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

# List Catalog Categories

> GET /public/catalog/categories — Returns the full catalog category hierarchy grouped by industry, including sub-categories and image URLs where available.

Retrieves the complete category tree from the Portal.io catalog. The response is an array of top-level industry objects, each containing a nested `categories` array with their child categories and optional image URLs. Sub-categories may themselves contain additional `subCategories` arrays. Use the `id` values from this response as `CategoryId` or `ParentCategoryId` filters when searching catalog items.

<Warning>
  The Catalog endpoints require separate authorization. Contact your Portal.io representative to confirm your account has catalog API access enabled.
</Warning>

<RequestExample>
  ```bash curl theme={null}
  curl -i -X GET \
    'https://api.portal.io/public/catalog/categories' \
    -H 'Accept: application/json' \
    -H 'X-MSS-API-APPID: YOUR_APP_ID' \
    -H 'X-MSS-API-USERKEY: YOUR_USER_KEY' \
    -H 'X-MSS-CUSTOM-DATE: Mon, 06 Apr 2026 00:22:19 GMT' \
    -H 'X-MSS-SIGNATURE: BASE64_SIGNATURE'
  ```

  ```python python theme={null}
  import requests
  from portal_auth import sign_request  # See authentication guide

  url = "https://api.portal.io/public/catalog/categories"
  timestamp = "Mon, 06 Apr 2026 00:22:19 GMT"
  signature = sign_request("GET", url, "", timestamp, "YOUR_USER_KEY", "YOUR_SECRET_KEY")

  response = requests.get(url, headers={
      "Accept": "application/json",
      "X-MSS-API-APPID": "YOUR_APP_ID",
      "X-MSS-API-USERKEY": "YOUR_USER_KEY",
      "X-MSS-CUSTOM-DATE": timestamp,
      "X-MSS-SIGNATURE": signature
  })
  print(response.json())
  ```

  ```javascript node.js theme={null}
  const { signRequest } = require('./portalAuth'); // See authentication guide

  const url = "https://api.portal.io/public/catalog/categories";
  const timestamp = new Date().toUTCString();
  const signature = signRequest("GET", url, "", timestamp, "YOUR_USER_KEY", "YOUR_SECRET_KEY");

  const response = await fetch(url, {
      headers: {
          "Accept": "application/json",
          "X-MSS-API-APPID": "YOUR_APP_ID",
          "X-MSS-API-USERKEY": "YOUR_USER_KEY",
          "X-MSS-CUSTOM-DATE": timestamp,
          "X-MSS-SIGNATURE": signature
      }
  });
  const data = await response.json();
  console.log(data);
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  [
    {
      "id": 12,
      "name": "Audio",
      "categories": [
        {
          "id": 47,
          "name": "AV Receivers",
          "imageUrl": "https://images.portal.io/categories/47.jpg",
          "subCategories": []
        },
        {
          "id": 48,
          "name": "Amplifiers",
          "imageUrl": null,
          "subCategories": []
        }
      ]
    },
    {
      "id": 13,
      "name": "Video",
      "categories": [
        {
          "id": 60,
          "name": "Displays",
          "imageUrl": "https://images.portal.io/categories/60.jpg",
          "subCategories": [
            {
              "id": 61,
              "name": "4K Displays",
              "imageUrl": null,
              "subCategories": []
            }
          ]
        }
      ]
    }
  ]
  ```
</ResponseExample>


