How to get YouTube video transcripts via API

TL;DR

YouTube’s official Captions API lets you list caption tracks, but downloading transcript text requires OAuth 2.0 from the video owner. For public videos, most developers use third-party libraries like youtube-transcript-api (Python) that extract auto-generated captions. BrightBean’s /transcripts endpoint provides cleaned, structured transcripts with timestamps and topic segmentation.

How to get YouTube video transcripts via API

There are three approaches to getting YouTube transcripts, each with trade-offs.

Approach 1: YouTube Captions API (Official). The captions.list endpoint returns available caption tracks for a video. However, captions.download requires OAuth 2.0 authentication from the video owner. This means you can only download transcripts for channels you own or manage. For competitive research, this is a dead end.

Approach 2: Third-party libraries. The most popular option is the Python youtube-transcript-api library, which extracts auto-generated and manually uploaded captions from public videos. It works by accessing the same data that YouTube’s built-in transcript viewer uses. This approach is free but can break when YouTube changes its internal endpoints.

Approach 3: Web scraping. Some developers extract transcripts by parsing YouTube’s page data directly. This is fragile, violates YouTube’s ToS, and isn’t recommended for production use.

For AI agent workflows that need to analyze video content at scale, reliability and structure matter. Raw transcripts are messy: they lack topic segmentation, speaker identification, and timestamp alignment.

How BrightBean helps

BrightBean’s /transcripts endpoint delivers cleaned, structured transcripts that are ready for LLM consumption.

GET /transcripts?video_id=dQw4w9WgXcQ

{
  "video_id": "dQw4w9WgXcQ",
  "language": "en",
  "duration_seconds": 632,
  "segments": [
    {
      "start": 0.0,
      "end": 15.2,
      "text": "Today we're going to look at three strategies...",
      "topic": "introduction"
    },
    {
      "start": 15.2,
      "end": 142.8,
      "text": "The first strategy involves...",
      "topic": "strategy_1"
    }
  ]
}

Key takeaways

• YouTube’s official Captions API requires video owner OAuth for transcript downloads
• Third-party libraries like youtube-transcript-api can extract public transcripts
• Raw transcripts lack structure, with no topic segmentation or clean formatting
• BrightBean provides cleaned, segmented transcripts optimized for AI consumption
• Transcript data is essential for hook analysis and content gap discovery

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