What is graphiql?

GraphiQL is an in-browser tool that lets you explore and test GraphQL APIs without writing code separately. Think of it like Postman, but specifically designed for GraphQL. You open it in your browser, type in a query, and immediately see the results, all while getting smart suggestions, error checking, and documentation on the fly. When you use GraphiQL, you're working with three panels: a query editor on the left where you write your request, a variables panel for passing in dynamic data, and a results panel on the right that shows what the API returned. The tool watches what you type and offers autocomplete suggestions for fields and types, highlights syntax errors in real time, and even auto-fills parts of your query automatically. It also pulls up documentation about what data the API offers, so you don't have to hunt through separate docs. Developers use GraphiQL whenever they need to debug a GraphQL API or explore what it can do. A backend engineer might set it up on their development server to test new queries before a frontend team uses them. A frontend developer might use it to understand what fields are available before writing code. It's especially useful because GraphQL APIs can be complex, the autocomplete and built-in docs save you from constantly flipping between your IDE and documentation. To set it up, you install it from npm and embed it as a React component in a web page, then point it to your GraphQL endpoint. If you're already using Express.js for your server, there's a companion package that automatically serves GraphiQL for you. You can customize the look and feel, add buttons to the toolbar, or change how it behaves through configuration options. The README includes a live demo using Star Wars data so you can try it out before implementing it yourself.