Protobuf to JSON Converter
Free online Protocol Buffers (Protobuf) to JSON converter. Encode JSON to Protobuf binary and decode Protobuf binary back to JSON. Paste your .proto schema and data. No sign-up required.
What Is Protocol Buffers (Protobuf)?
Protocol Buffers (Protobuf) is a language-neutral, platform-neutral, extensible mechanism for serializing structured data, developed by Google. It is used extensively in gRPC APIs, inter-service communication, and data storage. Protobuf uses a schema (.proto file) to define message structures, and data is serialized into a compact binary format that is smaller and faster to parse than JSON or XML.
How to Use This Protobuf Converter
- Paste your .proto schema definition in the schema input area.
- The tool automatically parses the schema and lists available message types.
- Select the message type you want to encode or decode.
- To encode: Paste JSON data and click Encode to Protobuf to get hex and Base64 output.
- To decode: Paste hex bytes or Base64 encoded protobuf binary and click Decode to JSON.
Common Use Cases
- Debug gRPC Services — Decode protobuf binary responses from gRPC services to readable JSON for debugging.
- Test Protobuf Schemas — Validate that your .proto schema correctly encodes and decodes sample data.
- Inspect Binary Payloads — Decode protobuf-encoded messages captured from network traffic or logs.