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flat

A quick reference for the Notion flat function, including syntax, purpose, return value, and examples.

Quick reference

ItemDetails
Functionflat()
CategoryLists
Syntaxflat(list)
PurposeFlatten nested lists
Return valueList

Official example of the flat function in the Notion formula editor

Examples and notes

When map() returns a list of lists, use flat() to flatten it.

prop("Project").map(current.prop("Tasks")).flat()

This is common in multi-level relations such as "Project -> Task -> Subtask".

To use these formulas directly in task reminders, project progress, note heatmaps, and reports, continue with FLO.W Notion Template.

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