---
title: "Validate Combination"
method: POST
path: "/api/v1/dropdowns/validate"
tags: ["dropdowns"]
---

# Validate Combination

`POST /api/v1/dropdowns/validate`

Check whether a process/material/finishing combination is supported.

Used when the user selects manufacturing specs for a part.  The
backend checks the ``process_mappings`` table to confirm the
combination is valid before persisting the selection.

## Request body

- ValidateMaterialRequest — Request to validate a process + material + finishing combination. Used when the user selects manufacturing specs for a part. The backend checks the ``process_mappings`` table to confirm the combination is supported before persisting the selection.
  - `machining_process_id` string, uuid, required
  - `material_id` string, uuid, required
  - `finishing_id` string, uuid, nullable

## Response `200`

Successful Response

- ValidateMaterialResponse — Whether a process/material/finishing combination is valid. ``is_valid`` is ``True`` when a matching ``ProcessMapping`` row exists with ``is_valid=True``. ``message`` provides a human-readable explanation when the combination is not supported.
  - `is_valid` boolean, required
  - `message` string

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/prototyping/apis/prototyping-io-api.md) · [All operations](https://skmtc.dev/prototyping/apis/prototyping-io-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/prototyping/prototyping-io-api/revisions/f4a0079fbb57/schema)