Test Your GraphQL Project

Before making changes to your GraphQL project, run the application locally to test the endpoints.

Before You Begin

Run Your Application

To deploy your Mule Application locally, run a debug session in Anypoint Code Builder:

In Anypoint Code Builder, open the Books Implementation project.
Click the (Run and Debug) icon in the activity bar, then click the Start Debugging (F5) icon.
Open the Terminal window in the console:
- Select View > Terminal.
- Alternatively, press Ctrl and then press the backtick key (`).
In the terminal, open a new command prompt by clicking the plus (+) icon, for example:

Alternatively, select a command shell, such as bash, by clicking the v menu (inverted caret), located beside the plus (+) icon, and selecting the shell to use.

Run the following curl command from the shell’s prompt to trigger the bookById flow:

curl --request POST \
--location 'http://localhost:8081/graphql' \
--header 'Content-Type: application/json' \
--data '{
  "query": "query bookById($id: ID) {bookById(id: $id){ id name pageCount author{ id firstName lastName}}}",
  "variables": {
    "id": 1
  }
}'

If you receive the error curl: (7) Failed to connect to localhost port 8081 after 0 ms: Couldn’t connect to server, stop and rerun the application in debug mode. For guidance with stopping the application, see Debugging Mule Applications.

Tools such as Postman provide a way to build GraphQL queries. For example, in Postman, you can place your query in the Body tab and copy the example curl request. The resulting command includes newline (\\n) and tab (\\t) characters that you can delete from the curl command’s --data value. For more information, see Make an HTTP call with GraphQL in the Postman documentation.

Anypoint Code Builder returns the following output in the terminal (manually reformatted to enhance readability):

{ "data": {
            "bookById": {
                          "id":"#myID",
                          "name":"This is some example data",
                          "pageCount":100,
                          "author": {
                                      "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                      "firstName":"This is some example data",
                                      "lastName":"Hello World!"
                                    }
                        }
          }
}

The mock data in the output comes from strings in the Set Payload component that is part of the Query.bookById flow (<flow name="Query.bookById"/>):

<set-payload value="{&#xa;  &quot;id&quot;: &quot;some-id&quot;,&#xa;
  &quot;name&quot;: &quot;This is some example data&quot;,&#xa;
  &quot;pageCount&quot;: -2,&#xa;  &quot;author&quot;: {&#xa;    &quot;id&quot;:
  &quot;urn:uuid:123e4567-e89b-12d3-a456-426655440000&quot;,&#xa;
  &quot;firstName&quot;: &quot;This is some example data&quot;,&#xa;
  &quot;lastName&quot;: &quot;This is some example data&quot;&#xa;  }&#xa;}"
  mimeType="application/json"/>

Optionally, try queries for other endpoints:

Query the books endpoint with the following curl command:

curl --location 'http://localhost:8081/graphql' \
--header 'Content-Type: application/json' \
--data '{"query":"query books { books{  id  name  pageCount  author{ id firstName lastName  } }}","variables":{}}'

This command returns the following result (manually reformatted to enhance readability):

{ "data": {
            "books": [{
                         "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                          "name":"This is some example data",
                          "pageCount":1,
                          "author": {
                                       "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                       "firstName":"This is some example data",
                                       "lastName":"Hello World!"
                                    }
                     }]
           }
}

For your reference, the books endpoint has the following structure:

query books {
	books{
		id
		name
		pageCount
		author{
			id
			firstName
			lastName
		}
	}
}

Query bestSellers:

curl --location 'http://localhost:8081/graphql' \
--header 'Content-Type: application/json' \
--data '{"query":"query bestsellers { bestsellers{  books{   id   name   pageCount   author{    id    firstName    lastName   }  }  authors{   id   firstName   lastName  } } }","variables":{}}'

This command returns the following result (manually reformatted to enhance readability):

{ "data" : {
             "bestsellers": {
                              "books": [{
                                          "id":"#myID",
                                          "name":"This is some example data",
                                          "pageCount":1,
                                          "author": {
                                                      "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                                      "firstName":"This is some example data",
                                                      "lastName":"Hello World!"
                                                    }
                                        },
                                        {
                                          "id":"some-id",
                                          "name":"Goodbye",
                                          "pageCount":100,
                                          "author": {
                                                      "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                                      "firstName":"This is some example data",
                                                      "lastName":"Hello World!"
                                                    }
                                        },
                                        {
                                          "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                          "name":"Hello World!",
                                          "pageCount":-10,
                                          "author": {
                                                      "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                                      "firstName":"This is some example data",
                                                      "lastName":"Hello World!"
                                                    }
                                        }],
                              "authors": [{
                                            "id":"urn:uuid:123e4567-e89b-12d3-a456-426655440000",
                                            "firstName":"Hello World!",
                                            "lastName":"Hello World!"
                                          },
                                          {
                                            "id":"#myID",
                                            "firstName":"Goodbye",
                                            "lastName":"Goodbye"
                                          }]
                            }
           }
}

For your reference, the bestsellers endpoint has the following structure:

query bestsellers {
	bestsellers{
		books{
			id
			name
			pageCount
			author{
				id
				firstName
				lastName
			}
		}
		authors{
			id
			firstName
			lastName
		}
	}
}

Proceed to Configure Responses for Your GraphQL Implementation to populate each flow with a custom response for each query.