# Trello Custom Fields API

**Canonical:** https://apis.io/apis/trello/trello-custom-fields-api/  
**Provider:** Trello — https://apis.io/providers/trello/  
**Base URL:** https://api.trello.com  
**Documentation:** https://developer.atlassian.com/cloud/trello/guides/rest-api/webhooks/

Trello Custom Fields API is one of 17 APIs that [Trello](https://apis.io/providers/trello/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Custom Fields. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

Operations for creating, retrieving, updating, and deleting custom field definitions and their values on boards and cards.

## Operations (6)

| Method | Path | Summary |
|---|---|---|
| POST | `/customFields` | Create a Custom Field Definition |
| GET | `/customFields/{id}` | Get a Custom Field Definition |
| PUT | `/customFields/{id}` | Update a Custom Field Definition |
| DELETE | `/customFields/{id}` | Delete a Custom Field Definition |
| GET | `/cards/{id}/customFieldItems` | Get Custom Field Items on a Card |
| PUT | `/cards/{idCard}/customField/{idCustomField}/item` | Set a Custom Field Value on a Card |

## Machine-readable artifacts (3)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/trello/refs/heads/main/openapi/trello-custom-fields-api-openapi.yml
- **Documentation** — https://developer.atlassian.com/cloud/trello/rest/
- **GraphQL** — https://raw.githubusercontent.com/api-evangelist/trello/refs/heads/main/graphql/trello-graphql.md

## Other Trello APIs (12)

- [Trello Webhooks API](https://apis.io/apis/trello/webhooks-api/)
- [Trello Power-Ups](https://apis.io/apis/trello/power-ups/)
- [trello Actions API](https://apis.io/apis/trello/trello-actions-api/)
- [trello Boards API](https://apis.io/apis/trello/trello-boards-api/)
- [trello Cards API](https://apis.io/apis/trello/trello-cards-api/)
- [trello Checklists API](https://apis.io/apis/trello/trello-checklists-api/)
- [trello Labels API](https://apis.io/apis/trello/trello-labels-api/)
- [trello Lists API](https://apis.io/apis/trello/trello-lists-api/)
- [trello Members API](https://apis.io/apis/trello/trello-members-api/)
- [trello Notifications API](https://apis.io/apis/trello/trello-notifications-api/)
- [trello Organizations API](https://apis.io/apis/trello/trello-organizations-api/)
- [trello Plugins API](https://apis.io/apis/trello/trello-plugins-api/)

## Tags

Custom Fields

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/trello/trello-custom-fields-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/trello/.