Mosaic DuckDB Server
A Python-based server that runs a local DuckDB instance and supports queries over HTTP, returning data in Apache Arrow format.
Note: This package provides a local DuckDB server. To instead use DuckDB-WASM in the browser, use the wasmConnector in the mosaic-core package.
Installation and usage
We recommend running the server in an isolated environment with uvx. For example, to directly run the server, use:
uvx duckdb-server
Alternatively, you can install the server with pip install duckdb-server. Then you can start the server with duckdb-server.
Developer Setup
We use uv to manage our development setup.
Start the server with uv run duckdb-server. The server will not restart when the code changes.
Start the server in development with pnpm dev. The server restarts when you change the code.
Run uv run ruff check --fix and uv run ruff format to lint the code.
To run the tests, use uv run pytest.
API
The server supports queries via HTTP GET and POST. The GET endpoint is useful for debugging.
For example, you can query it with this url:
https://localhost:3000/?query={"type":"arrow","sql":"select 1"}
Each endpoint accepts a query parameter, which is a JSON object with two required fields 1:
type
A command type, discriminates between:
arrow: Execute a single statement and return the result in Apache Arrow format.exec: Execute a one or more";"-separated statements for their side effects.
sql
SQL query to execute.
Publishing
Run the build with uv build. Then publish with uvx twine upload --skip-existing ../../dist/*. We publish using tokens so when asked, set the username to __token__ and then use your token as the password. Alternatively, create a .pypirc file.
-
Following (#1286) it is expected that the parameters may be simplified to
?type=arrow&sql=select 1↩
2 maintainers
Metadata
2 maintainers
Release files for duckdb-server 0.34.0
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| duckdb_server-0.34.0.tar.gz | 13.7 MB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| duckdb_server-0.34.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 13.7 MB
Release files / duckdb_server-0.34.0.tar.gz
| Download URL | duckdb_server-0.34.0.tar.gz |
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| Size | 13.7 MB |
| Tags | Source |
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SHA-256 checksum How to use checksums |
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| Download URL | duckdb_server-0.34.0-py3-none-any.whl |
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| Size | 14.2 kB |
| Tags | Python 3 |
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SHA-256 checksum How to use checksums |
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Yes |
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twine/7.0.0 CPython/3.13.16
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Signed by GitHub Actions, verified by PyPI on Oct 21, 2026.
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