Waymark / Routes / developers.hubspot.com Batch upsert HubSpot contacts using the v3 Contacts API
domain: developers.hubspot.com · 5 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps POST to /crm/v3/objects/contacts/batch/upsert with a JSON body containing an inputs array Each input object must have an idProperty field (the property name to match on, e.g., email) and a properties map of fields to set Include an id field if upserting by the internal HubSpot record ID, or omit id and use idProperty with a unique property value Check the results array in the response; each item has a status of CREATED or UPDATED and the resulting record Handle RATE_LIMIT errors with exponential backoff and retry — the batch endpoint shares the same rate limits as individual calls Known gotchas A single batch upsert request supports up to 100 inputs — split larger sets into multiple requests The idProperty used for matching must be a unique property in HubSpot; using a non-unique property causes unpredictable matching Property names in the payload must use the HubSpot internal API name (snake_case), not the display label
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