> For a complete page index, fetch https://developer.close.com/llms.txt

# Custom Field Schemas

A Custom Field Schema presents you with *all* (regular and shared) Custom Fields that belong on a given object, in the order you've defined. It's the best endpoint to use when asking "What Custom Fields can I set on this object?"

The `object_type` in the URL can be one of: `lead`, `contact`, `opportunity`, `activity/<cat_id>`, `custom_object/<cotype_id>`.

> Returns all Custom Fields for a given object type in the order you have defined.


## API Docs

- Custom Field Schemas [Retrieve a custom field schema](https://developer.close.com/api/resources/custom-fields/custom-field-schemas/get.md)
- Custom Field Schemas [Update a custom field schema](https://developer.close.com/api/resources/custom-fields/custom-field-schemas/update.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://developer.close.com/api/resources/custom-fields/custom-field-schemas/openapi.json)
- [OpenAPI YAML](https://developer.close.com/api/resources/custom-fields/custom-field-schemas/openapi.yaml)