protovalidate-py

Protovalidate is the semantic validation library for Protobuf. It provides standard annotations to validate common rules on messages and fields, as well as the ability to use CEL to write custom rules. It's the next generation of protoc-gen-validate.

With Protovalidate, you can annotate your Protobuf messages with both standard and custom validation rules:

syntax = "proto3";

package acme.user.v1;

import "buf/validate/validate.proto";

message User {
  string id = 1 [(buf.validate.field).string.uuid = true];
  uint32 age = 2 [(buf.validate.field).uint32.lte = 150]; // We can only hope.
  string email = 3 [(buf.validate.field).string.email = true];
  string first_name = 4 [(buf.validate.field).string.max_len = 64];
  string last_name = 5 [(buf.validate.field).string.max_len = 64];

  option (buf.validate.message).cel = {
    id: "first_name_requires_last_name"
    message: "last_name must be present if first_name is present"
    expression: "!has(this.first_name) || has(this.last_name)"
  };
}

Once you've added protovalidate to your project, validation is idiomatic Python:

try:
    protovalidate.validate(message)
except protovalidate.ValidationError as e:
    # Handle failure.

Installation

[!TIP] The easiest way to get started with Protovalidate for RPC APIs are the quickstarts in Buf's documentation. There's one available for Python and gRPC.

To install the package, use pip:

pip install protovalidate

protovalidate is implemented as a Python native extension. We publish wheels for common platforms and you will usually download a pre-built wheel. For others, ensure you have Rust and a C++ compiler available, and it will be automatically built during installation.

Documentation

Comprehensive documentation for Protovalidate is available at protovalidate.com.

Highlights for Python developers include:

The developer quickstart
A comprehensive RPC quickstart for Python and gRPC
A migration guide for protoc-gen-validate users

Additional languages and repositories

Protovalidate isn't just for Python! You might be interested in sibling repositories for other languages:

protovalidate-go (Go)
protovalidate-java (Java)
protovalidate-cc (C++)
protovalidate-es (TypeScript and JavaScript)

Additionally, protovalidate's core repository provides:

Protovalidate's Protobuf API
Conformance testing utilities for acceptance testing of protovalidate implementations

Benchmarks

We include a set of benchmarks to verify different types of validation operations based on pytest-benchmark. You can run them with

$ uv run poe bench

This persists the runs results. It is often helpful to compare benchmark results between runs, for example before and after an optimization. To compare persisted results, use

$ uv run poe bench-compare

Contributing

We genuinely appreciate any help! If you'd like to contribute, check out these resources:

Contributing Guidelines: Guidelines to make your contribution process straightforward and meaningful
Conformance testing utilities: Utilities providing acceptance testing of protovalidate implementations

Legal

Offered under the Apache 2 license.

Metadata

Release files for protovalidate 2.0.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for protovalidate 2.0.0
File	Size	Uploaded
protovalidate-2.0.0.tar.gz	18.9 MB	Aug 19, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for protovalidate 2.0.0
File	Interpreter	ABI	Platform	Reset
protovalidate-2.0.0-cp314-cp314t-win_arm64.whl 2.6 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	Windows ARM64	Details
protovalidate-2.0.0-cp314-cp314t-win_amd64.whl 2.7 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	Windows x86-64	Details
protovalidate-2.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl 10.1 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ x86-64	Details
protovalidate-2.0.0-cp314-cp314t-musllinux_1_2_aarch64.whl 9.6 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ ARM64	Details
protovalidate-2.0.0-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 3.6 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.17+ x86-64	Details
protovalidate-2.0.0-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 3.3 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.17+ ARM64	Details
protovalidate-2.0.0-cp314-cp314t-macosx_11_0_arm64.whl 2.5 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 11.0+ ARM64	Details
protovalidate-2.0.0-cp314-cp314t-macosx_10_12_x86_64.whl 2.7 MB Aug 19, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 10.12+ x86-64	Details
protovalidate-2.0.0-cp310-abi3-win_arm64.whl 2.6 MB Aug 19, 2026	CPython 3.10	abi3	Windows ARM64	Details
protovalidate-2.0.0-cp310-abi3-win_amd64.whl 2.7 MB Aug 19, 2026	CPython 3.10	abi3	Windows x86-64	Details
protovalidate-2.0.0-cp310-abi3-musllinux_1_2_x86_64.whl 10.1 MB Aug 19, 2026	CPython 3.10	abi3	Linux musl 1.2+ x86-64	Details
protovalidate-2.0.0-cp310-abi3-musllinux_1_2_aarch64.whl 9.6 MB Aug 19, 2026	CPython 3.10	abi3	Linux musl 1.2+ ARM64	Details
protovalidate-2.0.0-cp310-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 3.6 MB Aug 19, 2026	CPython 3.10	abi3	Linux glibc 2.17+ x86-64	Details
protovalidate-2.0.0-cp310-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 3.3 MB Aug 19, 2026	CPython 3.10	abi3	Linux glibc 2.17+ ARM64	Details
protovalidate-2.0.0-cp310-abi3-macosx_11_0_arm64.whl 2.5 MB Aug 19, 2026	CPython 3.10	abi3	macOS 11.0+ ARM64	Details
protovalidate-2.0.0-cp310-abi3-macosx_10_12_x86_64.whl 2.7 MB Aug 19, 2026	CPython 3.10	abi3	macOS 10.12+ x86-64	Details

