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---
layout: ballerina-home-page
title: Ballerina Home
description: Ballerina is an open-source programming language for the cloud that makes it easier to use, combine and create network services.
keywords: ballerina, ballerinalang, cloud native, microservices, integration, programming language
---
<link href="https://fonts.googleapis.com/css?family=Special+Elite&display=swap" rel="stylesheet"/>
<link rel="stylesheet" href="/css/home-page-2020.css"/>
<link rel="stylesheet" href="/css/prism.css">
<style>
.nav-tabs > li.active > a, .nav-tabs > li.active > a:focus, .nav-tabs > li.active > a:hover {
color: #464646;
cursor: default;
border: transparent;
border-bottom: #20b6b0 3px solid !important;
background-color: transparent !important;
}
.nav-tabs > li > a:hover {
border-color:transparent !important;
}
.disabled {
pointer-events: none;
cursor: default;
background-color: #57595d !important;
}
.nav-tabs > li > a{
border-bottom: transparent 3px solid !important;
}
.cBallerina-io-Gray-row {
padding-bottom:0px;
}
tr:last-child >td{border-bottom: 0 !important;}
a {
/* font-size: 20px; */
color: #20b6b0;
text-decoration: none;
}
.focusPane{
transition: transform .2s; /* Animation */
border: 1px #c7c7c7 solid;
}
.focusPane:hover{
transform: scale(1.019);
background-color: #f5f5f5;
border: 1px #20b6b0 solid !important;
z-index: 7;
}
.eventBanner{
background-color: #f5f5f5;
padding: 30px;
font-size: 18px;
margin-top: 15px;
font-weight: 400;
text-align: center;
}
.cVideoPlayButton {
position: absolute;
z-index: 8;
top: 59.5%;
left: 50%;
transform: translateX(-50%) translateY(-50%);
box-sizing: content-box;
display: block;
width: 32px;
height: 44px;
background: #10101077;
border-radius: 50%;
padding: 22px 15px 10px 28px;
}
.cVideoPlayButton span {
width: 0;
height: 0;
display: block;
position: relative;
z-index: 6;
border-left: 26px solid #fff;
border-top: 16px solid transparent;
border-bottom: 16px solid transparent;
}
.cVideoPlayButton img {
position: relative;
z-index: 3;
max-width: 100%;
width: auto;
height: auto;
}
#cMainVideoFrame:hover + .cVideoPlayButton {
background: #20b6b0 !important;
}
.line-numbers .line-numbers-rows {
position: absolute;
pointer-events: none;
top: 0;
font-size: 100%;
left: 0em;
width: 0em; /* works for line-numbers below 1000 lines */
letter-spacing: -1px;
border-right: 1px solid #999;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
.code[class*="language-"], .pre[class*="language-"] {
font-size: 12px !important;
}
.line-numbers-rows > span {
pointer-events: none;
display: none;
counter-increment: linenumber;
}
/* .cColHeight1{height:665px} */
.line-numbers-rows > span:before {
content: counter(linenumber);
color: #999;
display: none;
padding-right: 0em;
text-align: right;
}
pre.line-numbers {
position: relative;
padding-left: 15px !important;
counter-reset: linenumber;
}
pre[class*="language-"] {
padding: 0em;
margin: 0;
overflow: auto;
}
pre{
border:none !important;
}
.playground-button:hover{
color: #464646 !important;
background-image: url(/img/play-button-hover.svg) !important;
}
td.cEventDateContainer1 span.cEventDate1{
width: 100%;
font-size: 18px;
font-weight: 400;
display: inline-block;
color: #57595d;
margin-bottom: 5px;
border: none;
text-align: right;
}
tr:last-child >td{border-bottom: 0 !important;}
.cEventName{
margin-top: -2px;
font-size: 20px;
}
td.cEventDateContainer{
width: 20%;
}
.cEventDateNum{
font-size: 20px !important;
font-weight: 450 !important;
}
.cEventDate1{text-align: right;}
</style>
<link rel="stylesheet" href="/css/events-page.css">
<style>
/* table.cEventTable.docutils td.cEventDateContainer, table.cEventTable.docutils td.cEventDetail, table.cEventTable.docutils td.cEventURL {
border-bottom: 0px !important;
} */
tr:last-child >td{border-bottom: 0 !important;}
</style>
<!-- <link rel="stylesheet" href="/css/home-page-old.css"/> -->
<div class="row cBallerinaIntroSection">
<div class="container">
<div class="col-sm-12 col-md-12 cTopLayer">
<div class="col-sm-12 col-md-8">
<img class="cHomePageLogo" src="/img/ballerina-logo-whiite.svg ">
<!--<h1>A Programming Language for
Network Distributed Applications
</h1>-->
</div>
<div class="col-sm-12 col-md-4">
</div>
</div>
<div class="col-sm-12 col-md-12 cBottomLayer">
<div class="col-sm-12 col-md-7">
<p>Ballerina is an open-source programming language for the cloud that makes it easier to use, combine, and create network services.
