Cloudflare Stream Captions API

openapi: 3.0.3
info:
  title: Cloudflare Stream Analytics Captions API
  description: Cloudflare Stream is the video streaming, hosting, and live-video product from Cloudflare. A single REST API uploads, stores, encodes, and delivers on-demand and live video across Cloudflare's global network, with a built-in adaptive-bitrate player, HLS/DASH manifests, live inputs over RTMPS and SRT, AI-generated and uploaded captions, signed-URL access control, per-account webhooks, and viewing analytics. All requests are scoped to an account under /accounts/{account_id}/stream and authenticate with a Bearer API token. This document grounds the core Stream endpoints; it is not exhaustive of every Cloudflare Stream operation.
  version: '1.0'
  contact:
    name: Cloudflare Stream
    url: https://developers.cloudflare.com/stream/
  license:
    name: Cloudflare Website and Online Services Terms of Use
    url: https://www.cloudflare.com/terms/
servers:
- url: https://api.cloudflare.com/client/v4
  description: Cloudflare API v4
security:
- bearerAuth: []
tags:
- name: Captions
  description: Per-language captions and subtitles for a video.
paths:
  /accounts/{account_id}/stream/{identifier}/captions:
    get:
      operationId: listCaptions
      tags:
      - Captions
      summary: List captions
      description: Lists the available caption and subtitle languages for a video.
      parameters:
      - $ref: '#/components/parameters/AccountId'
      - $ref: '#/components/parameters/Identifier'
      responses:
        '200':
          description: A list of captions.
  /accounts/{account_id}/stream/{identifier}/captions/{language}:
    get:
      operationId: getCaption
      tags:
      - Captions
      summary: Get caption details for a language
      description: Fetches the caption entry for a specific BCP 47 language tag.
      parameters:
      - $ref: '#/components/parameters/AccountId'
      - $ref: '#/components/parameters/Identifier'
      - $ref: '#/components/parameters/Language'
      responses:
        '200':
          description: The caption details.
    put:
      operationId: uploadCaption
      tags:
      - Captions
      summary: Upload captions for a language
      description: Uploads a caption or subtitle file for a language via multipart/form-data.
      parameters:
      - $ref: '#/components/parameters/AccountId'
      - $ref: '#/components/parameters/Identifier'
      - $ref: '#/components/parameters/Language'
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
      responses:
        '200':
          description: The uploaded caption.
    delete:
      operationId: deleteCaption
      tags:
      - Captions
      summary: Delete captions for a language
      description: Deletes the captions for a language from a video.
      parameters:
      - $ref: '#/components/parameters/AccountId'
      - $ref: '#/components/parameters/Identifier'
      - $ref: '#/components/parameters/Language'
      responses:
        '200':
          description: The captions were deleted.
  /accounts/{account_id}/stream/{identifier}/captions/{language}/generate:
    post:
      operationId: generateCaption
      tags:
      - Captions
      summary: Generate captions with AI
      description: Automatically generates captions for a language using AI transcription.
      parameters:
      - $ref: '#/components/parameters/AccountId'
      - $ref: '#/components/parameters/Identifier'
      - $ref: '#/components/parameters/Language'
      responses:
        '200':
          description: The generation job was accepted.
  /accounts/{account_id}/stream/{identifier}/captions/{language}/vtt:
    get:
      operationId: getCaptionVtt
      tags:
      - Captions
      summary: Get captions as WebVTT
      description: Returns the captions for a language in WebVTT format.
      parameters:
      - $ref: '#/components/parameters/AccountId'
      - $ref: '#/components/parameters/Identifier'
      - $ref: '#/components/parameters/Language'
      responses:
        '200':
          description: The WebVTT caption file.
          content:
            text/vtt:
              schema:
                type: string
components:
  parameters:
    Language:
      name: language
      in: path
      required: true
      description: The BCP 47 language tag (for example, en or tr).
      schema:
        type: string
    Identifier:
      name: identifier
      in: path
      required: true
      description: The video identifier (uid).
      schema:
        type: string
    AccountId:
      name: account_id
      in: path
      required: true
      description: The Cloudflare account identifier.
      schema:
        type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Cloudflare API token passed in an Authorization Bearer header.