Why CORS (Cross-Origin Resource Sharing)? That is, in our case, the Node.js server hosted at ,ĭoes not tell the browser that request can be made from When this happens, your browser will throw an error as seen earlier. Which is an HTTP header based mechanism that helps the server to tell the browser,įrom which all domain requests can be made (except the same domain). CORS stands for Cross-Origin Resource Sharing, getElementById ( ' root ' ) ) registerServiceWorker () if ( module. registerServiceWorker ' import client from '. App ' import registerServiceWorker from '. If you don’t already have Node, Yarn, and Create React App installed, you can run the following commands:Ĭonst express = require ( ' express ' ) const cors = require ( ' cors ' ) const graphqlHTTP = require ( ' express-graphql ' ) const gql = require ( ' graphql-tag ' ) const from ' react-apollo ' import ' bootstrap/dist/css/ ' import App from '. The quickest way to get started with a React app is to use Create React App. Today I’ll show you how to use Express to create a GraphQL server, as well as how to create a single-page app in React that uses Apollo’s client to query the server. GraphQL is a relatively new standard for defining types and querying data, and there are quite a few different implementations of it, both server-side and client-side. This means you can make the backend as robust as you want while keeping the frontend light by only requesting information needed for the page you’re viewing. When a frontend developer queries the server, only the information asked for gets processed. A GraphQL server can be written in Node and lets you easily create a flexible API using JavaScript classes and functions. GraphQL and React have both become quite popular in the last few years, and it’s safe to say they go together like avocado and toast.
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