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GraphQL is a language that enables you to provide a complete and understandable description of the data in your API. Furthermore it gives clients the power to ask for exactly what they need and nothing more. The project’s website can be found at http://graphql.org/.

There are several advantages of GraphQL. GraphQL is declarative: Query responses are decided by the client rather than the server. A GraphQL query returns exactly what a client asks for and no more. GraphQL is compositional: A GraphQL query itself is a hierarchical set of fields. The query is shaped just like the data it returns. It is a natural way for product engineers to describe data requirements. GraphQL is strongly-typed: A GraphQL query can be ensured to be valid within a GraphQL type system at development time allowing the server to make guarantees about the response. This makes it easier to build high-quality client tools

Creating a graphql server $ mkdir gql-server $ touch server.js $ npm install graphql express express-graphql —save

Creating A Basic GraphQL Server With Express server.js: var express = require('express'); var express_graphql = require('express-graphql'); var { buildSchema } = require('graphql'); // GraphQL schema var schema = buildSchema(type Query { message: String }); // Root resolver var root = { message: () => 'Hello World!' }; // Create an express server and a GraphQL endpoint var app = express(); app.use('/graphql', express_graphql({ schema: schema, rootValue: root, graphiql: true })); app.listen(4000, () => console.log('Express GraphQL Server Now Running On localhost:4000/graphql'));