CASE STUDIES

Turning first-party data into personalised customer experiences

Learn how delivery and preview tokens affect published and draft content, and how to avoid unresolved links during builds.

Client

Helium CMS

Industry

Marketing Technology

Services

Contentful Preview, Next.js, Publishing Workflow

Outcome

A safer editorial preview workflow for draft content.

Preview API

Let editors preview drafts without breaking production builds

Preview content can include draft entries that the Delivery API cannot see. The app should separate preview behavior from production builds.

Use the Delivery API for production and the Preview API only when draft content should be visible.

Always check linked entries before reading sys or fields, especially in arrays managed by editors.

Before deploying, ensure every section or article linked from a published page is also published.

7 July 2026

The Author

Harold Janson