Protocol Buffers to JSON Converter

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Convert Protocol Buffers schema to JSON format with support for field numbers, type mapping, and repeated fields. Perfect for prototyping and testing proto definitions.

✓ Proto3 Support✓ Field Numbers✓ Type Mapping

Protocol Buffers

JSON

Conversion Features

Type Mapping

  • •

    Numeric Types

    int32/64, uint32/64, float, double

  • •

    Basic Types

    string, bool, bytes

  • •

    Repeated Fields

    Array type handling

Output Options

  • •

    Field Numbers

    Optional field ID inclusion

  • •

    Null Values

    Optional null generation

  • •

    Pretty Print

    Formatted JSON output

Common Use Cases

Development

  • • API prototyping
  • • Schema testing
  • • Code generation
  • • Documentation

Testing

  • • Mock data
  • • Test fixtures
  • • Input validation
  • • Contract testing

Integration

  • • gRPC services
  • • REST mappings
  • • Data migration
  • • Schema evolution

Frequently Asked Questions

How are field numbers handled?

Field numbers from the Protocol Buffers schema can optionally be included in the JSON field names. This helps maintain the connection between protobuf definitions and JSON representations, useful for debugging and documentation.

How are repeated fields converted?

Repeated fields in the protobuf schema are converted to arrays in the JSON output. These arrays can be initialized as empty or with null values depending on your settings.

What about default values?

You can choose between generating null values or type-appropriate defaults (0 for numbers, empty string for strings, false for booleans). This flexibility helps when testing different scenarios.

Is the conversion secure?

All conversion happens directly in your browser. No data is sent to any server or stored anywhere. Your Protocol Buffers schema remains completely private and secure.

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