API Master
Build, save, and test API requests — REST, GraphQL, WebSocket, SSE, and gRPC — organized by project, with one-click code generation.
Select or create a project
Select or create an endpoint on the left to get started.
Heads up: browsers don't allow custom headers on WebSocket handshakes. These headers won't actually be sent — use a query string or subprotocol for auth instead.
No file chosen (not persisted between sessions)
Sends a plain POST with a JSON body to URL + path — works against grpc-gateway / Envoy JSON-transcoding proxies, not a raw gRPC server.
Schema generation is best-effort: it infers types by walking your JSON payload or last response, so unusual or mixed-shape data may need manual cleanup.
Output