Basic Components of GraphQL

Basic Components of GraphQL

GraphQL is a query language for APIs and a runtime for executing those queries by using a type system we define for our data. Unlike traditional REST APIs, where clients have limited control over the structure of the responses, GraphQL allows clients to request only the data they need, in the format they need it....

1. Query

A GraphQL query is a type of read operation. It is a request for specific data from a server. Clients use queries to specify the structure of the response they need. The server processes the query and returns the requested data....

2. Mutation

A mutation in GraphQL is used for write operations, such as creating, updating, or deleting data on the server. It allows clients to modify data. While a query is used for read operations, a mutation is specifically designed for write operations. This distinction helps in clearly defining the intent of an operation. Mutations can modify data in the server’s database, unlike queries which only fetch data. They are used when you need to change the state of the server or persist new data. It’s considered a good practice to use mutations for write operations, even though queries can technically be used to modify data as well. Using mutations explicitly indicates that the operation is intended to change data....

Combined Schema With Query and Mutations

Here is the schema with both query & mutation (overall code)...

Conclusion

In this post we’ve learnt the basics of GraphQL and the key differences between Query, Mutation and it’s purposes with an sample blog post example.In this post we’ve seen how to define query, mutation, and writing resolvers for them....