Protobuf Support

APXY can decode Protocol Buffer (Protobuf) encoded request and response bodies when you provide the corresponding .proto schema files. This makes it possible to inspect gRPC and other Protobuf-based API traffic in human-readable form.

CLI

apxy tools protobuf … (add-schema, list-schemas, remove-schema, decode) is documented in CLI Reference → Tools.

Quick example:

apxy tools protobuf add-schema \
  --name "user-service" \
  --file ./protos/user.proto

Use Cases

Inspect gRPC traffic

Register your service protos, capture traffic, then decode request or response bodies by record ID (decode subcommand in the Tools reference).

Debug mobile app APIs

Many mobile apps use Protobuf for compact payloads. Register the schema, then decode captured records to inspect fields end to end.