definitions/graphql_sample_api.graphql
@@ -0,0 +1,199 @@
+schema {
+  query: Query
+  mutation: Mutation
+  subscription: Subscription
+}
+
+# The query type, represents all of the entry points into our object graph
+type Query {
+  hero(episode: Episode): Character
+  reviews(episode: Episode!): [Review]
+  search(text: String): [SearchResult]
+  character(id: ID!): Character
+  droid(id: ID!): Droid
+  human(id: ID!): Human
+  allHumans(first: Int): [Human]
+  allDroids(first: Int): [Droid]
+  allCharacters(first: Int): [Character]
+  starship(id: ID!): Starship
+}
+
+# The mutation type, represents all updates we can make to our data
+type Mutation {
+  createReview(episode: Episode, review: ReviewInput!): Review
+}
+
+# The subscription type, represents all subscriptions we can make to our data
+type Subscription {
+  reviewAdded(episode: Episode): Review
+}
+
+# The episodes in the Star Wars trilogy
+enum Episode {
+  # Star Wars Episode IV: A New Hope, released in 1977.
+  NEWHOPE
+
+  # Star Wars Episode V: The Empire Strikes Back, released in 1980.
+  EMPIRE
+
+  # Star Wars Episode VI: Return of the Jedi, released in 1983.
+  JEDI
+
+  # Star Wars Episode III: Revenge of the Sith, released in 2005
+  SITH
+}
+
+# A character from the Star Wars universe
+interface Character {
+  # The ID of the character
+  id: ID!
+
+  # The name of the character
+  name: String!
+
+  # The friends of the character, or an empty list if they have none
+  friends: [Character]
+
+  # The friends of the character exposed as a connection with edges
+  friendsConnection(first: Int, after: ID): FriendsConnection!
+
+  # The movies this character appears in
+  appearsIn: [Episode]!
+}
+
+# Units of height
+enum LengthUnit {
+  # The standard unit around the world
+  METER
+
+  # Primarily used in the United States
+  FOOT
+}
+
+# A humanoid creature from the Star Wars universe
+type Human implements Character {
+  # The ID of the human
+  id: ID!
+
+  # What this human calls themselves
+  name: String!
+
+  # The home planet of the human, or null if unknown
+  homePlanet: String
+
+  # Height in the preferred unit, default is meters
+  height(unit: LengthUnit = METER): Float
+
+  # Mass in kilograms, or null if unknown
+  mass: Float
+
+  # This human's friends, or an empty list if they have none
+  friends: [Character]
+
+  # The friends of the human exposed as a connection with edges
+  friendsConnection(first: Int, after: ID): FriendsConnection!
+
+  # The movies this human appears in
+  appearsIn: [Episode]!
+
+  # A list of starships this person has piloted, or an empty list if none
+  starships: [Starship]
+}
+
+# An autonomous mechanical character in the Star Wars universe
+type Droid implements Character {
+  # The ID of the droid
+  id: ID!
+
+  # What others call this droid
+  name: String!
+
+  # This droid's friends, or an empty list if they have none
+  friends: [Character]
+
+  # The friends of the droid exposed as a connection with edges
+  friendsConnection(first: Int, after: ID): FriendsConnection!
+
+  # The movies this droid appears in
+  appearsIn: [Episode]!
+
+  # This droid's primary function
+  primaryFunction: String
+}
+
+# A connection object for a character's friends
+type FriendsConnection {
+  # The total number of friends
+  totalCount: Int
+
+  # The edges for each of the character's friends.
+  edges: [FriendsEdge]
+
+  # A list of the friends, as a convenience when edges are not needed.
+  friends: [Character]
+
+  # Information for paginating this connection
+  pageInfo: PageInfo!
+}
+
+# An edge object for a character's friends
+type FriendsEdge {
+  # A cursor used for pagination
+  cursor: ID!
+
+  # The character represented by this friendship edge
+  node: Character
+}
+
+# Information for paginating this connection
+type PageInfo {
+  startCursor: ID
+  endCursor: ID
+  hasNextPage: Boolean!
+}
+
+# Represents a review for a movie
+type Review {
+  # The movie
+  episode: Episode
+
+  # The number of stars this review gave, 1-5
+  stars: Int!
+
+  # Comment about the movie
+  commentary: String
+}
+
+# The input object sent when someone is creating a new review
+input ReviewInput {
+  # 0-5 stars
+  stars: Int!
+
+  # Comment about the movie, optional
+  commentary: String
+
+  # Favorite color, optional
+  favorite_color: ColorInput
+}
+
+# The input object sent when passing in a color
+input ColorInput {
+  red: Int!
+  green: Int!
+  blue: Int!
+}
+
+type Starship {
+  # The ID of the starship
+  id: ID!
+
+  # The name of the starship
+  name: String!
+
+  # Length of the starship, along the longest axis
+  length(unit: LengthUnit = METER): Float
+
+  coordinates: [[Float!]!]
+}
+
+union SearchResult = Human | Droid | Starship
diff --git a/test/cucumber-tests/src/test/resources/artifacts/definitions/invalid_graphql_api.graphql b/test/cucumber-tests/src/test/resources/artifacts/definitions/invalid_graphql_api.graphql
new file mode 100644
index 0000000000..b6af211a85
--- /dev/null
+++ b/test/cucumber-tests/src/test/resources/artifacts/definitions/invalid_graphql_api.graphql
@@ -0,0 +1,185 @@
+schema {
+  query: Query
+  mutation: Mutation
+  subscription: Subscription
+}
+
+# The mutation type, represents all updates we can make to our data
+type Mutation {
+  createReview(episode: Episode, review: ReviewInput!): Review
+}
+
+# The subscription type, represents all subscriptions we can make to our data
+type Subscription {
+  reviewAdded(episode: Episode): Review
+}
+
+# The episodes in the Star Wars trilogy
+enum Episode {
+  # Star Wars Episode IV: A New Hope, released in 1977.
