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

# List Ontologies

> List all uploaded ontologies for the authenticated user.

## Response
Returns a dictionary mapping ontology keys to their metadata including filename, size, and upload timestamp.

## Error Codes
- **500 Internal Server Error**: File system or processing errors



## OpenAPI

````yaml /cognee_openapi_spec.json get /api/v1/ontologies
openapi: 3.1.0
info:
  title: Cognee API
  description: Cognee API with Bearer token and Cookie auth
  version: 1.0.0
servers:
  - url: https://api.cognee.ai
    description: Production server (full functionality)
  - url: http://localhost:8000
    description: Local development server (requires local setup)
security:
  - BearerAuth: []
  - ApiKeyAuth: []
tags:
  - name: activity
    description: ''
  - name: add
    description: Data ingestion endpoints for adding text, files, and structured data.
  - name: auth
    description: >-
      Authentication endpoints for user registration, login, and token
      management.
  - name: checks
    description: ''
  - name: cognify
    description: >-
      Knowledge processing endpoints to transform raw data into knowledge
      graphs.
  - name: configuration
    description: ''
  - name: datasets
    description: Dataset management endpoints for listing, creating, and deleting datasets.
  - name: delete
    description: Data deletion endpoints (deprecated — use datasets endpoints instead).
  - name: forget
    description: ''
  - name: health
    description: ''
  - name: improve
    description: ''
  - name: llm
    description: ''
  - name: memify
    description: ''
  - name: notebooks
    description: ''
  - name: ontologies
    description: ''
  - name: permissions
    description: Permission management for multi-user access control.
  - name: recall
    description: ''
  - name: remember
    description: ''
  - name: responses
    description: Response generation endpoints using the knowledge graph.
  - name: search
    description: Search endpoints for querying the knowledge graph.
  - name: sessions
    description: ''
  - name: settings
    description: Configuration endpoints for managing Cognee settings.
  - name: sync
    description: ''
  - name: update
    description: ''
  - name: users
    description: User management endpoints.
  - name: visualize
    description: Graph visualization endpoints.
paths:
  /api/v1/ontologies:
    get:
      tags:
        - ontologies
      summary: List Ontologies
      description: >-
        List all uploaded ontologies for the authenticated user.


        ## Response

        Returns a dictionary mapping ontology keys to their metadata including
        filename, size, and upload timestamp.


        ## Error Codes

        - **500 Internal Server Error**: File system or processing errors
      operationId: list_ontologies_api_v1_ontologies_get
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                additionalProperties: true
                type: object
                title: Response List Ontologies Api V1 Ontologies Get
      security:
        - BearerAuth: []
        - ApiKeyAuth: []
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-Api-Key

````