Hello world service

import ballerina/http;

service / on new http:Listener(9090) {

    // This function responds with `string` value `Hello, World!` to HTTP GET requests.
    resource function get greeting() returns string {
        return "Hello, World!";
    }

}

Hello world service

Let’s write a simple HTTP service in Ballerina. This example demonstrates the network primitives in the language that make it simpler to develop services.

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Hello world main

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Programs and modules

import ballerina/http;

service / on new http:Listener(9090) {

    resource function get greeting() returns string {
        return "Hello, World!";
    }

This function responds with string value Hello, World! to HTTP GET requests.

bal run hello_world_service.bal

# Invoke the service using the "cURL" command below.
curl http://localhost:9090/greeting
Hello, World!