Parse common proto2, proto3 and Editions syntax locally, flag field number, reserved, map, oneof, enum and JSON-name risks, and compare revisions.
Current and older inputs are limited to 2 MiB each. Disk and network imports are not loaded.
Load a sample or paste a .proto to begin
Field inventory, rule findings, ProtoJSON and version compatibility changes will appear here.
Check field rules, ProtoJSON mappings and schema evolution compatibility. Parse common proto2, proto3 and Editions syntax locally, flag field number, reserved, map, oneof, enum and JSON-name risks, and compare revisions. The core workflow is designed to run in your current browser.
Yes. Protobuf / .proto Inspector opens in a modern browser and does not require desktop software installation.
Common use cases include Check forward and backward risks before editing a .proto; Browse messages, enums, services and RPCs quickly.
The core processing workflow is designed to run locally in the browser. Key capabilities include Recognize proto2, proto3, Edition 2023 and Edition 2024 declarations, Check numbers, reserved ranges, duplicates, maps, oneofs and enum zero values, Generate a copyable ProtoJSON example using official type mappings; account, comments, and anonymous analytics may still create normal site requests.
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