---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: protoduck
excerpt: |
  DuckDB Community Extensions
  Deserialize Protocol Buffer messages stored in DuckDB columns

extension:
  name: protoduck
  description: Deserialize Protocol Buffer messages stored in DuckDB columns
  version: 0.1.3
  language: Rust
  build: cmake
  license: MIT
  excluded_platforms: "wasm_mvp;wasm_eh;wasm_threads"
  requires_toolchains: "rust;python3"
  maintainers:
    - fcsnk

repo:
  github: fcsnk/protoduck
  ref: 5473d9573eb34e91a7c97d3d3d0ecb2ce311c715

docs:
  hello_world: |
    INSTALL protoduck FROM community;
    LOAD protoduck;

    -- Register a protobuf schema at runtime
    SELECT proto_schema_add('
        syntax = "proto3";
        package demo;
        message Person {
            string name = 1;
            int32 age = 2;
        }
    ');

    -- Decode a protobuf BLOB to JSON
    SELECT proto_to_json(data, 'demo.Person') FROM people;

    -- Extract a single field via dot-notation path
    SELECT proto_get(data, 'demo.Person', 'name') FROM people;
  extended_description: |
    ProtoDuck is a DuckDB extension for deserializing Protocol Buffer messages
    stored directly in table columns (BLOBs), rather than from files. It is aimed
    at querying protobuf-encoded payloads in data lakes and analytics pipelines.

    Schemas are registered at runtime via `proto_schema_add` (from `.proto`
    source) or `proto_schema_add_binary` (from a compiled `FileDescriptorSet`).
    Once registered, messages can be decoded to JSON with `proto_to_json` /
    `proto_decode`, or individual fields can be pulled out with `proto_get`
    using a path syntax that supports nested messages, repeated fields
    (`items[0]`), and maps (`metadata["key"]`).

    All protobuf scalar types, enums, oneofs, maps, and nested messages are
    supported.

extension_star_count: 1
extension_star_count_pretty: 1
extension_download_count: 785
extension_download_count_pretty: 785
image: '/images/community_extensions/social_preview/preview_community_extension_protoduck.png'
layout: community_extension_doc
---
### Compatibility Matrix

This table covers all DuckDB releases that have not reached [end-of-life](https://duckdb.org/release_calendar), including LTS releases, and shows the 2 most recent patch releases of each. Older patch releases are not listed, but the extension may be available for them as well.

<div class="extension_compatibility_table"></div>

| Platform | 1.4.4 | 1.4.5 | 1.5.5 | 1.5.6 | 2.0.0 |
| :--- | :---: | :---: | :---: | :---: | :---: |
| Linux AMD64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| Linux ARM64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| macOS AMD64 | ❌ | ❌ | ✅ | ❌ | ❌ |
| macOS ARM64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| Windows AMD64 | ❌ | ❌ | ✅ | ❌ | ✅ |
| Windows ARM64 | ❌ | ❌ | ❌ | ❌ | ❌ |
| WebAssembly | ❌ | ❌ | ❌ | ❌ | ❌ |

### Installing and Loading
```sql
INSTALL {{ page.extension.name }} FROM community;
LOAD {{ page.extension.name }};
```

{% if page.docs.hello_world %}
### Example
```sql
{{ page.docs.hello_world }}```
{% endif %}

{% if page.docs.extended_description %}
### About {{ page.extension.name }}
{{ page.docs.extended_description }}
{% endif %}
### Added Functions

<div class="extension_functions_table"></div>

|      function_name      | function_type | description | comment | examples |
|-------------------------|---------------|-------------|---------|----------|
| proto_decode            | scalar        | NULL        | NULL    |          |
| proto_describe          | scalar        | NULL        | NULL    |          |
| proto_get               | scalar        | NULL        | NULL    |          |
| proto_schema_add        | scalar        | NULL        | NULL    |          |
| proto_schema_add_binary | scalar        | NULL        | NULL    |          |
| proto_to_json           | scalar        | NULL        | NULL    |          |

### Overloaded Functions

<div class="extension_functions_table"></div>

This extension does not add any function overloads.

### Added Types

<div class="extension_types_table"></div>

This extension does not add any types.

### Added Settings

<div class="extension_settings_table"></div>

|      name      |                       description                       | input_type | scope  | aliases | typed_value |
|----------------|---------------------------------------------------------|------------|--------|---------|-------------|
| temp_directory | Set the directory to which temporary files are written. | VARCHAR    | GLOBAL | []      | post.db.tmp |