Code Using GraphQL

To run a ballerina-graphql client:

• Download and install Ballerina Language
• Then run bal run graphql_client.bal to run the service, with this code in the graphql_client.bal file:

import ballerina/graphql;
import ballerina/io;
 
type Response record {
    record { string hello; } data;
};
 
public function main() returns error? {
    graphql:Client helloClient = check new ("localhost:9090/graphql");
    string document = "{ hello }";
    Response response = check helloClient->execute(document);
    io:println(response.data.hello);
}

• Dependently-typed response retrieval with Ballerina type inferring
• Custom client generation support

To run a ballerina-graphql hello world server:

• Download and install Ballerina Language
• Then run bal run graphql_service.bal to run the service, with this code in the graphql_service.bal file:

import ballerina/graphql;
 
service /graphql on new graphql:Listener(9090) {
    resource function get hello() returns string {
        return "Hello, world!";
    }
}

• Built with Ballerina service and listener model, which are first-class citizens in Ballerina
• Supports subscriptions over websocket (No additional libraries needed)
• Supports file upload
• Built-in GraphiQL client