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How to Convert Go to Protobuf - Step by Step Guide

Step 1

Input Your Go Struct Definitions

Start by entering your Go struct definitions that need to be converted to Protocol Buffer schema:

•
Paste Go code: Copy struct definitions from your Go applications or packages
•
Upload Go file: Upload .go files containing struct definitions
•
Use sample data: Click "Sample" to load example Go structs and see the conversion

Example: Go Struct Input

Here's a typical Go struct definition ready for protobuf conversion:

package main

type User struct {
    ID       int32    `json:"id"`
    Name     string   `json:"name"`
    Email    string   `json:"email"`
    Roles    []string `json:"roles"`
    Active   bool     `json:"active"`
    Profile  UserProfile `json:"profile"`
}

type UserProfile struct {
    Department      string   `json:"department"`
    ExperienceYears int32    `json:"experience_years"`
    Skills          []string `json:"skills"`
}
Step 2

Automatic Schema Generation

The tool automatically analyzes your Go structs and generates a corresponding Protocol Buffer schema:

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Type mapping: Automatically converts Go types to protobuf types (string, int32, bool, etc.)
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Field numbering: Assigns sequential field numbers for protobuf schema
•
Nested structures: Handles nested structs and converts them to nested messages
•
Array detection: Automatically adds "repeated" keyword for Go slices and arrays

Example: Generated Protobuf Schema

The same Go structs, now converted to protobuf schema:

syntax = "proto3";

package main;

message User {
  int32 id = 1;
  string name = 2;
  string email = 3;
  repeated string roles = 4;
  bool active = 5;
  UserProfile profile = 6;
}

message UserProfile {
  string department = 1;
  int32 experience_years = 2;
  repeated string skills = 3;
}
Step 3

Copy or Download Protobuf Schema

Get your generated protobuf schema ready for use! Multiple export options available:

•
Copy to clipboard: One-click copying for immediate use in your projects
•
Download as .proto: Save as a .proto file for your gRPC services
•
Integration ready: Perfect for microservices, API definitions, and cross-language communication

Example: Generated Protobuf Schema

The same Go structs, now converted to protobuf schema:

syntax = "proto3";

package main;

message User {
  int32 id = 1;
  string name = 2;
  string email = 3;
  repeated string roles = 4;
  bool active = 5;
  UserProfile profile = 6;
}

message UserProfile {
  string department = 1;
  int32 experience_years = 2;
  repeated string skills = 3;
}

Frequently Asked Questions

Why convert Go structs to Protobuf?

Converting Go structs to Protobuf enables efficient serialization, cross-language compatibility, and is essential for building gRPC services and microservices architectures with Go.

What Go types are supported?

This tool supports all basic Go types (string, int32, int64, float32, float64, bool), slices (converted to repeated fields), and nested structs (converted to nested messages).

Can I convert multiple Go structs at once?

Yes! The tool automatically detects and converts all struct definitions in your input, including nested structs, and generates corresponding protobuf messages.

How are Go field names converted?

Go field names (typically CamelCase) are automatically converted to snake_case following protobuf naming conventions. For example, "ExperienceYears" becomes "experience_years".

Is this Go to Protobuf converter completely free?

Yes, completely free with no file size limits, no registration required, and unlimited usage. All conversion features are available at no cost.