</p>
</div>
<!-- <div class="col-sm-12 col-md-1"> </div> -->
<div class="col-sm-12 col-md-5 cMainCTAContainer">
<a class="cBallerina-io-Home-main-download-button" target="_blank" href="/learn/getting-started-with-ballerina/">
Get started
<p>Install Ballerina, set it all up <br>and take it for a spin.</p>
</a>
<a class="cBallerina-io-Home-main-download-button cPlayButton" target="_blank" href="/learn/by-example/">
Examples
<p>Explore and try Ballerina examples.<br> </p>
</a>
<!-- <a class="cBallerina-io-Home-main-download-button" href="/downloads">
Download Ballerina
<p>Distributions are available for <br>Linux, OS X, and Windows</p>
</a> -->
<!-- <ul>
<li style="margin: 0;"><a class="cIconLink" href="/learn/by-example/" target="_blank">Ballerina By Example</a></li>
<li ><a class="cIconLink" href="/learn/installing-ballerina/setting-up-ballerina/">Get Started</a></li>
</ul> -->
</div>
</div>
<!--<div class="col-sm-12 col-md-12">
<p class="cQuotes">A programming language that doesn't change the way you think about programming is not
worth knowing <span>- <a href="">Alan Perlis</a></span>
</p>
</div>-->
</div>
</div>
</div>
</div>
<!--START OF TRY BALLERINA TAB DESIGN 1-->
<div class="row cWidget cWhyBallerinaLinks" style="padding-top:3rem; padding-bottom: 8.5rem; background-color: #f5f5f5;">
<div class="container">
<div class="col-sm-12 col-md-12">
<h2 id="ballerina-in-action">Ballerina in action</h2>
<div class="cHscroll">
<ul class="nav nav-tabs cSamplesList">
<li class="active" ><a data-toggle="tab" href="#consuming-services" >Consuming services</a></li>
<li><a data-toggle="tab" href="#working-with-data" >Working with data</a></li>
<li><a data-toggle="tab" href="#restful-api" >RESTful API</a></li>
<li><a data-toggle="tab" href="#grpc-api" >gRPC API</a></li>
<li><a data-toggle="tab" href="#graphql-api" >GraphQL API</a></li>
<li><a data-toggle="tab" href="#kafka-consumer" >Kafka consumer/producer</a></li>
<li><a data-toggle="tab" href="#working-with-databases" >Working with databases</a></li>
</ul>
</div>
<div class="tab-content">
<div id="restful-api" class="tab-pane fade " >
<div class="row" style="background-color: #f5f5f5;">
<div class="col-lg-12 col-md-12 col-sm-12 focusPane " style="padding:20px;">
<div class="FullCode" style="background-color: #f5f5f5;">
<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/http;
configurable int port = 8080;
type Album readonly & record {|
string id;
string title;
string artist;
decimal price;
|};
table<Album> key(id) albums = table [
{id: "1", title: "Blue Train", artist: "John Coltrane", price: 56.99},
{id: "2", title: "Jeru", artist: "Gerry Mulligan", price: 17.99},
{id: "3", title: "Sarah Vaughan and Clifford Brown", artist: "Sarah Vaughan", price: 39.99}
];
service / on new http:Listener(port) {
resource function get albums() returns Album[] {
return albums.toArray();
}
resource function get albums/[string id]() returns Album|http:NotFound {
Album? album = albums[id];
if album is () {
return <http:NotFound>{};
} else {
return album;
}
}
resource function post albums(@http:Payload Album album) returns Album {
albums.add(album);
return album;
}
}
</code>
</pre>
</div>
</div>
</div>
<!-- <div class="col-lg-5 col-sm-12 focusPane" style="padding:20px;border: 1px #c7c7c7 solid;">
<img src="img/consuming-services-diagram.svg" style="max-width: 520px;" />
</div> -->
</div>
</div>
<div id="consuming-services" class="tab-pane fade in active" >
<div class="row cdisplayFlex" style="background-color: #f5f5f5;">
<div class="col-lg-7 col-md-12 col-sm-12 focusPane codeBlock noBottomBorder" id="column1" style="padding:20px;border: 1px #c7c7c7 solid; ">
<div class="FullCode" style="background-color: #f5f5f5;">
<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/http;
import ballerinax/googleapis.sheets;
configurable string githubPAT = ?;
configurable string repository = "ballerina-platform/ballerina-lang";
configurable string sheetsAccessToken = ?;
configurable string spreadSheetId = ?;
configurable string sheetName = "Sheet1";
type PR record {
string url;
string title;
string state;
string created_at;
string updated_at;
};
public function main() returns error? {
http:Client github = check new ("https://api.github.com/repos");
