What is Protobuf to TypeScript Interface Generator?
This tool converts Protocol Buffer (.proto) definitions to TypeScript interfaces and types. Protocol Buffers is Google's language-neutral serialization format used widely in gRPC microservices. The generated TypeScript code provides type-safe representations of your Protobuf messages, enums, and nested structures for frontend and Node.js applications.
How to Use
- Paste your .proto file content into the input area
- Configure options: optional fields style, export keyword, enum union types
- Click "Generate TypeScript" to convert
- Copy the generated TypeScript interfaces and types into your project
Why Use This Tool?
Tips & Best Practices
- Use "enum union types" for a more TypeScript-idiomatic approach with string unions
- Enable "optional fields" for cleaner interfaces (field?: Type instead of field: Type | undefined)
- For oneof fields, the generator creates discriminated union types for type-safe narrowing
- Map fields are converted to Record<Key, Value> for proper TypeScript typing
Frequently Asked Questions
What is Protocol Buffers (Protobuf)?
Protocol Buffers is a language-neutral, platform-neutral extensible mechanism for serializing structured data, developed by Google. It is widely used for defining data structures and RPC services, especially in gRPC-based microservices architectures.
How are Protobuf types mapped to TypeScript?
Protobuf scalar types map to TypeScript types: string → string, int32/int64/sint32/sint64/fixed32/fixed64/sfixed32/sfixed64 → number, bool → boolean, float/double → number, bytes → Uint8Array. Enum types can be mapped to TypeScript enums or union types depending on your preference.
How are Protobuf messages converted to TypeScript?
Each Protobuf message becomes a TypeScript interface. Fields within the message become properties of the interface. Repeated fields become arrays (Type[]), optional fields can be typed as Type | undefined or optional Type?: Type, and map fields become Record<Key, Value>.
How are Protobuf enums handled?
By default, Protobuf enums are converted to TypeScript enum declarations. If you prefer union types (e.g., type Status = "ACTIVE" | "INACTIVE"), you can enable the "Use enum union types" option for a more TypeScript-idiomatic output.
Is my Protobuf data sent to a server?
No, all processing happens entirely in your browser. Your .proto definitions never leave your device. The conversion is performed client-side using a built-in parser.