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Paste a protobuf payload as base64 or hex and read it, with or without the .proto that produced it. Everything runs in the browser. Without a definition, the payload is decoded straight from the wire format: field numbers, wire types, nested messages, and a reading of every value. The wire format does not carry names or declared types, so where the bytes are genuinely ambiguous the widget lists the other readings instead of picking one silently: a varint that could be a bool or a zigzag sint64, a length-delimited field that parses as a nested message and is also printable text, bytes that could be a packed repeated field. With a definition, protobufjs parses the .proto text at runtime (no codegen, no protoc) and the decoded message is shown as a named tree. The schema-less reading is kept alongside and the two are compared, because protobufjs drops in silence both the fields a definition does not declare and the declared fields that arrive as the wrong wire type. Either one is reported: the first as fields that were dropped, the second as the sign that the payload is probably a different message type. Other conveniences: the encoding is detected rather than asked for (hex wins a tie), hex dumps keep their separators and 0x prefixes, base64url and missing padding are accepted, and a 5-byte gRPC length prefix is recognized and skipped. Payloads are capped at 100,000 characters and 64 KB of bytes, definitions at 50,000 characters. protobufjs is added as a dependency; it lands in the widget's own lazy chunk (132 KB, 38 KB gzipped), so nothing changes for a dashboard that never opens this widget. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K2aiBGNxfoFs9oBpSVBTsE
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Included review availability: Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe change adds a Protobuf Decoder widget with automatic, Base64, and hexadecimal input, schema-free wire decoding, ChangesProtobuf Decoder
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ProtobufDecoderWidget
participant decodePayload
participant decodeWireFormat
participant decodeWithSchema
ProtobufDecoderWidget->>decodePayload: Decode payload and detect encoding
ProtobufDecoderWidget->>decodeWireFormat: Parse wire fields
ProtobufDecoderWidget->>decodeWithSchema: Decode selected schema message
decodeWithSchema-->>ProtobufDecoderWidget: Return decoded fields and comparisons
decodeWireFormat-->>ProtobufDecoderWidget: Return raw fields or errors
Merge Risk: ⚪ Minimal · up to The decoder addition has no identified unresolved issue that should block merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 4
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Inline comments:
In `@src/widgets/protobuf-decoder/payloadBytes.ts`:
- Line 25: Update the NOISE/decodePayload preprocessing so 0x markers are
preserved until the encoding is resolved, while retaining repeated 0x support
and auto-mode hex precedence through the proposed hexCandidate logic. Ensure
explicit Base64 inputs such as 0x and 0xAA are decoded without stripping their
content, and auto-detected Base64 input such as 0x+/ remains intact when it is
not valid preferred hex; add regression coverage for these cases and prefixed
hex input.
In `@src/widgets/protobuf-decoder/ProtobufDecoderWidget.tsx`:
- Around line 71-72: Update the output logic around schemaDecode so schema mode
branches first and returns the formatted schema JSON only when schemaDecode.ok
is true; otherwise return an empty string. Preserve the existing wire.fields
formatting only for non-schema modes, ensuring the Copy action has no content
after schema decoding fails.
In `@src/widgets/protobuf-decoder/wireFormat.ts`:
- Around line 222-235: The group branch in parseFields must continue decoding
after a matching end-group tag and report the group’s actual consumed range.
Extend ParseOutcome with the stopping offset, set the group byteLength through
that end-group offset, and resume the outer loop from it instead of returning
and dropping subsequent fields.
- Around line 217-220: Add the existing MAX_DEPTH guard to the wireType === 3
group branch before calling parseFields, matching the protection used by the
length-delimited path. Ensure overly deep nested groups are rejected safely
instead of recursing until a stack overflow, while preserving normal matching
end-group parsing.
