Set up fullstack project

To get started, initialize a new React Native project.

1npx create-expo-app amplified_todo
2
3cd amplified_todo

1npx expo run:android

1npx expo run:ios

Initialize a new backend

Now that you have a running app, it's time to set up Amplify so that you can create the necessary backend services needed to support the app.

Open a new terminal. From the root of the project, run:

1amplify init

When you initialize Amplify you'll be prompted for some information about the app:

1? Enter a name for the project (amplified_todo)
2The following configuration will be applied:
3
4Project information
5| Name: amplified_todo
6| Environment: dev
7| Default editor: Visual Studio Code
8| App type: javascript
9| Javascript framework: react-native
10| Source Directory Path: /
11| Distribution Directory Path: /
12| Build Command: npm run-script build
13| Start Command: npm run-script start
14
15? Initialize the project with the above configuration? Yes
16Using default provider  awscloudformation
17? Select the authentication method you want to use: AWS profile
18? Please choose the profile you want to use default

When you initialize a new Amplify project, a few things happen:

• It creates a top level directory called amplify that stores your backend definition. During the tutorial you'll add cloud capabilities, such as GraphQL API and web hosting. As you add these features, the amplify folder will grow with infrastructure-as-code templates that define your backend stack. Infrastructure-as-code is a best practice way to create a replicable backend stack.
• It creates a file called amplifyconfiguration.json in your designated Source Directory Path that holds all the configuration for the services you create with Amplify. This is how the Amplify JavaScript client library is able to get the necessary information to connect to your backend services.
• It modifies the .gitignore file, adding some generated files to the ignore list

Install Amplify Libraries

Install the necessary dependencies by running the following command:

1npm install aws-amplify @aws-amplify/react-native @react-native-community/netinfo @react-native-async-storage/async-storage react-native-get-random-values

1// App.js
2
3import { Amplify } from 'aws-amplify';
4import amplifyconfig from './src/amplifyconfiguration.json';
5Amplify.configure(amplifyconfig);

And that's all it takes to configure Amplify. As you add or remove categories and make updates to your backend configuration using the Amplify CLI, the configuration in amplifyconfiguration.json will update automatically.

Now that your app is set up and Amplify is initialized, you can add an API in the next step.

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Set up Amplify CLI

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Connect API and database to the app