Reliable Multi-Protocol API Mocking Beyond HTTP
Mockd mocks HTTP, GraphQL, gRPC, WebSocket, MQTT, SSE, and SOAP APIs at high throughput with record-and-replay, reaching 125 GitHub stars from teams that need to mock more than REST, but its issues show the depth gaps in the non-HTTP protocols: multiple gRPC mocks on one port with different conditions only evaluate the first, imported mocks lose tables and custom operations in named workspaces, and there is no way to inspect or control live WebSocket connections. Teams want one mock server for every protocol they actually use. The wedge is reliable multi-protocol mocking where gRPC, WebSocket, and workspace handling are as solid as HTTP.
Problem Statement
A team builds against gRPC and WebSocket services and adopts a multi-protocol mock server, but multiple gRPC mocks on the same port collapse to the first match, importing mocks into a named workspace drops tables and custom operations, and they cannot inspect active WebSocket connections at runtime. The single-server promise breaks on the exact protocols they needed it for, so they revert to separate, protocol-specific mocking tools.
The Idea
A high-performance mock server that handles gRPC, WebSocket, MQTT, and other protocols as reliably as HTTP, with dependable workspaces and runtime control.
Why Now
Modern systems span gRPC, WebSocket, MQTT, and SSE in 2026, and teams want a single mock server instead of stitching protocol-specific tools, and Mockd's traction shows the demand, but its gRPC, WebSocket, and workspace issues show that making the non-HTTP protocols truly reliable is the unmet need that decides adoption.
Target User
Backend and integration teams testing services across gRPC, WebSocket, MQTT, and HTTP
Target Market
API mocking and testing developer tooling
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