Offline engine (processed locally)TEXT v1.0.0 Spec

JSON Schema to Protobuf

v1.0.0

Convert your JSON Schema into high-quality Protocol Buffers (proto3) definitions. This free online converter maps JSON types to proto types, handles nested messages, enums, and repeated fields. Perfect for microservices, gRPC APIs, and sharing data schemas across systems. No installation required, works directly in your browser.

Live sync—ms

JSONInput (JSON)Invalid

lines: 1chars: 28Size: 28 BUTF-8

TEXTOutput (TEXT)

Auto-generated

Converted output will appear here

lines: 0chars: 0Size: 0 BUTF-8

Size change: -100.00%TOML compliant: v1.0.0

Tool guide

Accurate conversion

Input is processed by this tool’s dedicated converter.

Local processing

Your input is processed in your browser and is not uploaded.

Ready-to-use output

Copy the result or save it as a file.