Total release size: 93.3 MB

Release files / protovalidate-2.0.0.tar.gz

Download URL	protovalidate-2.0.0.tar.gz
Size	18.9 MB
Tags	Source
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Download URL	protovalidate-2.0.0-cp314-cp314t-win_arm64.whl
Size	2.6 MB
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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Download URL	protovalidate-2.0.0-cp314-cp314t-win_amd64.whl
Size	2.7 MB
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Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
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Release files / protovalidate-2.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl

Download URL	protovalidate-2.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl
Size	10.1 MB
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp314-cp314t-musllinux_1_2_aarch64.whl

Download URL	protovalidate-2.0.0-cp314-cp314t-musllinux_1_2_aarch64.whl
Size	9.6 MB
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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
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Release files / protovalidate-2.0.0-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	protovalidate-2.0.0-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	3.6 MB
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl

Download URL	protovalidate-2.0.0-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
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Tags	CPython 3.14 CPython 3.14 free-threading Linux glibc 2.17+ ARM64
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp314-cp314t-macosx_11_0_arm64.whl

Download URL	protovalidate-2.0.0-cp314-cp314t-macosx_11_0_arm64.whl
Size	2.5 MB
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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp314-cp314t-macosx_10_12_x86_64.whl

Download URL	protovalidate-2.0.0-cp314-cp314t-macosx_10_12_x86_64.whl
Size	2.7 MB
Tags	CPython 3.14 CPython 3.14 free-threading macOS 10.12+ x86-64
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Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp310-abi3-win_arm64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-win_arm64.whl
Size	2.6 MB
Tags	CPython 3.10 Windows ARM64 abi3
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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp310-abi3-win_amd64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-win_amd64.whl
Size	2.7 MB
Tags	CPython 3.10 Windows x86-64 abi3
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Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

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Release files / protovalidate-2.0.0-cp310-abi3-musllinux_1_2_x86_64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-musllinux_1_2_x86_64.whl
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

Workflow

Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
Publishing logs: github.com/bufbuild/protovalidate-py/actions/runs/32202305636/attempts/1

Artifact

Subject: protovalidate-2.0.0-cp310-abi3-musllinux_1_2_x86_64.whl
SHA-256 checksum: c88442347f2b01fc7a5d67280a99730135310400b039fe63a5ec1581c26ea8b8 Verifying attestations

Release files / protovalidate-2.0.0-cp310-abi3-musllinux_1_2_aarch64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-musllinux_1_2_aarch64.whl
Size	9.6 MB
Tags	CPython 3.10 Linux musl 1.2+ ARM64 abi3
SHA-256 checksum How to use checksums	`be86a8253fd64a250d8e15598fcebdf3b1fd6384f6ef1f1d412b4b5cb7d47686`
BLAKE2b-256 checksum How to use checksums	`8bdd677c2adb9a6ca5e7122a4558c469738c93eb88d720fd291b03a6a6bdb375`
Upload date	Aug 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

