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What is GraphQL?

GraphQL is a specification that describes a declarative query language in which web and mobile clients can use to ask an API for the exact data they want.

GraphQL core concepts

Schema: Is the center of GraphQL implementation. It describes the functionality available to the clients which are connecting to it.

SDL: Schema Definition Language or SDL is the type system that’s used to define the schema of an API.

Query:  Is an API request made by the client machine application. It supports augments and points to arrays. Query is used to read or fetch values.

Mutation: Is a way to change the dataset in GraphQL. It modifies data in the data store and returns a value. Mutations help you to insert, update, or delete data.

Graphql vs Rest

GraphQL and Rest have several differences. Here is a list with the most important. 

Characteristics of Rest:

  • Fast client-side requirements are not well suited to Rest's static nature.
  • Queries are made at various endpoints (URL).
  • Download unnecessary information.
  • Several endpoints (URL) must be consulted to obtain the information that is being sought.

Characteristics of GraphQL:

  • Single endpoint (URL)
  • Graphql uses a strongly typed system to define the capabilities of an API.
  • Schemas serve as a contract between the client and the server.
  • The Front end and the Back end can work completely independently.

Recommend resources to learn more about GraphQL

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