## OpenAPI

````yaml GET /public/catalog/categories
openapi: 3.1.0
info:
  title: Portal.Api
  version: '1.0'
servers:
  - url: http://127.0.0.1:5000
security: []
tags: []
paths:
  /public/catalog/categories:
    get:
      tags:
        - Catalog
      summary: Category List
      description: >-
        Returns the catalog category hierarchy grouped by industry, including
        category image URLs when available.
      operationId: GetCategoryList
      parameters:
        - $ref: '#/components/parameters/Accept'
        - name: X-MSS-API-APPID
          in: header
          description: Application Id
          required: true
          schema:
            type: string
        - name: X-MSS-CUSTOM-DATE
          in: header
          description: A date timestamp of the request
          required: true
          schema:
            type: string
        - name: X-MSS-SIGNATURE
          in: header
          description: A signature for the request
          required: true
          schema:
            type: string
        - name: X-MSS-API-USERKEY
          in: header
          description: User API Key
          required: true
          schema:
            type: string
      responses:
        '200':
          description: A catalog response
          content:
            application/json:
              schema:
                title: List<PublicIndustryItem>
                type: array
                items:
                  $ref: '#/components/schemas/PublicIndustryItem'
        '401':
          description: >-
            Not Authorized to access this endpoint or your HMAC hash was
            incorrect.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WebServiceException'
        '402':
          description: This action requires an active subscription.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HttpError'
        '403':
          description: You do not have permission for this API call.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HttpError'
        '500':
          description: Internal error.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WebServiceException'
      deprecated: false
      x-codeSamples: []
components:
  parameters:
    Accept:
      name: Accept
      in: header
      description: Accept Header
      required: true
      schema:
        type: string
        enum:
          - application/json
  schemas:
    PublicIndustryItem:
      title: PublicIndustryItem
      required:
        - id
        - name
      properties:
        id:
          description: Unique numeric identifier of the industry
          type: integer
          format: int32
        name:
          description: Industry display name
          type: string
        categories:
          description: Categories returned for the industry
          type: array
          items:
            $ref: '#/components/schemas/PublicCategoryItemResponse'
      description: Industry grouping returned by the public category tree
      type: object
    WebServiceException:
      title: WebServiceException
      properties:
        statusCode:
          type: integer
          format: int32
        statusDescription:
          type: string
        responseHeaders:
          $ref: '#/components/schemas/WebHeaderCollection'
        responseDto:
          $ref: '#/components/schemas/Object'
        responseBody:
          type: string
        message:
          type: string
        errorCode:
          type: string
        errorMessage:
          type: string
        serverStackTrace:
          type: string
        state:
          $ref: '#/components/schemas/Object'
        responseStatus:
          $ref: '#/components/schemas/ResponseStatus'
        targetSite:
          $ref: '#/components/schemas/MethodBase'
        data:
          $ref: '#/components/schemas/IDictionary'
        innerException:
          $ref: '#/components/schemas/Exception'
        helpLink:
          type: string
        source:
          type: string
        hResult:
          type: integer
          format: int32
        stackTrace:
          type: string
      description: WebServiceException
      type: object
    HttpError:
      title: HttpError
      properties:
        errorCode:
          type: string
        stackTrace:
          type: string
        contentType:
          type: string
        headers:
          $ref: '#/components/schemas/Dictionary_String_String_'
        cookies:
          type: array
          items:
            $ref: '#/components/schemas/Cookie'
        status:
          type: integer
          format: int32
        statusCode:
          type: string
        statusDescription:
          type: string
        response:
          $ref: '#/components/schemas/Object'
        responseFilter:
          $ref: '#/components/schemas/IContentTypeWriter'
        requestContext:
          $ref: '#/components/schemas/IRequest'
        paddingLength:
          type: integer
          format: int32
        resultScope:
          $ref: '#/components/schemas/Func_IDisposable_'
        options:
          $ref: '#/components/schemas/IDictionary_String_String_'
        responseStatus:
          $ref: '#/components/schemas/ResponseStatus'
        targetSite:
          $ref: '#/components/schemas/MethodBase'
        message:
          type: string
        data:
          $ref: '#/components/schemas/IDictionary'
        innerException:
          $ref: '#/components/schemas/Exception'
        helpLink:
          type: string
        source:
          type: string
        hResult:
          type: integer
          format: int32
      description: HttpError
      type: object
    PublicCategoryItemResponse:
      title: PublicCategoryItemResponse
      required:
        - id
        - name
      properties:
        id:
          description: Unique numeric identifier of the category
          type: integer
          format: int32
        name:
          description: Category display name
          type: string
        imageUrl:
          description: Category image URL when available
          type: string
        subCategories:
          description: Child categories nested under this category
          type: array
          items:
            $ref: '#/components/schemas/PublicCategoryItemResponse'
      description: Category node returned by the public category tree
      type: object
    WebHeaderCollection:
      title: WebHeaderCollection
      properties: {}
      description: WebHeaderCollection
      type: object
    Object:
      properties: {}
      description: Object
      type: object
    ResponseStatus:
      title: ResponseStatus
      properties:
        errorCode:
          type: string
        message:
          type: string
        stackTrace:
          type: string
        errors:
          type: array
          items:
            $ref: '#/components/schemas/ResponseError'
        meta:
          $ref: '#/components/schemas/Dictionary_String_String_'
      description: ResponseStatus
      type: object
    MethodBase:
      title: MethodBase
      properties: {}
      description: MethodBase
      type: object
    IDictionary:
      title: IDictionary
      properties: {}
      description: IDictionary
      type: object
    Exception:
      title: Exception
      properties: {}
      description: Exception
      type: object
    Dictionary_String_String_:
      title: Dictionary<String,String>
      additionalProperties:
        type: string
      description: Dictionary<String,String>
      type: object
    Cookie:
      title: Cookie
      properties: {}
      description: Cookie
      type: object
    IContentTypeWriter:
      title: IContentTypeWriter
      properties: {}
      description: IContentTypeWriter
      type: object
    IRequest:
      title: IRequest
      properties: {}
      description: IRequest
      type: object
    Func_IDisposable_:
      title: Func`1
      properties: {}
      description: Func<IDisposable>
      type: object
    IDictionary_String_String_:
      title: IDictionary<String,String>
      additionalProperties:
        type: string
      description: IDictionary<String,String>
      type: object
    ResponseError:
      title: ResponseError
      properties:
        errorCode:
          type: string
        fieldName:
          type: string
        message:
          type: string
        meta:
          $ref: '#/components/schemas/Dictionary_String_String_'
      description: ResponseError
      type: object

````