> ## Documentation Index > Fetch the complete documentation index at: https://docs.usebruno.com/llms.txt > Use this file to discover all available pages before exploring further. # Overview Whether you're developing your own API or testing a third-party one, you can use Bruno as an **API Testing Client** to send requests and receive responses. With Bruno, you can create, update, delete, and send data with custom parameters and authorization details. When you send a request and receive a response through Bruno, the interface displays the information clearly, allowing you to debug errors, handle responses, and resolve any issues efficiently. homepage In the above example we are sending `Post` request to Bruno echo server with json body. The echo server will respond with same data we sent in a request as a output. ### Getting Started with API Requests in Bruno Bruno supports the following protocols for sending API requests: * [REST API](./REST/overview) * [GraphQL API](./graphql/overview) * [SOAP API](./soap/soap-request) * [gRPC](./grpc/overview) * [WebSocket](./websocket/overview)