---
title: "Changes to Add an existing Custom Field to a Product."
method: POST
path: "/products/{id}/fields.json"
---

# Changes to Add an existing Custom Field to a Product.

`POST /products/{id}/fields.json`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 3 of 12 revisions.

- **2026-10-15** `53dc9f2c1329`: 9 breaking, 2 warning, 14 info
- **2026-09-28** `6d9bc2d4601a`: 2 info
- **2026-09-03** `b6c544795149`: 1 info

## Changes

- **2026-10-15** `53dc9f2c1329`: 9 breaking, 2 warning, 14 info
  - the request property `field/id` became required
  - the request property `field/value` became required
  - the response property `product/categories/items/parent_id` became nullable for the status `200`
  - the response property `product/compare_at_price` became nullable for the status `200`
  - the response property `product/cost_per_item` became nullable for the status `200`
  - the response property `product/days_to_expire` became nullable for the status `200`
  - the response property `product/variants/items/compare_at_price` became nullable for the status `200`
  - the response property `product/variants/items/cost_per_item` became nullable for the status `200`
  - the response property `product/variants/items/options/items/custom` became nullable for the status `200`
  - removed the optional property `product/categories/items/permalink` from the response with the `200` status
  - removed the optional property `product/digital_products` from the response with the `200` status
  - added the new optional `query` request parameter `fields`
  - added the optional property `product/appointment_location_id` to the response with the `200` status
  - added the optional property `product/appointment_settings` to the response with the `200` status
  - added the optional property `product/categories/items/description` to the response with the `200` status
  - added the optional property `product/currency` to the response with the `200` status
  - added the optional property `product/fields` to the response with the `200` status
  - added the optional property `product/google_product_category` to the response with the `200` status
  - added the optional property `product/meta_description` to the response with the `200` status
  - added the optional property `product/shipping_required` to the response with the `200` status
  - added the optional property `product/variants/items/discount` to the response with the `200` status
  - added the optional property `product/variants/items/options/items/product_option_id` to the response with the `200` status
  - added the optional property `product/variants/items/options/items/product_option_value_id` to the response with the `200` status
  - added the optional property `product/variants/items/position` to the response with the `200` status
  - added the optional property `product/variants/items/weight` to the response with the `200` status
- **2026-09-28** `6d9bc2d4601a`: 2 info
  - added the optional property `product/variants/items/created_at` to the response with the `200` status
  - added the optional property `product/variants/items/updated_at` to the response with the `200` status
- **2026-09-03** `b6c544795149`: 1 info
  - added the optional property `product/bundle_components` to the response with the `200` status

---

[Operation](https://skmtc.dev/jumpseller/apis/jumpseller-api/docs/products/:id/fields.json/post.md) - [API](https://skmtc.dev/jumpseller/apis/jumpseller-api.md) - [Page](https://skmtc.dev/jumpseller/apis/jumpseller-api/changes/products/:id/fields.json/post)