Proper Case All Text Columns in Power Query M

Capitalizes the first letter of each word across every text column in a table at once.

Data CleaningIntermediateproper caseall columnstextbulk

Power Query M code

let
    Source = YourTable,
    TextColumns = List.Select(Table.ColumnNames(Source), each Type.Is(Value.Type(Table.Column(Source, _)), type text)),
    ProperCased = Table.TransformColumns(Source, List.Transform(TextColumns, each {_, Text.Proper, type text}))
in
    ProperCased

Notes

Skip this on columns like codes or IDs where mixed case is intentional.

Requirements

How to use this snippet

  1. In Power BI Desktop, choose Transform data to open Power Query, then open the Advanced Editor on a query (or start from a blank query).
  2. Paste the snippet and replace the placeholder names (tables, columns, file paths) with your own. Check the requirements above first.
  3. Run it through the Power Query M Formatter to tidy the layout.

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