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GraphQL

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description GraphQL Overview

GraphQL is a query language for APIs that allows clients to request exactly the data they need, nothing more and nothing less. Unlike REST, which often over-fetches data, GraphQL provides a single endpoint where the client specifies the required shape of the response. This efficiency is critical for mobile applications and complex UIs.

help GraphQL FAQ

How does GraphQL prevent over-fetching of data compared to REST?

With GraphQL, the client dictates exactly which fields and nested data it needs from a single endpoint, preventing the retrieval of unnecessary information. In contrast, traditional REST APIs often return fixed data structures that may contain excess, unused fields.

What is a GraphQL Schema and what is it used for?

The schema serves as a contract between the server and the client, defining the types of data that can be queried or mutated using the GraphQL query language. It ensures that client requests are validated against the defined types before execution.

Can GraphQL be used with databases other than NoSQL like MongoDB?

Yes, GraphQL is completely database-agnostic and acts as a middle layer between your clients and your data sources. It can fetch data from SQL databases like PostgreSQL, NoSQL databases, or even REST APIs, aggregating them into one response.

What is the difference between a Query and a Mutation in GraphQL?

A Query is used to read or fetch data from the server without modifying state, similar to a GET request in REST. A Mutation is used to modify data on the server, such as adding, updating, or deleting records, akin to POST, PUT, or DELETE requests.

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