What Is GraphQL?
GraphQL is a query language for your APIs, as well as a runtime for fulfilling those queries with your existing data. In simple words, you describe your data using a schema; you ask for only what you want, and in turn, you get predictable results. By leveraging this technology, it empowers the client to request precisely what they require, according to the defined schema and query. People widely use GraphQL as an alternative to the REST API architecture due to its growing popularity.
Key Features of GraphQL
- Strongly typed schema: GraphQL employs a schema to specify the categories of data that are queryable. This schema functions as a contractual agreement between the client and server, guaranteeing a clear understanding of the requested data and its expected return.
- Single endpoint: GraphQL APIs use a single endpoint for all queries and mutations, unlike REST APIs.
- Hierarchical: GraphQL client queries are similar to the JSON data returned by the API, making it simple and intuitive while making the network API call and understanding complex data structures.
- Client-specified queries: Web or mobile clients have the leverage to specify exactly what they need in terms of data, which reduces the amount of data transferred over the network and improves the overall application performance.
- Real-time capabilities: With GraphQL subscriptions, clients can receive real-time updates to data.
A Simple Example of GraphQL
Here is a simple example to demonstrate how GraphQL works. Suppose we have a simple GraphQL server that manages information about books and authors.
https://dzone.com/articles/understanding-graphql-an-introduction
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