proto-schema-parser
A Pure Python Protobuf .proto Parser
Decision gist · record as of 2026-08-14
Yes, if you need to programmatically parse or generate Protobuf schemas. The package is stable, has no known vulnerabilities, and handles modern Protobuf syntax including editions. The aging maintenance status (282 days since last release) is a minor concern for long-term support, but the core functionality is mature and unlikely to require frequent updates unless Protobuf itself introduces breaking changes.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later.
- Low friction installation with a single pure-Python runtime dependency (antlr4-python3-runtime).
- Maintenance status is aging—last release was 282 days ago—so expect slower response to issues, though no active problems are evident.
License · maintenance · safety
MIT (permissive) — MIT license is permissive, allowing commercial and private use with minimal restrictions; you may use, modify, and distribute this package freely as long as you include the license notice.
last release 2025-11-05 (282 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 630,224 downloads/mo, #5,663 on PyPI
Alternatives
Verify before relying
pip install proto-schema-parser
from proto_schema_parser.parser import Parser
from proto_schema_parser.generator import Generator
text = 'syntax = "proto3";\nmessage Example { string field = 1; }'
ast = Parser().parse(text)
proto_string = Generator().generate(ast)- Performance characteristics when parsing large or deeply nested .proto files
- Completeness of support for all proto2/proto3 language features beyond those listed
- Whether the autogenerated lexer/parser from Buf's grammar is kept in sync with upstream changes
What it is and what it does
Proto Schema Parser is a pure-Python library that reads Protobuf schema files and converts them into an abstract syntax tree (AST) for programmatic inspection and manipulation. It uses ANTLR4-based lexer and parser rules autogenerated from Buf's grammar files to handle the conversion. The library also provides a Generator class to write AST objects back to valid Protobuf schema strings, making it useful for tools that need to read, analyze, or transform .proto files without invoking the official protoc compiler.
The package supports proto2 and proto3 syntax, as well as the newer protobuf editions (2023 and 2024). It preserves comments, handles all major schema constructs (messages, fields, enums, services, imports, options), and works with advanced features like oneof, map types, groups, and stream RPC definitions. A developer would use this when building code generators, schema validators, documentation tools, or any system that needs to parse and understand Protobuf schemas as data structures.
Use it for
- Build a code generator that reads .proto files and emits client libraries in a custom language
- Validate Protobuf schemas against organizational naming or structure conventions
- Extract documentation or metadata from .proto files for API documentation systems
- Transform or migrate Protobuf schemas between proto2, proto3, and edition syntax
- Analyze message definitions to enforce backward compatibility rules
- Generate type stubs or schema diagrams from Protobuf definitions
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to programmatically parse or generate Protobuf schemas.
The package is stable, has no known vulnerabilities, and handles modern Protobuf syntax including editions. The aging maintenance status (282 days since last release) is a minor concern for long-term support, but the core functionality is mature and unlikely to require frequent updates unless Protobuf itself introduces breaking changes.
Install
proto-schema-parser on PyPI
Before you install
Low friction installation with a single pure-Python runtime dependency (antlr4-python3-runtime). Maintenance status is aging—last release was 282 days ago—so expect slower response to issues, though no active problems are evident.
Requires Python 3.9 or later.
License in practice
MIT license is permissive, allowing commercial and private use with minimal restrictions; you may use, modify, and distribute this package freely as long as you include the license notice.
Quickstart
pip install proto-schema-parser
from proto_schema_parser.parser import Parser
from proto_schema_parser.generator import Generator
text = 'syntax = "proto3";\nmessage Example { string field = 1; }'
ast = Parser().parse(text)
proto_string = Generator().generate(ast)Verify before relying
- Performance characteristics when parsing large or deeply nested .proto files
- Completeness of support for all proto2/proto3 language features beyond those listed
- Whether the autogenerated lexer/parser from Buf's grammar is kept in sync with upstream changes
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageantlr4-python3-runtime |
| Maintenance | Aging 282 days since the last release |
| First released | |
| Downloads | 630,224 / month, #5,663 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: proto_schema_parser-2.1.0-py3-none-any.whl
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See also pure-protobuf · pbtools · protobuf-py · protobuf-decoder · aristaproto · sentry-protos · betterproto · opensearch-protobufs · hatch-protobuf · protoletariat