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Xarray accessors for publishing datasets as web applications

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Publish Xarray Datasets via a Zarr compatible REST API

Server side: Publish a xarray dataset as a rest API"", port=9000)

Client side: Connect to a published dataset

import xarray as xr
import zarr
from fsspec.implementations.http import HTTPFileSystem

fs = HTTPFileSystem()
http_map = fs.get_mapper('')

# open as a zarr group
zg = zarr.open_consolidated(http_map, mode='r')

# open as another xarray dataset
xr.open_zarr(http_map, consolidated=True)


xpublish lets you serve/share/publish xarray datasets via a web application. The data in the xarray datasets (on the server side) can be backed by dask to facilitate on-demand computation via a simple REST API. We are exploring applications of xpublish that include:

  • publish on-demand derived data products
  • turning xarray objects into streaming services (e.g. OPENDAP)


Under the hood, xpublish is using a web app (FastAPI) that is exposing a minimal Zarr compatible REST-like API. Key attributes of the API are:

  • serves a Zarr store API from the root of the dataset
  • provides Zarr metadata keys (.zmetadata) as json strings.
  • provides access to data keys (e.g. var/0.0.0) as binary strings.

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