map<string> headers = {
"Accept": "application/vnd.github.v3+json",
"Authorization": "token " + githubPAT
};
PR[] prs = check github->get(string `/${repository}/pulls`, headers);
sheets:Client gsheets = check new ({auth: {token: sheetsAccessToken}});
check gsheets->appendRowToSheet(spreadSheetId, sheetName,
["Issue", "Title", "State", "Created At", "Updated At"]);
foreach var {url, title, state, created_at, updated_at} in prs {
check gsheets->appendRowToSheet(spreadSheetId, sheetName,
[url, title, state, created_at, updated_at]);
}
}
</code>
</pre>
</div>
</div>
</div>
<div class="col-lg-5 col-md-12 col-sm-12 focusPane" id="column2" style="padding:20px;border: 1px #c7c7c7 solid;">
<img src="img/consuming-services-diagram.svg" style="max-width: 520px;" />
</div>
</div>
</div>
<div id="working-with-data" class="tab-pane fade" >
<div class="row cdisplayFlex" style="background-color: #f5f5f5;">
<div class="col-lg-7 col-md-12 col-sm-12 focusPane codeBlock noBottomBorder" style="padding:20px;border: 1px #c7c7c7 solid;">
<div class="FullCode" style="background-color: #f5f5f5;">
<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/http;
import ballerina/io;
type Country record {
string country;
int population;
string continent;
int cases;
int deaths;
};
// Prints the top 10 countries having the highest case-fatality ratio.
public function main() returns error? {
http:Client diseaseEp = check new ("https://disease.sh/v3");
Country[] countries = check diseaseEp->get("/covid-19/countries");
json summary =
from var {country, continent, population, cases, deaths} in countries
where population >= 100000 && deaths >= 100
let decimal caseFatalityRatio = <decimal>deaths / <decimal>cases * 100
order by caseFatalityRatio descending
limit 10
select {country, continent, population, caseFatalityRatio};
io:println(summary);
}
</code>
</pre>
</div>
</div>
</div>
<div class="col-lg-5 col-md-12 col-sm-12 focusPane cColHeight1 diagramBox" style="padding:20px;border: 1px #c7c7c7 solid;">
<img src="img/working-with-data-diagram.svg" style="max-width: 520px;" />
<a target="_blank" href="https://play.ballerina.io/?gist=30a51792b6b4d46c2cbdfdd424fb3b45&file=play.bal" style="z-index: 999;">
<button class="playground-button" id="simple11" style="background:url(/img/play=button.svg)no-repeat scroll right center; color:#20b6b0;padding: 12px 30px ;border: none;float: right;background-size:20px ;font-size: 17px;margin-right: 50px;margin-top: 50px;"> Try in Playground</button>
</a>
</div>
</div>
</div>
<div id="grpc-api" class="tab-pane fade" >
<div class="row cdisplayFlex" style="background-color: #f5f5f5;">
<div class="col-lg-7 col-md-12 col-sm-12 focusPane codeBlock noBottomBorder" style="padding:20px;border: 1px #c7c7c7 solid;">
<div class="FullCode" style="background-color: #f5f5f5;">
<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/grpc;
configurable int port = 9090;
Album[] albums = [
{id: "1", title: "Blue Train", artist: "John Coltrane", price: 56.99},
{id: "2", title: "Jeru", artist: "Gerry Mulligan", price: 17.99},
{id: "3", title: "Sarah Vaughan and Clifford Brown", artist: "Sarah Vaughan", price: 39.99}
];
@grpc:ServiceDescriptor {
descriptor: ROOT_DESCRIPTOR_RECORD_STORE,
descMap: getDescriptorMapRecordStore()
}
service "Albums" on new grpc:Listener(port) {
remote function getAlbum(string id) returns Album|error {
Album[] filteredAlbums = albums.filter(album => album.id == id);
if filteredAlbums.length() > 0 {
return filteredAlbums.pop();
}
return error grpc:NotFoundError(string `Cannot find the album for ID ${id}`);
}
remote function addAlbum(Album album) returns Album|error {
albums.push(album);
return album;
}
remote function listAlbums() returns stream<Album, error?>|error {
return albums.toStream();
}
}
</code>
</pre>
</div>
</div>
</div>
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<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
syntax = "proto3";
import "google/protobuf/wrappers.proto";
import "google/protobuf/empty.proto";
service Albums {
rpc getAlbum(google.protobuf.StringValue)
returns (Album);
rpc addAlbum(Album) returns (Album);
rpc listAlbums(google.protobuf.Empty)
returns (stream Album);
}
message Album {
string id = 1;
string title = 2;
string artist = 3;
