Retrieve Rentman's Extra Input Fields (custom field) definitions via the API
domain: api.rentman.net · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Authenticate with a Rentman API token as you would for any other Rentman API call.
Call GET /extrainputfields to list all custom field definitions configured in the account.
Call GET /extrainputfields/{id} to read a single custom field's configuration in detail.
Cross-reference the itemtype/item values on records like /files or /folders (which also expose custom-field-adjacent metadata) to see which entities a given extra input field applies to.
Cache the field ID-to-name mapping locally since Extra Input Fields are configuration data, not high-churn transactional data.
Known gotchas
Extra Input Fields only became readable via the API in version 1.12.0 (26 May 2026) — this is a recent addition, not part of Rentman's original public API surface.
This endpoint is read-only (GET only) as documented; there is no documented write endpoint for creating or updating custom field definitions through the public API.
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