datasette-dashboards by rclement

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Datasette plugin providing data dashboards from metadata

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Try out a live demo at

WARNING: this plugin is still experimental and not ready for production. Some breaking changes might happen between releases before reaching a stable version. Use it at your own risks!

Datasette Dashboards Demo


Install this plugin in the same environment as Datasette:

$ datasette install datasette-dashboards


Define dashboards within metadata.yml / metadata.json:

      title: My Dashboard
      description: Showing some nice metrics
        - [analysis-note, events-count]
        - [analysis-note, events-source]
          name: Date Start
          type: date
          default: "2021-01-01"
          name: Date End
          type: date
          library: markdown
          display: |-
            # Analysis notes
            > A quick rundown of events statistics and KPIs

          title: Total number of events
          db: jobs
          query: SELECT count(*) as count FROM events
          library: metric
            field: count

          title: Number of events by source
          db: jobs
          query: SELECT source, count(*) as count FROM events WHERE TRUE [[ AND date >= date(:date_start) ]] [[ AND date <= date(:date_end) ]] GROUP BY source ORDER BY count DESC
          library: vega
            mark: { type: bar, tooltip: true }
              color: { field: source, type: nominal }
              theta: { field: count, type: quantitative }

A new menu entry is now available, pointing at /-/dashboards to access all defined dashboards.


Dashboard properties:

Property Type Description
title string Dashboard title
description string Dashboard description
layout array Dashboard layout
filters object Dashboard filters

Dashboard filters:

Property Type Description
name string Filter display name
type string Filter type (text, date, number)
default string, number (optional) Filter default value
min number (optional) Filter minimum value
max number (optional) Filter maximum value
step number (optional) Filter stepping value

Common chart properties for all chart types:

Property Type Description
title string Chart title
db string Database name against which to run the query
query string SQL query to run and extract data from
library string One of supported libraries: vega, markdown, metric
display object Chart display specification (depend on the used library)

To define SQL queries using dashboard filters:

SELECT * FROM mytable [[ WHERE col >= :my_filter ]]
SELECT * FROM mytable WHERE TRUE [[ AND col1 = :my_filter_1 ]] [[ AND col2 = :my_filter_2 ]]

Vega properties

Available configuration for vega charts:

Property Type Description
library string Must be set to vega
display object Vega specification object

Notes about the display property:

  • Requires a valid Vega specification object
  • Some fields are pre-defined: $schema, title, width, view, config, data
  • All fields are passed along as-is (overriding pre-defined fields if any)
  • Only mark and encoding fields are required as the bare-minimum

Markdown properties

Available configuration for markdown chart:

Property Type Description
library string Must be set to markdown
display string Multi-line string containing the Markdown content

Note :

  • Some common properties do not apply and can be omitted: title, db, query
  • Markdown rendering is done by datasette-render-markdown
  • To configure Markdown rendering, extensions can be enabled in metadata

Metric properties

Available configuration for metric chart:

Property Type Description
library string Must be set to metric
display.field string Numerical field to be displayed as metric
display.prefix string Prefix to be displayed before metric
display.suffix string Prefix to be displayed after metric


  • The display.field must reference a single-numerical value from the SQL query (e.g. numerical number field in SELECT count(*) as number FROM events)

Dashboard layout

The default dashboard layout will present two charts per row (one per row on mobile). To make use of custom dashboard layout using CSS Grid Layout, define the layout array property as a grid / matrix:

  • Each entry represents a row of charts
  • Each column is referring a chart by its property name


To set up this plugin locally, first checkout the code. Then create a new virtual environment and the required dependencies:

pipenv install -d
pipenv shell

To run the tests:



With the developmnent environment setup, you can run the demo locally:

datasette --metadata demo/metadata.yml demo/jobs.db


Licensed under Apache License, Version 2.0

Copyright (c) 2021 - present Romain Clement