Practical and example-driven, GraphQL in Action gives you the tools to get comfortable with the GraphQL language, build and optimize a data API service, and use it in a front-end client application. By working through set up, security, and error handling, you'll lean to create a complete GraphQL server. You'll also unlock easy ways to incorporate GraphQL into your existing codebase so you can offer simple, efficient, and scalable data APIs.Reduce bandwidth demands on your APIs by getting only the results you need--all in a single request! The GraphQL query language simplifies interactions with web servers, enabling smarter API queries that can hugely improve the efficiency of data requests. In GraphQL in Action, you'll learn how to bring those benefits to your own APIs, giving your clients the power to ask for exactly what they need from your server, no more, no less.