May 13, 2022

Top 20 AWS AppSync Interview Questions and Answers


        AWS AppSync is an Amazon Web Services (AWS) public cloud application development service that synchronizes data for mobile and web apps in real time. End users can also update data within an application even if their computer or mobile device is offline, and the service executes synchronisation once connectivity is restored.

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AWS AppSync is ideal for creating collaborative and data-driven apps like gaming, social media, document sharing, and chat.

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The service is also compatible with a variety of browsers and devices, and contains SDKs for iOS, Android, and JavaScript.

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Ques. 1): What is AWS AppSync, exactly?


AWS AppSync is a fully managed service that simplifies the development of GraphQL APIs by taking care of the heavy lifting of securely connecting to data sources such as AWS DynamoDB, Lambda, and others. It's just as simple to add caches to boost performance, subscriptions to support real-time updates, and client-side data storage to keep off-line clients in sync. AWS AppSync adjusts your GraphQL API execution engine up and down to meet API request levels after it's installed.

Organizations select GraphQL to construct APIs because it allows front-end developers to query different databases, microservices, and APIs with a single GraphQL endpoint, allowing them to design applications faster.

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Ques. 2): How does AWS AppSync keep data safe?


Your AWS account stores application data at rest, not in the AWS AppSync service. You can use AWS AppSync's security controls, such as AWS Identity and Access Management (IAM) and Amazon Cognito User Pools, to prevent applications from accessing this data. Additionally, user context can be provided through for authenticated requests so that you can leverage Mapping Templates in AWS AppSync to conduct fine-grained access control logic against your resources.

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Ques. 3): What application developer languages does AWS AppSync support?


iOS, Android, and JavaScript are all supported by AWS AppSync SDKs. Web frameworks like React and Angular, as well as technologies like React Native and Ionic, all support JavaScript. You can also connect to the AppSync GraphQL endpoint using open source clients for other platforms, such as generic HTTP libraries or even simple CURL commands.

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Ques. 4): How can I do complex queries with AWS AppSync?  


When using GraphQL, the data sources accessible to AWS AppSync allow you to fully utilise the capabilities of Amazon DynamoDB, Amazon Elasticsearch Service, and AWS Lambda. DynamoDB returns comprehensive results because to features like indexing and conditional tests, as well as Mapping Templates. Amazon Elasticsearch Service features such as fuzzy searches, geo searches, and more are available to your application. Finally, Lambda may be used to return data from other sources such as Amazon Aurora via serial or batch calls.

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Ques. 5): Can I access my AppSync GraphQL endpoint using my own domain name?


Customers who utilise the AWS AppSync API to access their GraphQl endpoint and real-time endpoint can use custom domain names. Simply submit a domain name that you own and a valid AWS Certificate Manager (ACM) certificate that covers your domain to create a custom domain name in AppSync. You can associate the custom domain name with any available AppSync API in your account once it's been created. You can configure your applications to use the new GraphQL and real-time endpoints after updating your DNS record to point to the AppSync-provided domain name. Without having to update your applications, you may modify the API association on your custom domain at any moment. When AppSync receives a request on the custom domain endpoint, it forwards it to the appropriate API.

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Ques. 6): How can you define a mapping template?


GraphQL requests run as "resolvers" and must be transformed to the appropriate message format for the various AWS Services with which AWS AppSync works. For Amazon DynamoDB, AWS Lambda, and Amazon Elasticsearch Service, a GraphQL query on a field, for example, will need to be transformed into a unique format. For instance, AWS AppSync provides Mapping Templates written in Apache Velocity Template Language (VTL), which allow you to provide custom logic to match your needs. For improved usage, AWS AppSync has built-in templates for the various services and utility functions.

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Ques. 7): How AppSync is used by developers


AWS AppSync enables application developers to declare the data they want to offer to end users and update it in real time, thanks to the GraphQL query language it supports. When compared to updating all data on an app, this helps save money on storage and bandwidth. GraphQL Subscriptions are embedded in application code through AppSync to send real-time data via MQTT over Websockets.

