An open source multi-tool for exploring and publishing data https://datasette.io
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Alex Garcia 71d382bbd4 Capstone review fixes: per-test reset, rename, provider guard, UpDownCounter, naming rules, privacy walk
Outcome of a whole-stack review with the kit visible as one system:

- otel_reset: an autouse fixture draining the span exporter and metric
  reader after every test. Without it a large suite accumulates hundreds
  of thousands of recorded spans in the session-scoped exporter - the
  likeliest amplifier of the slow-runner CI flakes - and plugins would
  inherit the same leak.
- assert_registry_covered renamed to assert_spans_covered: the old name
  read as covering the whole registry, which is exactly wrong next to
  assert_metrics_covered. Public API is forever; renamed before anything
  ships, no alias.
- The installers now verify their provider actually took: with a
  provider installed first (opentelemetry-instrument, an embedding app),
  set_*_provider() is silently ignored, and fixtures would assert
  against an exporter wired to nothing. They skip clearly instead.
- UPDOWN_COUNTER registry kind, mapped to Sum with monotonicity checked
  both ways - a Counter must collect monotonic, an UpDownCounter must
  not. Previously an UpDownCounter's kind check was silently skipped.
- The docs page now prescribes naming: scope = import package name
  (underscores), signal prefix = a name you own, never bare datasette.*;
  its own examples no longer teach the hyphenated outlier. Plus an
  observable-gauges pattern section and a prefix-overlap note.
- assert_no_forbidden_values(): the enforcement half of the privacy
  rules - plant sentinel secrets in a workload and assert they never
  appear in any span name, attribute, event, status description or
  metric attribute, across all scopes by default.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012U7coQfVu8nK2R4q2mCULA
2026-09-02 14:26:45 -07:00
.github check-latest: true, add 3.15 to test matrix, to test RCs (#2895) 2026-09-01 13:37:15 -07:00
datasette Capstone review fixes: per-test reset, rename, provider guard, UpDownCounter, naming rules, privacy walk 2026-09-02 14:26:45 -07:00
demos Fixed an unnecessary f-string 2024-02-04 10:15:21 -08:00
docs Capstone review fixes: per-test reset, rename, provider guard, UpDownCounter, naming rules, privacy walk 2026-09-02 14:26:45 -07:00
tests Capstone review fixes: per-test reset, rename, provider guard, UpDownCounter, naming rules, privacy walk 2026-09-02 14:26:45 -07:00
.coveragerc Configure code coverage, refs #841, #843 2020-06-13 13:48:23 -07:00
.dockerignore Build Dockerfile with SpatiaLite 5, refs #1249 2021-03-26 21:27:40 -07:00
.git-blame-ignore-revs Ignore Black commits in git blame, refs #1716 2022-04-22 14:58:46 -07:00
.gitattributes New explicit versioning mechanism 2020-10-28 20:38:15 -07:00
.gitignore Ignore ignored/ directory 2026-06-25 21:20:29 -07:00
.isort.cfg Used isort to re-order my imports 2018-05-14 00:04:23 -03:00
.prettierrc .prettierrc, refs #1166 2020-12-31 13:25:44 -08:00
.readthedocs.yaml dependency-groups and uv (#2611) 2025-12-11 17:32:58 -08:00
CODE_OF_CONDUCT.md Add code of conduct again 2022-03-15 08:38:42 -07:00
codecov.yml codecov should not be blocking 2020-07-02 21:29:32 -07:00
Dockerfile Upgrade Docker images to Python 3.11, closes #1853 2022-10-25 12:04:53 -07:00
Justfile Add Prettier check to lint recipe (#2821) 2026-07-03 09:50:35 -07:00
LICENSE Initial commit 2017-10-22 17:39:03 -07:00
MANIFEST.in Include LICENSE in sdist (#1043) 2020-10-23 13:54:34 -07:00
package-lock.json Bump rollup from 3.29.5 to 3.30.0 (#2651) 2026-03-30 10:54:48 -07:00
package.json Bump rollup from 3.29.5 to 3.30.0 (#2651) 2026-03-30 10:54:48 -07:00
pyproject.toml Add opentelemetry-api dependency and datasette/telemetry.py scaffolding 2026-09-01 16:24:15 -07:00
pytest.ini Initial Playwright setup plus first test 2026-06-14 16:39:55 -07:00
README.md Replace Glitch with Codespaces, closes #2488 2025-05-28 19:17:22 -07:00
ruff.toml Upgrade to ruff>=0.16.0 (#2857) 2026-07-25 15:47:08 -07:00
setup.cfg Switch to ruff and fix all lint errors, refs #2630 2026-01-23 20:43:16 -08:00
test-in-pyodide-with-shot-scraper.sh Test against pyodide/v314.0.0 2026-06-22 10:11:56 -07:00

Datasette

PyPI Changelog Python 3.x Tests Documentation Status License docker: datasette discord

An open source multi-tool for exploring and publishing data

Datasette is a tool for exploring and publishing data. It helps people take data of any shape or size and publish that as an interactive, explorable website and accompanying API.

Datasette is aimed at data journalists, museum curators, archivists, local governments, scientists, researchers and anyone else who has data that they wish to share with the world.

Explore a demo, watch a video about the project or try it out on GitHub Codespaces.

Want to stay up-to-date with the project? Subscribe to the Datasette newsletter for tips, tricks and news on what's new in the Datasette ecosystem.

Installation

If you are on a Mac, Homebrew is the easiest way to install Datasette:

brew install datasette

You can also install it using pip or pipx:

pip install datasette

Datasette requires Python 3.8 or higher. We also have detailed installation instructions covering other options such as Docker.

Basic usage

datasette serve path/to/database.db

This will start a web server on port 8001 - visit http://localhost:8001/ to access the web interface.

serve is the default subcommand, you can omit it if you like.

Use Chrome on OS X? You can run datasette against your browser history like so:

 datasette ~/Library/Application\ Support/Google/Chrome/Default/History --nolock

Now visiting http://localhost:8001/History/downloads will show you a web interface to browse your downloads data:

Downloads table rendered by datasette

metadata.json

If you want to include licensing and source information in the generated datasette website you can do so using a JSON file that looks something like this:

{
    "title": "Five Thirty Eight",
    "license": "CC Attribution 4.0 License",
    "license_url": "http://creativecommons.org/licenses/by/4.0/",
    "source": "fivethirtyeight/data on GitHub",
    "source_url": "https://github.com/fivethirtyeight/data"
}

Save this in metadata.json and run Datasette like so:

datasette serve fivethirtyeight.db -m metadata.json

The license and source information will be displayed on the index page and in the footer. They will also be included in the JSON produced by the API.

datasette publish

If you have Heroku or Google Cloud Run configured, Datasette can deploy one or more SQLite databases to the internet with a single command:

datasette publish heroku database.db

Or:

datasette publish cloudrun database.db

This will create a docker image containing both the datasette application and the specified SQLite database files. It will then deploy that image to Heroku or Cloud Run and give you a URL to access the resulting website and API.

See Publishing data in the documentation for more details.

Datasette Lite

Datasette Lite is Datasette packaged using WebAssembly so that it runs entirely in your browser, no Python web application server required. Read more about that in the Datasette Lite documentation.