Let’s understand the GraphQL components and the way they communicate with each other. The entire application components can be categories in to server side and client-side components.
1. Server-side Components - GraphQL server forms the core component on the server side and allows to parse the queries coming from GraphQL client applications. Apollo Server is most commonly used implementation of GraphQL specification. Other essential components are
a. Schema - A GraphQL schema is at the center of any GraphQL server implementation and describes the functionality available for the clients.
b. Query - A GraphQL query is the client application request to retrieve data from database or legacy API's.
c. Resolver - Resolvers provide the instructions for fetching the data for the given query. They resolve query to data by defining resolver functions.

2. Client-side Components - Client-side components are used to fetch data from GraphQL server. Client-side components are also used for testing & development of graphql apis.
a. GraphiQL - Browser based interface for editing and testing GraphQL queries and mutations.
b. ApolloClient - Best tool to build GraphQL client applications. Integrates well with all javascript front-end.

#graphqlapi #graphql #graphqlserver

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