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Highlight .proto files. Free online tool, no login, no sign-up.

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Usage Guide & Tech FAQ

Usage Guide

  1. Paste Protobuf definitions (schema).
  2. Use the viewer to inspect messages, fields and relationships.
  3. Use highlighting to understand structure and compare changes.
  4. Copy the output for docs/code usage.
  5. For multi-file imports, temporarily merge into one file if the tool lacks a virtual FS (watch package clashes).
  6. Review `reserved`/`deprecated` fields to avoid reusing retired tags.
  7. Document oneof/map/Any carefully for compatibility across services.
  8. Include `service` definitions when reviewing gRPC streaming and deadlines.
  9. Compare syntax/edition upgrades against codegen plugins before rollout.
  10. Re-validate with `protoc` or buf after browser-side review.
  11. Read the title and description first to confirm this utility matches your task (avoid using the wrong tool and misinterpreting output).
  12. Paste or type input in the editor; if a sample/template is provided, load it first to learn the expected output shape.

Related Tech Knowledge

  • Protobuf uses .proto syntax to describe messages and fields.
  • Field types and tag numbers affect serialization layout.
  • Parsing and highlighting run in the browser.
  • Missing braces/semicolons can lead to parse errors.
  • Text schema is not the binary wire format; this layer is about `.proto` text.
  • Never recycle field numbers—doing so breaks backward compatibility.
  • JSON mapping and proto3 optional semantics depend on language plugins—check the matrix.
  • Custom options may not be highlighted but can still compile with protoc.
  • Huge schemas can slow browser parsing; split modules for review.
  • Converting to/from OpenAPI/JSON Schema may lose constraints—fill gaps manually.
  • Core parsing and computation run in your browser; by default your raw business payload is not persisted to this site’s servers (see on-page privacy notes).
  • The pipeline is typically: read input → parse (lexical/syntactic/structured) → transform → render; failures aim to be diagnosable.