float price = 4;
};
</code>
</pre>
</div>
</div>
</div>
</div>
</div>
<div id="graphql-api" class="tab-pane fade" >
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<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/graphql;
import ballerina/http;
import ballerinax/mysql;
import ballerinax/mysql.driver as _;
configurable string user = ?;
configurable string password = ?;
configurable string host = ?;
configurable int port = ?;
configurable string database = ?;
configurable string apiEndpoint = ?;
public type Album record {
string id;
string title;
string artist;
decimal price;
Currency currency = USD;
};
public enum Currency {
USD,
LKR,
EUR,
GBP
}
service / on new graphql:Listener(9000) {
private final mysql:Client db;
private final http:Client forex;
private final Currency baseCurrency = USD;
function init() returns error? {
self.db = check new (host, user, password, database, port);
self.forex = check new (apiEndpoint);
}
resource function get album(string id, Currency currency = USD) returns Album|error {
Album album = check self.db->queryRow(`SELECT * FROM Albums WHERE id=${id}`);
if currency != self.baseCurrency {
string query = string `from=${self.baseCurrency}&to=${currency}`;
record {decimal rate;} exchange = check self.forex->get(string `/curerncyConversion?${query}`);
album.price = album.price * exchange.rate;
album.currency = currency;
}
return album;
}
}
</code>
</pre>
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<div class="highlight">
<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/http;
import ballerina/sql;
import ballerinax/mysql;
import ballerinax/mysql.driver as _;
configurable string host = ?;
configurable int port = ?;
configurable string user = ?;
configurable string password = ?;
configurable string database = ?;
type Album record {|
string id;
string title;
string artist;
decimal price;
|};
service / on new http:Listener(8080) {
private final mysql:Client db;
function init() returns error? {
self.db = check new (host, user, password, database, port);
}
resource function get albums() returns Album[]|error? {
stream<Album, sql:Error?> albumStream = self.db->query(`SELECT * FROM Albums`);
Album[]? albums = check from Album album in albumStream select album;
check albumStream.close();
return albums;
}
resource function get albums/[string id]() returns Album|http:NotFound|error {
Album|sql:Error result = self.db->queryRow(`SELECT * FROM Albums WHERE id = ${id}`);
if result is sql:NoRowsError {
return <http:NotFound>{};
} else {
return result;
}
}
resource function post album(@http:Payload Album album) returns Album|error {
_ = check self.db->execute(`
INSERT INTO Albums (id, title, artist, price)
VALUES (${album.id}, ${album.title}, ${album.artist}, ${album.price});`);
return album;
}
}
</code>
</pre>
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<pre class="language-ballerina basic ballerina">
<code class="language-ballerina ballerina" style="font-size: 12px !important;">
import ballerina/lang.value;
import ballerinax/kafka;
configurable string groupId = "order-consumers";
configurable string orders = "orders";
configurable string paymentSuccessOrders = "payment-success-orders";
configurable decimal pollingInterval = 1;
configurable string kafkaEndpoint = kafka:DEFAULT_URL;
type Order readonly & record {|
int id;
string desc;
PaymentStatus paymentStatus;
|};
enum PaymentStatus {
SUCCESS,
FAIL
}
final kafka:ConsumerConfiguration consumerConfigs = {
groupId: groupId,
topics: [orders],
offsetReset: kafka:OFFSET_RESET_EARLIEST,
pollingInterval: pollingInterval
};
service on new kafka:Listener(kafkaEndpoint, consumerConfigs) {
private final kafka:Producer orderProducer;
function init() returns error? {
self.orderProducer = check new (kafkaEndpoint);
}
remote function onConsumerRecord(kafka:ConsumerRecord[] records) returns error? {
check from kafka:ConsumerRecord {value} in records
let string orderString = check string:fromBytes(value)
let Order 'order = check value:fromJsonStringWithType(orderString)
where 'order.paymentStatus == SUCCESS
do {
check self.orderProducer->send({
topic: paymentSuccessOrders,
value: 'order.toString().toBytes()
});
};
}
}
</code>
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