AI-Powered gRPC Mocking

AI-Generated gRPC Mock Server from .proto

Upload a .proto file. Get a fully working gRPC mock server with realistic test data in seconds.

Beeceptor turns your gRPC schema into a live mock service. RPC methods, message types, and streaming behaviors are auto-discovered and backed by AI-generated responses that match the contract.

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Try this gRPC specification
GRPC
syntax = "proto3";
package v1;
 
service User {
  rpc GetUser (UserRequest) returns (UserResponse);
}
 
message UserRequest {
  string id = 1;
}
 
message UserResponse {
  string id = 1;
  string username = 2;
  string email = 3;
  string country = 4;
  Address address = 5;
}
 
message Address {
  string street = 1;
  string city = 2;
  string state = 3;
  string zip = 4;
}

How It Works

From .proto file to mock server in 3 simple steps

Step 1
Upload Your Spec

Just upload your .proto file — Beeceptor parses every service, message, field, map, and nested structure.

Step 2
Start Your Mock Server

Beeceptor fetches the service schema, builds mock rules, and auto-handles Google well-known types.

Step 3
Simulate & Iterate

Perfect for testing observability pipelines, event-driven services, or long-lived gRPC calls.

Modern gRPC services evolve fast.
Test data shouldn’t slow you down.

Beeceptor’s new gRPC mock server removes setup overhead, eliminates flaky manual mocks.

Drag & drop your .proto file to get started

or

file.proto

Click "Create Mock Server" button to continue.

Please select a valid file.

Processing your gRPC specification, please wait...

Your Mock Server is Live!

http://localhost:3000

The mock server is ready with AI-generated, realistic data.
Explore API routes, monitor live traffic, and build overrides using mock rules from the dashboard page.

Launch Dashboard

Error

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The Smarter Way to Mock gRPC

Got a .proto file? You’re already ahead.

Beeceptor’s new gRPC mock server removes setup overhead, eliminates flaky manual mocks, and gives your team a predictable environment for development.

Instant Mocks From Any gRPC Spec

Upload your .proto or .protoset definition to instantly generate a gRPC mock server. Beeceptor performs complete introspection and schema analysis.

  • Parses all services, RPC methods, request and response messages.
  • Supports direct upload or remote URLs for .proto and .protoset files.
  • Recognizes Google well-known types, advanced message types, and complex protobuf patterns.

Intelligent Test Data Generation

Beeceptor utilizes a context-aware mock engine with over 300 distinct test data generators.

The engine fully supports maps, arrays, deeply nested types, and binary or bytes fields, applying robust defaults and safe handling for all complex scenarios.

Full Streaming Support

Beeceptor delivers comprehensive support for all major gRPC streaming patterns.

  • Support for unary, server-streaming, client-streaming, and bidirectional (bidi) streaming.
  • Define custom min/max message rules per streaming RPC.
  • Precisely emulate real-world streaming behavior and backpressure.

Rule-Based Behavior Control

Easily calibrate your mock server using advanced, rule-driven behavior controls.

  • Set static or dynamic response payloads.
  • Inject custom response metadata and headers.
  • Simulate response codes and errors.
  • Introduce artificial delays and timeouts.

Built-In Logging & Request Capture

Beeceptor provides transparent logging for every gRPC request and response.

Each binary message is automatically deserialized into human-readable JSON for easy interception, review, and debugging.