> ## Documentation Index
> Fetch the complete documentation index at: https://loops.so/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Create a contact property

> Create a custom contact property.



## OpenAPI

````yaml /openapi.json post /v1/contacts/properties
openapi: 3.1.0
info:
  title: Loops OpenAPI Spec
  description: This is the OpenAPI Spec for the [Loops API](https://loops.so/docs/api).
  version: 1.21.0
servers:
  - url: https://app.loops.so/api
security: []
tags:
  - name: API key
  - name: Audience segments
    description: View audience segments
  - name: Campaigns
    description: Create and manage email campaigns
  - name: Campaign groups
    description: Organize campaigns into groups
  - name: Components
    description: View email components
  - name: Configuration
    description: View configuration settings
  - name: Contacts
    description: Manage contacts in your audience
  - name: Contact properties
    description: Manage contact properties
  - name: Email messages
    description: Manage email message content for campaigns
  - name: Events
    description: Trigger workflows with events
  - name: Event patterns
    description: View workflow event patterns
  - name: Mailing lists
    description: View mailing lists
  - name: Themes
    description: View email themes
  - name: Transactional emails
    description: Create, manage, and send transactional emails
  - name: Transactional groups
    description: Organize transactional emails into groups
  - name: Uploads
    description: Upload image assets
  - name: Workflows
    description: View and mutate workflow graphs
  - name: Workflow nodes
    description: View and mutate workflow nodes
paths:
  /v1/contacts/properties:
    post:
      tags:
        - Contact properties
      summary: Create a contact property
      description: Create a custom contact property.
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactPropertyCreateRequest'
        required: true
      responses:
        '200':
          description: Successful create.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ContactPropertySuccessResponse'
        '400':
          description: Bad request (e.g. invalid type).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ContactPropertyFailureResponse'
        '405':
          description: Wrong HTTP request method.
      security:
        - apiKey: []
components:
  schemas:
    ContactPropertyCreateRequest:
      type: object
      required:
        - name
        - type
      description: >-
        There are a few [reserved
        names](https://loops.so/docs/contacts/properties#reserved-names) that
        you cannot use for contact properties.
      properties:
        name:
          type: string
          description: >-
            The name of the property. This should be in camelCase, like
            `planName` or `importDate`.
        type:
          type: string
          description: The type of property.
          enum:
            - string
            - number
            - boolean
            - date
    ContactPropertySuccessResponse:
      type: object
      properties:
        success:
          type: boolean
          examples:
            - true
      required:
        - success
    ContactPropertyFailureResponse:
      type: object
      properties:
        success:
          type: boolean
          examples:
            - false
        message:
          type: string
      required:
        - success
        - message
  securitySchemes:
    apiKey:
      type: http
      scheme: bearer

````

## Related topics

- [API Introduction](/docs/api-reference/intro.md)
- [Contact properties](/docs/cli/contact-properties.md)
- [Create a contact](/docs/api-reference/create-contact.md)
- [List contact properties](/docs/api-reference/list-contact-properties.md)