Connect to Back4app

now that you've created your application on back4app, you’re just a few steps away from using its backend features this guide will walk you through connecting your app to back4app's servers using the parse sdk or rest apis prerequisites to complete this tutorial, you will need create an application create a new app on back4app https //www back4app com/docs/get started/new parse app if you haven't already access application keys go to server settings > core settings > app id and keys to find your keys you will use these to authenticate with back4app 1 install the parse sdk based on the platform you’re working with, follow one of the installation methods below javascript (web or node js) react native flutter add parse sdk to pubspec yaml to check the latest version, you can check here android open your build gradle file (module app) and add the following dependencies to check the latest version, you can check here ios install cocoapods 2\ add parse sdk to your podfile you can also use the swift package manager (spm) or carthage to install parseswift click here to know more php create a composer json file in your project root with the following content then run 2\ or clone from github for more details, see this guide net add parse sdk from nuget packages open visual studio, go to solution explorer, right click your project, and select manage nuget packages search for parse and install it for more details, see this guide 2 initialize the parse sdk once the sdk is installed, initialize it in your app below are examples for each platform // import parse sdk const parse = require('parse/node'); // initialize with your back4app keys parse initialize("your app id", "your js key"); // replace with your app id and js key parse serverurl = 'https //parseapi back4app com'; rn import parse from 'parse/react native'; import asyncstorage from '@react native async storage/async storage'; // set asyncstorage parse setasyncstorage(asyncstorage); // initialize parse parse initialize("your app id", "your js key"); // replace with your app id and js key parse serverurl = 'https //parseapi back4app com'; flutter import 'package\ parse server sdk flutter/parse server sdk flutter dart'; void main() async { await parse() initialize( 'your app id', // replace with your app id 'https //parseapi back4app com', clientkey 'your client key', // replace with your client key ); } android parse initialize(new parse configuration builder(context) applicationid("your app id") // replace with your app id clientkey("your client key") // replace with your client key server("https //parseapi back4app com") build() ); ios import parseswift parseswift initialize(applicationid "your app id", clientkey "your client key", serverurl url(string "https //parseapi back4app com")!)require 'vendor/autoload php'; parseclient initialize('your app id', 'your rest key', 'your master key'); parseclient setserverurl('https //parseapi back4app com', '/'); net parseclient initialize(new parseclient configuration { applicationid = "your app id", // replace with your app id key = "your master key" serveruri = "https //parseapi back4app com/" }); 3 save and read your first data object to ensure your connection is set up correctly, save and retrieve a test object in your back4app app here’s an example // create and save a test object const person = new parse object("person"); person set("name", "jon snow"); person set("age", 30); person save() then(() => console log("successfully connected to back4app!")) catch((error) => console error("connection error ", error message)); rn // create and save a test object const testconnection = async () => { const person = new parse object("person"); person set("name", "jon snow"); person set("age", 30); try { await person save(); console log("successfully connected to back4app!"); } catch (error) { console error("connection error ", error message); } }; testconnection(); flutter import 'package\ parse server sdk flutter/parse server sdk flutter dart'; // test connection by saving an object void testconnection() async { var person = parseobject('person') set('name', 'jon snow') set('age', 30); var response = await person save(); if (response success) { print("successfully connected to back4app!"); } else { print("connection error ${response error? message}"); } } testconnection(); android import com parse parseobject; import com parse savecallback; import com parse parseexception; // test connection by saving an object parseobject person = new parseobject("person"); person put("name", "jon snow"); person put("age", 30); person saveinbackground(new savecallback() { @override public void done(parseexception e) { if (e == null) { log i("parseconnection", "successfully connected to back4app!"); } else { log e("parseconnection", "connection error " + e getmessage()); } } }); ios import parseswift // test connection by saving an object struct person parseobject { var objectid string? var name string? var age int? // required parseobject properties var createdat date? var updatedat date? var acl parseacl? init() { // default empty initializer } } func testconnection() { var person = person() person name = "jon snow" person age = 30 person save { result in switch result { case success print("successfully connected to back4app!") case failure(let error) print("connection error \\(error localizeddescription)") } } } testconnection()require 'vendor/autoload php'; // create and save a test object $person = new parseobject("person"); $person >set("name", "jon snow"); $person >set("age", 30); try { $person >save(); echo "successfully connected to back4app!"; } catch (parseexception $error) { echo "connection error " $error >getmessage(); } net using parse; // create and save a test object var person = new parseobject("person"); person\["name"] = "jon snow"; person\["age"] = 30; await person saveasync() continuewith(t => { if (t iscompletedsuccessfully) { console writeline("successfully connected to back4app!"); } else { console writeline("connection error " + t exception? message); } }); rest api //saving your first data object on back4app curl x post \\ h "x parse application id application id" \\ h "x parse rest api key rest api key" \\ h "content type application/json" \\ d '{"name" "john snow","age" 27}' \\ https //parseapi back4app com/classes/person //reading your first data object from back4app curl x get \\ h "x parse application id application id" \\ h "x parse rest api key rest api key" \\ https //parseapi back4app com/classes/person/object id here after running these code snippets, check your back4app dashboard to verify that the object was saved successfully this confirms that your connection to back4app is working what to do next? after a quick start, we recommend keeping exploring the back4app main features by checking out the guides below react native flutter android ios javascript graphql ionic xamarin