# Upsert Request Property

> Create or update a property of a specific request.

`PUT /v1/request/{requestId}/property`

import EUAPIWarning from "/snippets/eu-api-warning.mdx";

<EUAPIWarning />

## OpenAPI

````yaml swagger.json put /v1/request/{requestId}/property
openapi: 3.0.0
info:
  title: helicone-api
  version: 1.0.0
  license:
    name: MIT
  contact: {}
servers:
  - url: https://api.helicone.ai/
  - url: http://localhost:8585/
paths:
  /v1/request/{requestId}/property:
    put:
      operationId: PutProperty
      responses:
        "200":
          description: Ok
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Result_null.string_"
      tags:
        - Request
      security:
        - api_key: []
      parameters:
        - in: path
          name: requestId
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              properties:
                value:
                  type: string
                key:
                  type: string
              required:
                - value
                - key
              type: object
components:
  schemas:
    ResultError_string_:
      properties:
        data:
          type: number
          enum:
            - null
          nullable: true
        error:
          type: string
      required:
        - data
        - error
      type: object
      additionalProperties: false
    ResultSuccess_null_:
      properties:
        data:
          type: number
          enum:
            - null
          nullable: true
        error:
          type: number
          enum:
            - null
          nullable: true
      required:
        - data
        - error
      type: object
      additionalProperties: false
    Result_null.string_:
      anyOf:
        - $ref: "#/components/schemas/ResultSuccess_null_"
        - $ref: "#/components/schemas/ResultError_string_"
````