Protobuf to JSON Schema
Convert Protobuf definitions to JSON Schema
Protobuf to JSON Schema is a free online tool from BrowserUtils that convert protobuf definitions to json schema. It runs entirely in your browser — your data never leaves your device. No account required.
How to use Protobuf to JSON Schema
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Protobuf to JSON Schema
Free online Protobuf to JSON converter. Parse Protocol Buffer message definitions and generate JSON Schema or example JSON with proper type mappings. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Protobuf to JSON Schema specs
- Runtime
- 100% client-side (browser)
- Built on
- TextEncoder, TextDecoder, btoa/atob, and encodeURIComponent — all Web Platform APIs
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What protobuf types are mapped?
The converter maps string→string, int32/int64→integer, float/double→number, bool→boolean, bytes→base64 string, repeated fields→arrays, nested messages→nested objects, and enums→string enums.
Does it support proto3 syntax?
Yes, the tool parses proto3 message definitions including nested messages, enums, repeated fields, map types, and oneof constructs.
Can I convert a .proto file to a JSON example?
Yes, paste your .proto message definition and the tool generates both a JSON Schema and an example JSON object with placeholder values matching the defined types.
What is Protocol Buffers used for?
Protocol Buffers (protobuf) is a binary serialization format developed by Google. It is smaller and faster than JSON and is widely used in gRPC services, internal Google APIs, and high-performance data exchange.
Does this Protobuf converter work offline?
Yes, the parsing and conversion run entirely in your browser. No .proto files or data are sent to any server.
Can I convert nested protobuf messages to JSON?
Yes, nested message types are converted to nested JSON Schema objects or nested JSON objects in the example output, preserving the full structure of your protobuf definition.
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