> ## Documentation Index > Fetch the complete documentation index at: https://docs.agentbody.io/llms.txt > Use this file to discover all available pages before exploring further. # Download a YouTube video as MP4 > Use this operation to save one public YouTube video as an MP4 file link (up to 720p) with normalized video metadata. ## OpenAPI ````yaml /api-reference/openapi.json post /v1/youtube/video/download openapi: 3.1.0 info: description: >- Direct authenticated APIs for public social data, people data, transcripts, documents, text, and SEO. Send an API key as a Bearer token. Responses never include provider credentials or raw provider payloads. license: name: Proprietary url: https://agentbody.io title: AgentBody API version: '2026-09-15' servers: - url: https://api.agentbody.io security: - bearerAuth: [] paths: /v1/youtube/video/download: post: tags: - youtube summary: Download a YouTube video as MP4 description: >- Use this operation to save one public YouTube video as an MP4 file link (up to 720p) with normalized video metadata. operationId: post_v1_youtube_video_download parameters: - $ref: '#/components/parameters/IdempotencyKey' requestBody: content: application/json: schema: $ref: '#/components/schemas/YouTubeVideoDownloadRequest' required: true responses: '200': $ref: '#/components/responses/YouTubeVideoDownloadSuccess' '400': content: application/json: example: error: code: INVALID_ARGUMENT message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: INVALID_ARGUMENT type: string message: type: string required: - code - message type: object required: - error type: object description: Correct the input; do not retry unchanged. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '401': content: application/json: example: error: code: UNAUTHENTICATED message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UNAUTHENTICATED type: string message: type: string required: - code - message type: object required: - error type: object description: Configure a valid API key; do not retry unchanged. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '409': content: application/json: example: error: code: CONFLICT message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: CONFLICT type: string message: type: string required: - code - message type: object required: - error type: object description: Follow the documented Idempotency-Key behavior before retrying. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '502': content: application/json: example: error: code: UPSTREAM_INVALID_RESPONSE message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UPSTREAM_INVALID_RESPONSE type: string message: type: string required: - code - message type: object required: - error type: object description: Retry with backoff, then report temporary unavailability. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '503': content: application/json: example: error: code: UPSTREAM_UNAVAILABLE message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UPSTREAM_UNAVAILABLE type: string message: type: string required: - code - message type: object required: - error type: object description: Retry with backoff, then report temporary unavailability. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '504': content: application/json: example: error: code: UPSTREAM_TIMEOUT message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UPSTREAM_TIMEOUT type: string message: type: string required: - code - message type: object required: - error type: object description: Retry with backoff, then report temporary unavailability. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string components: parameters: IdempotencyKey: description: Optional key for safely retrying a billable write request. example: request-20260819-001 in: header name: Idempotency-Key required: false schema: maxLength: 255 minLength: 1 type: string schemas: YouTubeVideoDownloadRequest: additionalProperties: false properties: quality: default: 720p enum: - 144p - 240p - 360p - 480p - 720p type: string url: format: uri type: string required: - url type: object YouTubeVideoDownloadResult: additionalProperties: false properties: duration_seconds: type: number format: type: string quality: type: string size_mb: type: number title: type: string url: format: uri type: string video_content_type: type: string video_id: type: string video_url: format: uri type: string required: - video_id - url - video_url - video_content_type - format - quality type: object responses: YouTubeVideoDownloadSuccess: content: application/json: example: duration_seconds: 180 format: mp4 quality: 720p size_mb: 15.2 title: Example Video url: https://www.youtube.com/watch?v=dQw4w9WgXcQ video_content_type: video/mp4 video_id: dQw4w9WgXcQ video_url: >- https://api.apify.com/v2/key-value-stores/example/records/dQw4w9WgXcQ.mp4 schema: $ref: '#/components/schemas/YouTubeVideoDownloadResult' description: Downloaded YouTube media link and normalized public video metadata. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string securitySchemes: bearerAuth: scheme: bearer type: http ````