ConceptNet Utilities API

openapi: 3.0.3
info:
  title: ConceptNet REST Concepts Utilities API
  description: ConceptNet is a freely available multilingual knowledge graph providing computers access to common-sense knowledge. The REST API exposes the full ConceptNet 5 knowledge graph via JSON-LD endpoints. Consumers can look up concept nodes by language and term, query edges by relation type, retrieve semantically related terms ranked by Numberbatch embedding similarity, compute pairwise relatedness scores between concepts, and normalize natural-language text into canonical ConceptNet URIs. No authentication or API key is required.
  version: '5.7'
  license:
    name: CC BY-SA 4.0
    url: https://creativecommons.org/licenses/by-sa/4.0/
  contact:
    name: ConceptNet Users Group
    url: https://groups.google.com/g/conceptnet-users
  x-website: https://conceptnet.io
  x-github: https://github.com/commonsense/conceptnet5
servers:
- url: https://api.conceptnet.io
  description: ConceptNet public API
tags:
- name: Utilities
  description: URI normalization and text standardization
paths:
  /uri:
    get:
      operationId: normalizeUri
      summary: Normalize text to a ConceptNet URI
      description: Converts a raw natural-language phrase in any supported language into a canonical ConceptNet URI. Handles tokenization, lowercasing, stopword removal, and language-specific normalization. The resulting URI can be used directly in other API endpoints. Also accessible as /normalize and /standardize.
      tags:
      - Utilities
      parameters:
      - name: text
        in: query
        description: Natural-language phrase to normalize (use "text" or "term")
        required: false
        schema:
          type: string
          example: french toast
      - name: term
        in: query
        description: Alternative parameter name for the phrase to normalize
        required: false
        schema:
          type: string
      - name: language
        in: query
        description: BCP-47 language code for the input text
        required: true
        schema:
          type: string
          example: en
      responses:
        '200':
          description: Normalized ConceptNet URI
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UriResult'
              example:
                '@id': /uri?language=en&text=french+toast
                uri: /c/en/french_toast
        '400':
          description: Missing language or text parameter
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    UriResult:
      type: object
      description: URI normalization result
      properties:
        '@id':
          type: string
          description: URI of this normalization result
        uri:
          type: string
          description: Canonical ConceptNet URI for the input text
          example: /c/en/french_toast
    Error:
      type: object
      description: API error response
      properties:
        error:
          type: string
          description: Error type identifier
        details:
          type: string
          description: Human-readable error description