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README.mdpackage.jsonsrc/widgets/protobuf-decoder/ProtobufDecoderWidget.test.tsxsrc/widgets/protobuf-decoder/ProtobufDecoderWidget.tsxsrc/widgets/protobuf-decoder/definition.tssrc/widgets/protobuf-decoder/payloadBytes.test.tssrc/widgets/protobuf-decoder/payloadBytes.tssrc/widgets/protobuf-decoder/protoSchema.test.tssrc/widgets/protobuf-decoder/protoSchema.tssrc/widgets/protobuf-decoder/wireFormat.test.tssrc/widgets/protobuf-decoder/wireFormat.tssrc/widgets/registry.ts
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- Keep `0x` until the encoding is settled. `0`, `x` and `X` are all base64 characters, so stripping the hex marker up front rewrote base64 payloads: '0x' became the empty-input error and '0xAA' decoded as 'AA'. The marker is now removed only from the hex candidate, which keeps auto mode reading '0x08, 0x96' as hex. - Guard the group branch with MAX_DEPTH. A group tag costs one byte per level, so a run of 0x0b bytes recursed once per byte and overflowed the stack with an uncaught RangeError. - Keep decoding after a group closes, and charge the group only its own bytes. The branch returned instead of continuing, so every field after the end-group tag was silently dropped, and byteLength claimed the group covered the rest of the payload. parseFields now reports the offset it stopped at, an end-group tag closes the group it belongs to, and a mismatched or unclosed group is reported rather than passing as clean. - Empty the Copy button in schema mode when the decode failed, instead of falling through to the schema-less rendering the pane is not showing. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K2aiBGNxfoFs9oBpSVBTsE
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All four CodeRabbit findings addressed in d4efece.
One thing worth flagging from the third fix: requiring the nested-message probe to consume its region exactly ( Preview rebuilt from this branch: https://claude.ai/artifact/33Hm2jEM2dD4ygi4Df8DLV Generated by Claude Code |
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Paste a protobuf payload as base64 or hex and read it, with or without the .proto that produced it. Everything runs in the browser.
Preview: https://claude.ai/artifact/33Hm2jEM2dD4ygi4Df8DLV (a build of this branch, opening on the new widget)
Without a definition
The payload is decoded straight from the wire format: field numbers, wire types, nested messages, and a reading of every value.
The wire format carries no names and no declared types, so where the bytes are genuinely ambiguous the widget lists the other readings rather than picking one silently:
bool, a signedint64, or a zigzagsint64;fixed32/fixed64shown as both integer and float.A payload that gives out mid-way keeps everything read before that point, with the byte offset and the likely reason (not protobuf, truncated, or still carrying a transport header).
With a definition
protobufjsparses the .proto text at runtime, so there is no codegen and no protoc: the definition is pasted next to the payload. Messages are listed in a picker (nested ones included, fully qualified), fields keep the names the .proto spelled them with, and enums come back as names.The schema-less reading is kept alongside and the two are compared, because protobufjs drops two things in silence:
Personpayload as anAddressreturns{}with no error at all, and the widget is what explains why.Imports are the one thing that cannot work offline (protobufjs resolves them through a file system). The bundled
google/protobuf/*types resolve; anything else is reported as the missing piece it is, rather than as a cryptic parser error.Reading what people actually paste
0xprefixes, newlines and commas. Base64 accepts base64url and missing padding.Dependency
protobufjs(the only runtime .proto parser of its kind) lands in this widget's own lazy chunk: 132 KB, 38 KB gzipped. A dashboard that never opens the widget never loads it.Testing
npx tsc -b --noEmit,npm run lint(only the two pre-existingPageColorPicker.tsxwarnings),npm test: 989 passing, 52 of them new across the three pure modules and the widget.The wire decoder is tested against payloads encoded by protobufjs itself, so the schema-less reading is checked against a real encoder rather than against my own expectations, plus hand-written bytes for the edge cases (field number 0, undefined wire types, truncation, 30 levels of nesting against the depth guard).
Also driven in a real Chromium: the sample decodes field by field with its alternative readings, the .proto mode names the same fields, and a gRPC-framed payload carrying an undeclared field 9 shows both the frame note and the dropped-field warning.
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Generated by Claude Code
Summary by CodeRabbit
New Features
.protoschema-based decoding.Documentation