Workflow

Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
Publishing logs: github.com/bufbuild/protovalidate-py/actions/runs/32202305636/attempts/1

Artifact

Subject: protovalidate-2.0.0-cp310-abi3-musllinux_1_2_aarch64.whl
SHA-256 checksum: be86a8253fd64a250d8e15598fcebdf3b1fd6384f6ef1f1d412b4b5cb7d47686 Verifying attestations

Release files / protovalidate-2.0.0-cp310-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	3.6 MB
Tags	CPython 3.10 Linux glibc 2.17+ x86-64 abi3
SHA-256 checksum How to use checksums	`fe8c9e237b9f034269f134d4ee0a872689b38e1c8113668a351f9f12bcfcf62e`
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Upload date	Aug 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

Workflow

Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
Publishing logs: github.com/bufbuild/protovalidate-py/actions/runs/32202305636/attempts/1

Artifact

Subject: protovalidate-2.0.0-cp310-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
SHA-256 checksum: fe8c9e237b9f034269f134d4ee0a872689b38e1c8113668a351f9f12bcfcf62e Verifying attestations

Release files / protovalidate-2.0.0-cp310-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
Size	3.3 MB
Tags	CPython 3.10 Linux glibc 2.17+ ARM64 abi3
SHA-256 checksum How to use checksums	`6109644d4d7be9e49e77198deac274881a281e168a0d2edefa38063e4247280e`
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Upload date	Aug 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

Workflow

Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
Publishing logs: github.com/bufbuild/protovalidate-py/actions/runs/32202305636/attempts/1

Artifact

Subject: protovalidate-2.0.0-cp310-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
SHA-256 checksum: 6109644d4d7be9e49e77198deac274881a281e168a0d2edefa38063e4247280e Verifying attestations

Release files / protovalidate-2.0.0-cp310-abi3-macosx_11_0_arm64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-macosx_11_0_arm64.whl
Size	2.5 MB
Tags	CPython 3.10 abi3 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`156efdcc8a7db502f92180f5dff6dea200f8297aa2280abff2b6ca695a62a694`
BLAKE2b-256 checksum How to use checksums	`1dee88f2f3a1bb548809e7c4cb000e0beee86bf3702f47b85009c23c4ecbfd75`
Upload date	Aug 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

Workflow

Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
Publishing logs: github.com/bufbuild/protovalidate-py/actions/runs/32202305636/attempts/1

Artifact

Subject: protovalidate-2.0.0-cp310-abi3-macosx_11_0_arm64.whl
SHA-256 checksum: 156efdcc8a7db502f92180f5dff6dea200f8297aa2280abff2b6ca695a62a694 Verifying attestations

Release files / protovalidate-2.0.0-cp310-abi3-macosx_10_12_x86_64.whl

Download URL	protovalidate-2.0.0-cp310-abi3-macosx_10_12_x86_64.whl
Size	2.7 MB
Tags	CPython 3.10 abi3 macOS 10.12+ x86-64
SHA-256 checksum How to use checksums	`fd00fbe5297165f55aa208159e28eac27db5821bb255a65d53f659dcb4eba0cd`
BLAKE2b-256 checksum How to use checksums	`d6eb3e599ef96878cf389927ad2d041c7c6d7cd76ea8d91a77819523c78d2afc`
Upload date	Aug 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/bufbuild/protovalidate-py
Publishing commit: github.com/bufbuild/protovalidate-py/tree/597a15c3afda8db4504ec8a666dc09cb43fb72be

Workflow

Publishing configuration: github.com/bufbuild/protovalidate-py/blob/597a15c3afda8db4504ec8a666dc09cb43fb72be/.github/workflows/release.yaml
Publishing logs: github.com/bufbuild/protovalidate-py/actions/runs/32202305636/attempts/1

Artifact

Subject: protovalidate-2.0.0-cp310-abi3-macosx_10_12_x86_64.whl
SHA-256 checksum: fd00fbe5297165f55aa208159e28eac27db5821bb255a65d53f659dcb4eba0cd Verifying attestations