{ "openapi": "3.0.1", "info": { "title": "YouTube Video Downloader — MP4/MP3, Subtitles, Bulk", "description": "Download YouTube videos & Shorts as MP4 (360p–4K) or MP3 audio — in bulk, by URL or ID. Subtitles as VTT, full metadata, shareable file links, cookies for age-restricted videos, metadata-only preview mode. 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One video is downloaded per entry.", "items": { "type": "string" } }, "quality": { "title": "Video quality", "enum": [ "360p", "480p", "720p", "1080p", "best" ], "type": "string", "description": "Maximum resolution to download. The best available stream up to this height is picked. Ignored when format is MP3.", "default": "720p" }, "format": { "title": "Output format", "enum": [ "mp4", "mp3" ], "type": "string", "description": "MP4 downloads the video; MP3 extracts audio only (smaller and cheaper — great for transcription pipelines).", "default": "mp4" }, "downloadSubtitles": { "title": "Download subtitles (VTT)", "type": "boolean", "description": "Also save the video's subtitles or auto-generated captions as a .vtt file with its own download link.", "default": false }, "subtitleLanguages": { "title": "Subtitle languages", "type": "array", "description": "Preferred subtitle language codes in priority order (e.g. en, de, es). 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Leave default unless downloads fail." }, "maxConcurrency": { "title": "Max parallel downloads", "minimum": 1, "maximum": 5, "type": "integer", "description": "How many videos to download at the same time (1–5). 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