GraphQL Schema to Protobuf Converter
Convert GraphQL SDL types, inputs, enums, and queries into standardized Proto3 schemas and gRPC services in your browser.
At a glance
GraphQL Schema to Protobuf Converter transforms GraphQL SDL types, inputs, enums, and operations into valid Protocol Buffers (Proto3) messages, enums, and gRPC services. It maps scalar types, repeated arrays, enum values with zero-index enums, and queries/mutations to RPC methods in browser memory.
100% Client-Side In-Browser GraphQL to Protobuf Transpiler
Compile GraphQL SDL schemas, types, inputs, enums, queries, and mutations directly into Protocol Buffers (Proto3) messages and gRPC services with zero server uploads.
Why Use This GraphQL Schema to Protobuf Converter?
How to Use GraphQL Schema to Protobuf Converter
Paste GraphQL SDL Schema
Paste your GraphQL types, inputs, queries, or mutations into the editor, or choose a preset.
Configure Protobuf Options
Set your target Proto3 package name, toggle gRPC service generation, and choose indentation depth.
Copy or Export .proto
Instantly copy the generated Proto3 schema or download it as a .proto definition file.
GraphQL SDL to Proto3 example
Demonstrates converting a GraphQL User type and Query operation into Proto3 messages and a gRPC service.
type User {
id: ID!
name: String!
age: Int
}
type Query {
getUser(id: ID!): User
}
syntax = "proto3";
package api.v1;
message User {
string id = 1;
string name = 2;
int32 age = 3;
}
message GetUserRequest {
string id = 1;
}
service ApiService {
rpc GetUser (GetUserRequest) returns (User);
}
Technical Specifications & Engine Details
| Specification | Details |
|---|---|
| Supported Formats | Text / Input → Rendered Result |
| Execution Mode | 100% Client-Side In-Browser (client) |
| Browser Requirements | Requires modern web browser with ECMAScript 6+ and standard DOM Web APIs. |
| Performance Constraints | Client browser memory limit (typically 1–2 GB RAM); processing speed depends on client hardware. |
100% Client-Side Privacy Guarantee
Your schema files remain strictly on your local device. Zero data is transmitted to external servers.
Frequently Asked Questions
How are GraphQL Query and Mutation operations converted to Protobuf?
Why does the generated Proto3 enum include an UNSPECIFIED entry?
How are GraphQL lists and non-null types handled?
Is any schema data sent to a server?
Methodology
This tool runs entirely in your browser. The example above shows a representative input and the result it produces.
Last updated .