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Rich Display Rendering

Windmill processes some outputs (from scripts or flows) intelligently to provide rich display rendering, allowing you to customize the display format of your results.

By default, all results are displayed in a JSON format. However, some formats are recognised automatically (Rich Table Display), while others can be forced through your code. By leveraging specific keys, you can display images, files, tables, HTML, JSON, and more.

If the result is an object/dict with a single key (except for resume, which needs 3), you can leverage the following rich results:

TypeDescriptionExample
table-colRender the value as a column-wise table.return { "table-col": { "foo": [42, 8], "bar": [38, 12] } }
table-rowRender the value as a row-wise table.return { "table-row": [ [ "foo", "bar" ], [ 42, 38 ], [ 8, 12 ] ] }
table-row-objectRender the value as a row-wise table but where each row is an object.return { "table-row-object": [ { "foo": 42, "bar": 38 }, { "foo": 8, "bar": 12 } ] } or return { "table-row-object": [ ["foo", "bar" ], { "foo": 42, "bar": 38 }, { "foo": 8, "bar": 12 } ] }
s3Render S3 files as a downloadable file and a bucket explorer, when Windmill is connected to a S3 storage.return { "s3": "path_to_file"}
htmlRender the value as HTML.return { "html": "<div>...</div>" }
markdownRender the value as Markdown.return { "markdown": "## Hello World\nNice to meet you" } or return { "md": "## Hello World\nNice to meet you" }
fileRender an option to download a file.return { "file": { "content": encode(file), "filename": "data.txt" } }
pngRender the value as a PNG image.return { "png": { "content": base64Image } } or return { "png": base64Image }
jpegRender the value as a JPEG image.return { "jpeg": { "content": base64Image } } or return { "jpeg": base64Image }
gifRender the value as a GIF image.return { "gif": { "content": base64Image } } or return { "gif": base64Image }
svgRender the value as an SVG image.return { "svg": "<svg>...</svg>" }
errorRender the value as an error message.return { "error": { "name": "418", "message": "I'm a teapot" }}
resumeRender an approval and buttons to Resume or Cancel the step.return { "resume": "https://example.com", "cancel": "https://example.com", "approvalPage": "https://example.com" }
mapRender a map with a given location.return { "map": { lat: 40, lon: 0, zoom: 3, markers: [{lat: 50.6, lon: 3.1, title: "Home", radius: 5, color: "yellow", strokeWidth: 3, strokeColor: "Black"}]}}
render_allRender all the results.return { "render_all": [ { "json": { "a": 1 } }, { "table-col": { "foo": [42, 8], "bar": [38, 12] }} ] }

Tables​

There are various ways to display results as tables within Windmill. Rich Table Display automatically renders results as an interactive table, or you can force a table view with specific keys.

If the result matches the table format (either table-col, table-row, or table-row-object), it will be automatically detected and displayed as a table even if the data is not nested under the key table-*.

There are 3 table shapes that are supported:

Rich Table Display​

The rich table display does not require a specific key and will be enabled for scripts or flows when the result is an array of objects.

You can also force table display with a key (table-col, table-row, table-row-object).

Default

Example​

Try with this Python:

from typing import List, Dict

def main() -> List[Dict[str, str]]:

    pokemon_data = [
        {"Pokemon name": "Pikachu", "Type": "Electric", "Main strength": "Speed"},
        {"Pokemon name": "Charizard", "Type": "Fire/Flying", "Main strength": "Attack"},
        {"Pokemon name": "Bulbasaur", "Type": "Grass/Poison", "Main strength": "Defense"},
        {"Pokemon name": "Squirtle", "Type": "Water", "Main strength": "Defense"},
        {"Pokemon name": "Jigglypuff", "Type": "Normal/Fairy", "Main strength": "HP"},
    ]

    return pokemon_data

Rich Table Display

As you can see, the columns are not properly ordered. You can force column order with Table Row Object.

For example, with columns ordered:

from typing import List, Dict

def main() -> List[Dict[str, str]]:

    pokemon_data = [
        ["Pokemon name", "Type", "Main strength"],

        {"Pokemon name": "Pikachu", "Type": "Electric", "Main strength": "Speed"},
        {"Pokemon name": "Charizard", "Type": "Fire/Flying", "Main strength": "Attack"},
        {"Pokemon name": "Bulbasaur", "Type": "Grass/Poison", "Main strength": "Defense"},
        {"Pokemon name": "Squirtle", "Type": "Water", "Main strength": "Defense"},
        {"Pokemon name": "Jigglypuff", "Type": "Normal/Fairy", "Main strength": "HP"},
    ]

    return pokemon_data

Rich Table Display Ordered

Table Column​

The table-col key allows returning the value as a column-wise table.

