class CardService method .newCardBuilder()

CardService is the Apps Script service.

.newCardBuilder() is the method name you will see after a dot in your code.

What it does

Starts building a card UI for a Workspace add-on.

Why it's used

Start a Gmail or Calendar add-on card UI.
Workspace add-ons are built card by card.

Common errors

Forgetting parentheses on newCardBuilder. Write CardService.newCardBuilder(), not CardService.newCardBuilder or newCardBuilder by itself.
Skipping dots between chained calls. Each step needs a dot, like CardService.newCardBuilder().
Adding spaces where they do not belong. Write CardService.newCardBuilder(), not CardService .newCardBuilder(), CardService.newCardBuilder (), or CardService . newCardBuilder().
Wrong capitalization. Use CardService and newCardBuilder, not cardservice or newcardbuilder.

Official Google docs

Explore

Related methods

.newNavigation()
Defines navigation between cards in an add-on.
.newAction()
Defines what happens when a card button is clicked.
.newTextButton()
Creates a clickable text button for a card.
.newTextParagraph()
Creates a block of text for a card.

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