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AWS AppSync may also provision Amazon DynamoDB tables and indexes based on GraphQL schema defined by developers, or it can be used with existing DynamoDB resources.

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Ques. 8): Is GraphQL knowledge required to get started?


No, with a simple UI builder that allows you to write in your data model in seconds, AWS AppSync can instantly configure your whole API, schema, and connect data sources. The endpoint can then be used in a client application right away. For fully functional applications, the console also includes a number of sample schema and data sources.

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Ques. 9): What exactly is GraphQL?


Client apps can use GraphQL to fetch, update, and subscribe to data from servers. The client specifies how the data should be organised when it is delivered by the server in a GraphQL query. This allows the client to query only for the data that it requires, in the format that it requires.

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Ques. 10): Is it possible for AWS AppSync to generate a database for me?


Customers can construct a GraphQL schema by hand or using the console, and AWS AppSync will automatically provide Amazon DynamoDB tables and indexes. It will also connect the data sources to "GraphQL resolvers," allowing you to concentrate solely on the application code and data structures.

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Ques. 11): Is AWS AppSync compatible with my existing AWS resources?


Yes. With AWS AppSync, you can use Amazon DynamoDB, AWS Lambda, and Amazon Elasticsearch Service tables, functions, and domains with a GraphQL schema. Using AWS AppSync, you may add data sources from existing AWS resources and configure interactions with Mapping Templates.

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Ques. 12): Is it possible to import tables from Amazon DynamoDB?


AWS AppSync can automatically construct a GraphQL schema from an existing DynamoDB table, including key schema and index inference. GraphQL queries, modifications, and subscriptions can be utilised without coding after the import is complete. Non-key characteristics from your GraphQL types will also be "auto-mapped" to DynamoDB attributes via AppSync.

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Ques. 13): What kinds of apps can I make with the functionalities that were published today?


AWS AppSync may be used to create mobile apps that can synchronise user and app data between devices, continue to function even when connected, and provide real-time collaborative experiences. There are applications in every industry. Some examples are:

  • Real-time scoreboards in gaming apps
  • Financial data and news feeds
  • Dashboards for customer service
  • Offline usage, shared wallet, and trip or itinerary tracking
  • Content streams and search/discovery/messaging on social media
  • Likes, texting, and geo/proximity awareness are all features of dating applications.
  • Even while disconnected, field service apps must be able to query and perform CRUD activities.
  • Collaboration on documents
  • Shared whiteboards and 3D collaboration
  • Multiple actors in AR/VR (doctors in surgery with observers, teachers and students)
  • Multi-device and multi-modal applications (e.g., Alexa, mobile, web, IoT) that must work offline but reflect the same finally consistent state
  • Presence indicators and conversation history are included in chat apps.

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Ques. 14): What is the definition of a GraphQL Schema?


A GraphQL schema is a description of the data capabilities that the client application has access to. A schema might, for example, specify what queries are possible or how an app can subscribe to data without knowing about the underlying data source. A type system defines schemas, which an application's data model can use.

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Ques. 15): What clients are available for connecting my app to the AppSync API?


To connect to a GraphQL API on AppSync, you can use any HTTP or GraphQL client. The Amplify clients, which are optimised to connect to the AppSync backend, are recommended. Depending on your application's use case, you have a few options:

  • Use the DataStore category in the Amplify client for DynamoDB data sources. It offers the finest developer experience as well as conflict detection and resolution built-in.
  • Use the API (GraphQL) category in the Amplify client for non-DynamoDB data sources in instances where there are no offline constraints.
  • Use the AppSync SDK for non-DynamoDB data sources in instances where you need to work offline.

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Ques. 16): Can I use AWS AppSync to make my data real-time?


Yes. When a mutation happens, the results may be delivered down to clients subscribing to the event stream immediately using either MQTT over WebSockets or pure WebSockets utilising AWS AppSync against any of the data sources.

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