If the result matches the table format, it will be displayed as a table even if the data is not nested under the key table-col.

return { "foo": [42, 8], "bar": [38, 12] }

or

return { "table-col": { "foo": [42, 8], "bar": [38, 12] } }

Rich display Table Column

Table Row​

The table-row key allows returning the value as a row-wise table.

If the result matches the table format, it will be displayed as a table even if the data is not nested under the key table-row.

return { [ [ "foo", "bar" ], [ 42, 38 ], [ 8, 12 ] ] }

or

return { "table-row": [ [ "foo", "bar" ], [ 42, 38 ], [ 8, 12 ] ] }

Rich display Table Row

Table Row Object​

The table-row-object key allows returning the value as a row-wise table but where each row is an object (optionally the first row can be an array of strings to enforce column order).

If the result matches the table format, it will be displayed as a table even if the data is not nested under the key table-row-object.

List of columns is not mandatory but it allows forcing their order.

return [ { "foo": 42, "bar": 38 }, { "foo": 8, "bar": 12 } ]

Rich display Table Row Object 1

or

return [ ["foo", "bar" ], { "foo": 42, "bar": 38 }, { "foo": 8, "bar": 12 } ]

Rich display Table Row Object 2

S3​

The s3 key renders S3 files as a downloadable file and a bucket explorer, when Windmill is connected to a S3 storage.

return { "s3": "path/to/file" }

When a script outputs a S3 file, it can be downloaded or previewed directly in Windmill's UI (for displayable files like text files, CSVs or parquet files).

S3 file download

Even though the whole file is downloadable, the backend only sends the rows that the frontend needs for the preview. This means that you can manipulate objects of infinite size, and the backend will only return what is necessary.

You can even display several S3 files through an array of S3 objects:

export async function main() {
  return [{s3: "path/to/file_1"}, {s3: "path/to/file_2", {s3: "path/to/file_3"}}];
}

S3 list of files download

Learn more at:

Object Storage for Large Data: S3, R2, MinIO, Azure Blob
Windmill comes with a native integration with S3 and Azure Blob, making it the recommended storage for large objects like files and binary data.

HTML​

The html key allows returning the value as HTML.

return { "html": "<div>...</div>" }

Rich display HTML

Markdown​

The markdown key allows returning the value as Markdown.

return { "markdown": "## Hello World\nNice to meet you" }

or

return { "md": "## Hello World\nNice to meet you" }

Rich display Markdown

File​

The file key allows returning an option to download a file.

return { "file": { "content": encode(file), "filename": "data.txt" } }

Rich display File

PNG​

The png key allows returning the value as a PNG image.

The picture must be encoded in base64.

return { "png": { "content": base64Image } }

or

return { "png": base64Image }

Rich display PNG

JPEG​

The jpeg key allows returning the value as a JPEG image.

The picture must be encoded in base64.

return { "jpeg": { "content": base64Image } }

or

return { "jpeg": base64Image }

Rich display JPEG

GIF​

The gif key allows returning the value as a GIF.

The gif must be encoded in base64.

return { "gif": { "content": base64Image } }

or

return { "gif": base64Image }

SVG​

The svg key allows returning the value as an SVG image.

return { "svg": "<svg>...</svg>" }

Rich display SVG

Error​

The error key allows returning the value as an error message.

return { "error": { "name": "418", "message": "I'm a teapot" }}

Rich display Error

Resume​

The resume key allows returning an approval and buttons to Resume or Cancel the step.

return { "resume": "https://example.com", "cancel": "https://example.com", "approvalPage": "https://example.com" }

Rich display Resume

Map​

The map key allows returning a map with a given location.

return { "map": { lat: 40, lon: 0, zoom: 3, markers: [{lat: 50.6, lon: 3.1, title: "Home", radius: 5, color: "yellow", strokeWidth: 3, strokeColor: "Black"}]}}

Rich display map

Render All​

The render_all key allows returning all results with their specific format.

return { "render_all": [ { "json": { "a": 1 } }, { "table-col": { "foo": [42, 8], "bar": [38, 12] }} ] }

Rich display Render All