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gRPC Swagger

gRPC Swagger is a free, open-source debugging tool for discovering and calling gRPC methods through Swagger UI.

Place
#9 of 24
Score
6.4
gRPC Swagger's website

What gRPC Swagger is

gRPC Swagger is a free, open-source debugging tool for discovering and calling gRPC methods through Swagger UI. It uses gRPC reflection to scan a service registered by its host and port, then displays method definitions and parameters. The service must have reflection enabled for discovery, though setup does not require changes to proto files or related implementations. Once connected, users can test a method through Swagger UI’s “Try it out” control, supplying request data and headers in JSON format; headers are passed to the gRPC server as metadata. The project runs from a released JAR or can be built from source, and defaults to port 8080. Configuration can enable service listings and set how long an inactive registered service remains before expiration. Its documented API includes service registration, listing, method calls, and Swagger UI documentation. The project is MIT-licensed and can be self-hosted, with API and web platforms. It invites contributions through issues and pull requests.

Good

  • Displays gRPC method and parameter definitions in Swagger UI.
  • Tests methods using JSON request data and headers.
  • Runs from a released JAR or source build.
  • MIT-licensed software is available without charge.

Watch out

  • The gRPC service must have reflection enabled.
  • Default port is 8080.
  • The project is self-hosted.

Who it suits

It suits developers who need a Swagger UI interface for discovering and trying methods on gRPC services. It requires reflection to be enabled on the service being explored.

Verdict

gRPC Swagger offers a focused way to inspect and call reflected gRPC services from Swagger UI. It is useful when reflection is available and a self-hosted debugging tool fits the setup.

Plans and prices

From gRPC Swagger's own pricing page, checked 7 Oct 2026.

All about pricing
PlanPriceWhat it gives you
Open sourceFreeMIT-licensed software

The facts

Each one read from gRPC Swagger's own pages, with the date it was checked.

What it does

API
The documented endpoints include service registration, listing services, calling a gRPC method, and returning API documentation for Swagger UI.checked 4 Oct 2026
Configuration
A setting can enable or disable listing registered services, and another can expire an inactive registered service after a specified number of seconds.checked 4 Oct 2026
Deployment
The README documents running a released JAR or building from source, with port 8080 as the default.checked 7 Oct 2026
Endpoint registration
The tool registers a gRPC endpoint by host and port, then scans for available services.checked 4 Oct 2026
Integrations
The README describes integration with swagger-ui and use of the gRPC reflection feature.checked 7 Oct 2026
Latest listed release
The releases page lists version 0.1.8 as the latest release and describes it as fixing duplicate services after registration.checked 7 Oct 2026
License
The repository provides the software under the MIT License.checked 7 Oct 2026
Metadata
The tool accepts JSON-formatted request data and JSON-formatted headers that it passes as metadata to the gRPC server.checked 7 Oct 2026
Method calls
Users can call a gRPC method through Swagger UI’s “Try it out” button.checked 7 Oct 2026
Method definitions
Swagger UI displays gRPC method and parameter definitions.checked 7 Oct 2026
Method testing
Users can test a gRPC method with the Swagger UI “Try it out” button.checked 4 Oct 2026
Notable requirement
The gRPC service must have reflection enabled for the tool to discover its services and methods.checked 4 Oct 2026
Purpose
gRPC Swagger is a debugging tool that uses gRPC reflection and Swagger UI to list and call gRPC methods.checked 7 Oct 2026
Request format
The request data and headers passed to the gRPC server are supplied in JSON format.checked 4 Oct 2026
Service definitions
Swagger UI displays definitions of gRPC methods and their parameters.checked 4 Oct 2026
Service expiration
A configurable expiration interval can remove a registered service after a period without access.checked 7 Oct 2026
Service listing
A command-line parameter can enable listing registered services through the listServices API.checked 7 Oct 2026
Service registration
Users register a gRPC endpoint by providing its host and port.checked 7 Oct 2026
Setup
The README says users can enable reflection when starting their service without modifying proto files or related implementations.checked 7 Oct 2026
Support
The README invites users to open an issue or pull request to contribute.checked 7 Oct 2026
Support and contributions
The project invites users to open an issue or pull request to contribute.checked 4 Oct 2026

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