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A campaign read returns 7 default properties plus `assets` unless `properties` names the ones wanted. With `properties`, the default system properties are dropped and unset properties are absent, not null.

Measured

Checked

Checked October 21, 2026 on a HubSpot developer test account

Area

Tags

campaigns, read, properties, diff

More facts from this area

Attaching an asset to a campaign is PUT /marketing/v3/campaigns/{campaignGuid}/assets/{assetType}/{assetId}, which answers 204. Measured for FORM and MARKETING_EMAIL.Measured
WORKFLOW and CASE are not campaign asset types (both return 400); the valid names are AUTOMATION_PLATFORM_FLOW and CASE_STUDY. The 400 for an invalid type lists the valid set.Measured
The Campaigns API needs Marketing Hub Professional or higher.Source pending

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