A gRPC debugging proxy. Point it at your backend, point your client at Loom, and watch every call decoded in a browser tab.

Your gRPC Client  →  Loom (:9999)  →  Your Backend (:50051)
                          ↓
                    Web Inspector
                  http://localhost:9998

gRPC traffic is binary. Wireshark can't read it. grpcurl is great for one-off calls but you can't watch a flow. I kept running it over and over trying to understand what was happening between services.

Loom sits transparently between your client and backend. It uses Server Reflection to decode every frame on the fly — no .proto files required — and streams the results into a browser UI. You see the JSON payloads, the status codes, how long each call took, and a ready-to-copy grpcurl command to replay any of them.

• Intercepts all four gRPC stream types — unary, server-streaming, client-streaming, bidi
• Auto-decodes using Server Reflection (no proto…