---
title: "Update or create a constant by key (upsert)"
method: PUT
path: "/admin/constants/{key}"
tags: ["Admin Constants"]
---

# Update or create a constant by key (upsert)

`PUT /admin/constants/{key}`

## Path parameters

- `key` string, required

## Request body

- UpdateConstantDtoClass
  - `value` string, required — Constant value (stored as text)
  - `type` string — Optional type hint
  - `description` string — Optional description

## Response `200`

- ConstantItemDto
  - `id` string, required
  - `key` string, required
  - `value` string, required
  - `type` string, nullable
  - `description` string, nullable
  - `createdAt` string, date-time, required
  - `updatedAt` string, date-time, required

---

[API](https://skmtc.dev/miaai/apis/backend-template-api.md) · [All operations](https://skmtc.dev/miaai/apis/backend-template-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/miaai/backend-template-api/revisions/2a8d88a5124f/schema)