+  NEWHOPE
+
+  # Star Wars Episode V: The Empire Strikes Back, released in 1980.
+  EMPIRE
+
+  # Star Wars Episode VI: Return of the Jedi, released in 1983.
+  JEDI
+
+  # Star Wars Episode III: Revenge of the Sith, released in 2005
+  SITH
+}
+
+# A character from the Star Wars universe
+interface Character {
+  # The ID of the character
+  id: ID!
+
+  # The name of the character
+  name: String!
+
+  # The friends of the character, or an empty list if they have none
+  friends: [Character]
+
+  # The friends of the character exposed as a connection with edges
+  friendsConnection(first: Int, after: ID): FriendsConnection!
+
+  # The movies this character appears in
+  appearsIn: [Episode]!
+}
+
+# Units of height
+enum LengthUnit {
+  # The standard unit around the world
+  METER
+
+  # Primarily used in the United States
+  FOOT
+}
+
+# A humanoid creature from the Star Wars universe
+type Human implements Character {
+  # The ID of the human
+  id: ID!
+
+  # What this human calls themselves
+  name: String!
+
+  # The home planet of the human, or null if unknown
+  homePlanet: String
+
+  # Height in the preferred unit, default is meters
+  height(unit: LengthUnit = METER): Float
+
+  # Mass in kilograms, or null if unknown
+  mass: Float
+
+  # This human's friends, or an empty list if they have none
+  friends: [Character]
+
+  # The friends of the human exposed as a connection with edges
+  friendsConnection(first: Int, after: ID): FriendsConnection!
+
+  # The movies this human appears in
+  appearsIn: [Episode]!
+
+  # A list of starships this person has piloted, or an empty list if none
+  starships: [Starship]
+}
+
+# An autonomous mechanical character in the Star Wars universe
+type Droid implements Character {
+  # The ID of the droid
+  id: ID!
+
+  # What others call this droid
+  name: String!
+
+  # This droid's friends, or an empty list if they have none
+  friends: [Character]
+
+  # The friends of the droid exposed as a connection with edges
+  friendsConnection(first: Int, after: ID): FriendsConnection!
+
+  # The movies this droid appears in
+  appearsIn: [Episode]!
+
+  # This droid's primary function
+  primaryFunction: String
+}
+
+# A connection object for a character's friends
+type FriendsConnection {
+  # The total number of friends
+  totalCount: Int
+
+  # The edges for each of the character's friends.
+  edges: [FriendsEdge]
+
+  # A list of the friends, as a convenience when edges are not needed.
+  friends: [Character]
+
+  # Information for paginating this connection
+  pageInfo: PageInfo!
+}
+
+# An edge object for a character's friends
+type FriendsEdge {
+  # A cursor used for pagination
+  cursor: ID!
+
+  # The character represented by this friendship edge
+  node: Character
+}
+
+# Information for paginating this connection
+type PageInfo {
+  startCursor: ID
+  endCursor: ID
+  hasNextPage: Boolean!
+}
+
+# Represents a review for a movie
+type Review {
+  # The movie
+  episode: Episode
+
+  # The number of stars this review gave, 1-5
+  stars: Int!
+
+  # Comment about the movie
+  commentary: String
+}
+
+# The input object sent when someone is creating a new review
+input ReviewInput {
+  # 0-5 stars
+  stars: Int!
+
+  # Comment about the movie, optional
+  commentary: String
+
+  # Favorite color, optional
+  favorite_color: ColorInput
+}
+
+# The input object sent when passing in a color
+input ColorInput {
+  red: Int!
+  green: Int!
+  blue: Int!
+}
+
+type Starship {
+  # The ID of the starship
+  id: ID!
+
+  # The name of the starship
+  name: String!
+
+  # Length of the starship, along the longest axis
+  length(unit: LengthUnit = METER): Float
+
+  coordinates: [[Float!]!]
+}
+
+union SearchResult = Human | Droid | Starship
diff --git a/test/cucumber-tests/src/test/resources/tests/api/GraphQL.feature b/test/cucumber-tests/src/test/resources/tests/api/GraphQL.feature
new file mode 100644
index 0000000000..e1930538d0
--- /dev/null
+++ b/test/cucumber-tests/src/test/resources/tests/api/GraphQL.feature
@@ -0,0 +1,13 @@
+Feature: Generating APK conf for GraphQL API
+    Scenario: Generating APK conf using a valid GraphQL API definition
+        Given The system is ready
+        When I use the definition file "artifacts/definitions/graphql_sample_api.graphql" in resources
+        And generate the APK conf file for a "GRAPHQL" API
+        Then the response status code should be 200
+        And the response body should be "artifacts/apk-confs/graphql_conf.apk-conf" in resources
+
+    Scenario: Generating APK conf using an invalid GraphQL API definition
+        Given The system is ready
+        When I use the definition file "artifacts/definitions/invalid_graphql_api.graphql" in resources
+        And generate the APK conf file for a "GRAPHQL" API
+        Then the response status code should be 400