Author: K Z

We have used Apollo Server to build graphql specification on server side. It is quick and easy to build production ready GraphQL server. Now let us understand the client side.…

React is a Javascript library for building user interfaces. This chapter explains how one can integrate GraphQL with a React application. Illustration The quickest way to set up a react…

Web applications send and retrieve data asynchronously (in the background). AJAX allows websites to load content onto the screen without refreshing the page. jQuery provides several methods for AJAX functionality…

While adding or modifying data, it is important to validate the user input. For example, we may need to ensure that the value of a field is always not null.…

In this chapter, we will learn mutation queries in GraphQL. Mutation queries modify data in the data store and returns a value. It can be used to insert, update, or…

A GraphQL operation can either be a read or a write operation. A GraphQL query is used to read or fetch values while a mutation is used to write or…

Resolver is a collection of functions that generate response for a GraphQL query. In simple terms, a resolver acts as a GraphQL query handler. Every resolver function in a GraphQL…

A GraphQL schema is at the core of any GraphQL server implementation. It describes the functionality available to the client applications that connect to it. We can use any programming…

GraphQL is a strongly typed language. Type System defines various data types that can be used in a GraphQL application. The type system helps to define the schema, which is…

In this chapter, we will create a simple API that returns a greeting message, HelloWorld, and access it using GraphiQL. Example This example is based on NodeJS, Express and Apollo…