What is GraphiQL?

GraphiQL is the official in-browser IDE for GraphQL — an interactive playground where you can write, validate, and execute GraphQL queries against a server. It is typically served by the GraphQL server at the same endpoint (e.g., /graphql) and uses introspection to provide: autocomplete for fields and types, syntax highlighting, inline documentation, query history, and variable and header editing. A simple query: type { users { id name } } and press Ctrl+Enter. Apollo Sandbox is a more modern alternative that works without a local server. GraphQL Playground was another popular option (now merged into Apollo Sandbox). All use introspection under the hood and make GraphQL API exploration significantly easier than REST.