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JSON to Protobuf Schema

JSON & Data Format · Free Online Tool

Convert JSON to Protobuf .proto message definitions.

By CoderNewbie Team
Success
155 chars
222 chars
syntax = "proto3";

message Root {
  string name = 1;
  int64 age = 2;
  bool active = 3;
  double score = 4;
  Address address = 5;
  repeated string skills = 6;
}

message Address {
  string city = 1;
  string zip = 2;
}

Scalar Inference

int32, int64, double, string, bool mapped from values.

Nested Messages

Objects become named messages, recursively.

repeated & Tags

Arrays become repeated fields; field numbers auto-assigned.

How to Use JSON to Protobuf Schema

  1. 1Paste your input data (JSON, CSV, XML, YAML, etc.) into the input field.
  2. 2The tool automatically processes and validates your data.
  3. 3Review the converted output in the result panel.
  4. 4Copy or download the converted result.

Features

  • ✓100% free — no signup, no subscription, no ads
  • ✓Runs entirely in your browser — data never leaves your device
  • ✓Fast and lightweight — instant results
  • ✓Cross-platform — works on desktop, tablet, and mobile

Frequently Asked Questions

Can I convert large JSON files?

Yes, but performance depends on your browser. Files up to 10MB are generally handled well.

Do you validate the input?

Yes, most tools validate input and show error messages with line numbers for invalid data.

Can I download the converted result?

Yes, most conversion tools provide a download button for the output file.

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