Getting Started with Amazon Cognito Identity JS

Amazon Cognito Identity JS is a JavaScript library that makes it easy to add user sign-up and sign-in functionality to your web and mobile applications. It provides a simple way to authenticate users and manage their identities.

To get started with Amazon Cognito Identity JS, you need to first create an Amazon Cognito User Pool. This is where you define the users and their identities. You can do this by going to the AWS Management Console and clicking on the "Create a user pool" button.

A user pool is a store of user identities that you can use to authenticate users. It's like a database of users, but with more features. You can customize the user pool to fit your needs, such as choosing the sign-up and sign-in options.

Once you have created your user pool, you can use the Amazon Cognito Identity JS library to authenticate users and manage their identities. This library provides a simple API that you can use to authenticate users and get their identities.

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To get started with Amazon Cognito Identity JS, you need to set it up and install the necessary files. There are two ways to do this, depending on your project setup and experience with modern JavaScript build tools.

You can either download the bundle file from npm and include it in your HTML, or install the dependencies with npm and use a bundler like webpack. Note that the build files are no longer available in the GitHub repo, so you'll need to use npm to download the whole package and extract the build files from it.

To use the SDK, you need to include all the necessary files in your HTML page before calling any Amazon Cognito Identity SDK APIs. This includes linking the native modules to your project.

Here are the two methods for setup and installation:

The first method is simpler, but may have worse performance due to the browser having to download multiple files. If you choose this method, download the amazon-cognito-identity-js package from npm and get amazon-cognito-identity.min.js file from the dist folder. Place it in your project. Optionally, to use other AWS services, include a build of the AWS SDK for JavaScript.

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To configure Amazon Cognito Identity JS, you'll need two configuration values from your AWS account. These values are the User Pool Id and User Pool App Client Id.

You can obtain these values by using the AWS Console for Cognito User Pools. The User Pool Id is a unique identifier for your user pool, and the User Pool App Client Id is a unique identifier for your app client.

Here are the specific configuration values you'll need:

If you're using Cognito Federated Identity or Cognito Sync, you'll also need the Id of a Cognito Identity Pool that will accept logins from your Cognito User Pool and App.

To configure Amazon Cognito, you'll need to obtain two essential values from your AWS account. The User Pool Id, for example, us-east-1_aB12cDe34, serves as a unique identifier for your user pool.

You can get or create these values using the AWS Console for Cognito User Pools. This will also provide you with a User Pool App Client Id, such as 7ghr5379orhbo88d52vphda6s9.

If you plan to use Cognito Federated Identity to provide access to your AWS resources or Cognito Sync, you'll also need the Id of a Cognito Identity Pool that will accept logins from the above Cognito User Pool and App, i.e. us-east-1:85156295-afa8-482c-8933-1371f8b3b145.

Here are the configuration values you'll need:

Adding email confirmation to your services can be a great way to ensure users have a verified email address on file. This can be achieved by using Amazon Cognito's built-in email verification feature.

To get started, you'll need to import the necessary modules, including CognitoUserPool, CognitoUser, and AuthenticationDetails. This is shown in the signin function, where it imports these modules from 'amazon-cognito-identity-js'.

The signin function takes in pool data, a body object containing the username and password, and a callback function. The function then creates a new CognitoUserPool instance using the provided pool data.

The authentication data is created with the username and password from the body object. This data is then used to create an AuthenticationDetails instance.

The userData object is created with the username and the newly created CognitoUserPool instance. This object is then used to create a new CognitoUser instance.

The CognitoUser instance is then used to authenticate the user using the provided authentication details. The onSuccess callback is triggered when the authentication is successful, and it returns a data object containing the refresh token, access token, access token expiration, ID token, and ID token expiration.

The signin function also handles various authentication scenarios, including MFA, TOTP, and new password requirements. These scenarios are triggered by the corresponding callbacks in the authenticateUser function.

Amazon Cognito Identity JS makes it easy to add user authentication to your application. You can use it with popular frameworks like React, Angular, and Ember.js.

For React, you can see a working example using babel-webpack in the babel-webpack example. This example shows how to set up Amazon Cognito Identity JS with React.

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Angular users can check out the cognito-angular2-quickstart for a working example. This example demonstrates how to use Amazon Cognito Identity JS with Angular.

Ember.js users have a couple of options: aws-serverless-ember and aws-mobilehub-ember. Both of these examples show how to integrate Amazon Cognito Identity JS with Ember.js.

If you're building a React Native app, you'll need to make an extra async call to load the persisted current user information. This is a known requirement in React Native, as noted in version 1.18.0 of Amazon Cognito Identity JS.

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Integration and UI is where the magic happens. You can use Amazon Cognito Identity JS to connect your UI to Cognito.

A simple HTML application is a great place to start. This application allows users to sign-up, log in, and confirm their email all in one place.

The HTML page is where you'll want to add the UI elements that interact with Cognito. You can see an example of what this might look like in the article.

The JS code is where the connection to Cognito is made. You can expose Cognito functions via a Webpack bundle and then call them from your UI. This is demonstrated in the article.

You'll want to do something with the response from Cognito, like give user feedback or save data in a database. But for now, console-logging the response is a good place to start.

The Amazon Cognito Identity SDK for JavaScript is a powerful tool for adding user sign-up and sign-in to your mobile and web apps. You can easily integrate it into your project by installing it as a dependency using npm.

To install the SDK, use the following command: npm i amazon-cognito-identity-js. This will add the necessary code to your project, allowing you to leverage Amazon Cognito's fully managed user directory.

Your User Pool in Amazon Cognito can scale to hundreds of millions of users, so you don't have to worry about building, securing, and scaling a solution to handle user management and authentication.

If you have any feedback or suggestions for the SDK, you can create an issue on the GitHub repository or post to the Amazon Cognito Identity forums.

The SDK has undergone several updates, including version 1.29.0 and version 1.13.0.

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